Journal of Alloys and Compounds最新文献

{"title":"Investigation of magnetic ordering in antisite-disordered Ga1-xAlxFeO3 by Ferromagnetic resonance and 57Fe Mössbauer spectroscopy","authors":"Saarthak Dulgaj, Mohd Aamir Khan, Saurabh Gupta, G A Basheed, V R Reddy, S.N. Kaul, S. Srinath","doi":"10.1016/j.jallcom.2026.190764","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190764","url":null,"abstract":"The nature of magnetic ordering in Ga<ce:inf loc=\"post\">1-x</ce:inf>Al<ce:inf loc=\"post\">x</ce:inf>FeO<ce:inf loc=\"post\">3</ce:inf> (0 ≤ x ≤ 0.3) is studied using temperature-dependent ferromagnetic resonance (FMR) and ‘zero-field’ and ‘in-field’ <ce:sup loc=\"post\">57</ce:sup>Fe Mössbauer spectroscopy (ME). FMR spectra taken at temperatures between 100 and 295<ce:hsp sp=\"0.25\"></ce:hsp>K revealed four resonance modes below the magnetic ordering temperature: two antiferromagnetically coupled modes whose resonance fields increased on cooling, one ferromagnetically coupled mode whose resonance field decreased with temperature, and a temperature-independent mode at ~3.4<ce:hsp sp=\"0.25\"></ce:hsp>kOe associated with the feebly magnetic Ga1 site. Al substitution shifts the onset of these modes to higher temperatures, consistent with an increase in the Néel temperature from ~208<ce:hsp sp=\"0.25\"></ce:hsp>K (x = 0) to ~240<ce:hsp sp=\"0.25\"></ce:hsp>K (x = 0.3). A detailed analysis of temperature-, field- and composition- dependent Mössbauer spectroscopy data confirmed the presence of high-spin Fe<ce:sup loc=\"post\">3+</ce:sup> ions, with room-temperature spectra showing four quadrupole doublets from the octahedral Fe1, Fe2, Ga2 and tetrahedral Ga1 sites. The low-temperature in-field Mössbauer spectra revealed that the Fe site occupancy varies as Fe1 &gt; Fe2 &gt; Ga2 &gt; &gt; Ga1 and the individual site occupancy remains constant throughout the Al substitution. The variation of the hyperfine field under the application of a 50<ce:hsp sp=\"0.25\"></ce:hsp>kOe field confirms the ferrimagnetic ordering of Fe<ce:sup loc=\"post\">3+</ce:sup> moments for all x.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"43 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of alumina sol-coated sintering aids on the densification behavior and properties of (TiNbTaV)C high-entropy carbide ceramics","authors":"Chengpeng Cai, Yike Sun, Saisai Li, Shuquan Chang, Ruoyu Chen, Minghui Li, Wenbao Jia","doi":"10.1016/j.jallcom.2026.190853","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190853","url":null,"abstract":"This study investigated the effect of alumina sol coating on the densification behavior and properties of (TiNbTaV)C high-entropy carbide ceramics prepared by spark plasma sintering. Compared with direct powder mixing, alumina sol coating enabled a more homogeneous distribution of Al<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf> on HEC powder surfaces. Among the investigated conditions, the 20<ce:hsp sp=\"0.25\"></ce:hsp>wt.% alumina sol-coated (S20) powder exhibited the most uniform Al distribution, reduced agglomeration, and improved powder characteristics. During sintering, uniformly distributed alumina promoted liquid-phase-assisted densification by enhancing interparticle contact, interfacial mass transport, and pore elimination. Increasing the sintering temperature improved densification, whereas interfacial reactions at 1900 ℃ formed Al<ce:inf loc=\"post\">2</ce:inf>TiO<ce:inf loc=\"post\">5</ce:inf> and slightly degraded mechanical properties. The sample prepared with 20<ce:hsp sp=\"0.25\"></ce:hsp>wt.% alumina sol and sintered at 1800 ℃ showed the best mechanical performance. It also exhibited enhanced thermal conductivity and reduced simulated He accumulation and irradiation damage, demonstrating the effectiveness of alumina sol coating for optimizing HEC ceramics.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"17 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of WS2 on microstructural characteristics and corrosion behavior of Ni-W and Ni–W/CrN composite coating electrodeposited continuously from a dilute citrate-based electrolyte","authors":"Baosong Li, Weiwei Zhang, Yingjie Liu, Zhenghong Xu, Yanjie Wang, Bo Chen","doi":"10.1016/j.jallcom.2026.190806","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190806","url":null,"abstract":"Ni–W/WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; and Ni–W/CrN–WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; composite coatings were fabricated via continuous electrodeposition from a dilute citrate-based electrolyte containing varying concentrations of WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; nanoparticles. The influences of WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; content on the surface morphology, elemental composition, phase structure, surface roughness, chemical valence states and corrosion behavior were systematically explored. The results demonstrate that the incorporation of WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; nanoparticles refines the grain structure, reduces surface roughness, suppresses particle agglomeration, and promotes the formation of a denser and more homogeneous microstructure. When the concentration of WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; exceeds 8&lt;ce:hsp sp=\"0.25\"&gt;&lt;/ce:hsp&gt;g&lt;ce:hsp sp=\"0.25\"&gt;&lt;/ce:hsp&gt;L&lt;ce:sup loc=\"post\"&gt;-1&lt;/ce:sup&gt;, WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; particles induce agglomeration and increase internal defects within the coating, thereby impairing its structural compactness and corrosion resistance. XRD and XPS analyses confirm that CrN and WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; are successfully co-deposited into Ni–W coating without changing the primary chemical states of Ni, W, Cr, N and S. AFM measurements reveal that 6&lt;ce:hsp sp=\"0.25\"&gt;&lt;/ce:hsp&gt;g&lt;ce:hsp sp=\"0.25\"&gt;&lt;/ce:hsp&gt;L&lt;ce:sup loc=\"post\"&gt;-1&lt;/ce:sup&gt; WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; effectively reduces the surface roughness, which is beneficial to the improvement of tribological properties. EIS results demonstrate that 1&lt;ce:hsp sp=\"0.25\"&gt;&lt;/ce:hsp&gt;g·L&lt;ce:sup loc=\"post\"&gt;-1&lt;/ce:sup&gt; WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; significantly enhances the anti-corrosion property of Ni–W/WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; deposit with the highest &lt;ce:italic&gt;R&lt;/ce:italic&gt;&lt;ce:inf loc=\"post\"&gt;p&lt;/ce:inf&gt; 123.78 kΩ·cm&lt;ce:sup loc=\"post\"&gt;2&lt;/ce:sup&gt; (&lt;ce:italic&gt;R&lt;/ce:italic&gt;&lt;ce:inf loc=\"post\"&gt;&lt;ce:italic&gt;c&lt;/ce:italic&gt;&lt;/ce:inf&gt; 64.47 plus &lt;ce:italic&gt;R&lt;/ce:italic&gt;&lt;ce:inf loc=\"post\"&gt;&lt;ce:italic&gt;ct&lt;/ce:italic&gt;&lt;/ce:inf&gt; 59.21 kΩ·cm&lt;ce:sup loc=\"post\"&gt;2&lt;/ce:sup&gt;), forming a reliable physical barrier against corrosive media. In contrast, for the dual-particle synergistic strengthening phase of CrN–WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt;, the anti-corrosion property of Ni–W/CrN–WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; coating is gradually improved as the addition amount of WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; increases, reaching the optimal performance at 8&lt;ce:hsp sp=\"0.25\"&gt;&lt;/ce:hsp&gt;g·L&lt;ce:sup loc=\"post\"&gt;-1&lt;/ce:sup&gt;. The corrosion resistance of the Ni–W/CrN–WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; coating improves as the WS₂ concentration rises, peaking when the WS₂ concentration is 8&lt;ce:hsp sp=\"0.25\"&gt;&lt;/ce:hsp&gt;g·L⁻¹. The synergistic effect of CrN ceramic particles and WS&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt; solid lubricant optimizes the microstructure and anti-corrosion performance of Ni–W composite coatings. These composite coatings demonstrate significant potential as corrosion-protective coati","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"78 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coupling phase-selective dealloying with heat treatment to tailor FCC + Laves porous eutectic high-entropy alloys for enhanced oxygen evolution in alkaline media","authors":"Yangchuan Cai, Yuxin Feng, Yan Cui, Sunusi Marwana Manladan, Lisong Zhu","doi":"10.1016/j.jallcom.2026.190860","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190860","url":null,"abstract":"Renewable-electricity-driven water electrolysis is a promising route to sustainable hydrogen production, but its efficiency remains constrained by sluggish oxygen evolution reaction (OER) kinetics and by the need to maintain efficient mass transport and structural integrity at high current density. Here, precursor heat treatment is coupled with phase-selective dealloying to construct self-supported porous eutectic high-entropy alloy (EHEA) electrodes with tunable pore–ligament architectures. Four Co–Cr–Fe–Ni–X–Nb (X = Al, Mo, V) EHEAs were screened, and the dealloyed Co<ce:inf loc=\"post\">16.4</ce:inf>Cr<ce:inf loc=\"post\">19.7</ce:inf>Fe<ce:inf loc=\"post\">16.4</ce:inf>Ni<ce:inf loc=\"post\">32.9</ce:inf>V<ce:inf loc=\"post\">3.4</ce:inf>Nb<ce:inf loc=\"post\">11.2</ce:inf> electrode showed the best three-electrode OER performance, requiring overpotentials of 256, 268, and 281<ce:hsp sp=\"0.25\"></ce:hsp>mV at 50, 100, and 200<ce:hsp sp=\"0.25\"></ce:hsp>mA<ce:hsp sp=\"0.25\"></ce:hsp>cm⁻², respectively, with a Tafel slope of 39.8<ce:hsp sp=\"0.25\"></ce:hsp>mV dec⁻¹. Heat treatment at 1100 °C systematically coarsened the precursor eutectic structure and the inherited porous framework. Although the untreated electrode retained the highest apparent half-cell activity, the HT-50 h-derived electrode exhibited the best zero-gap alkaline-electrolyzer performance, operating at 500<ce:hsp sp=\"0.25\"></ce:hsp>mA<ce:hsp sp=\"0.25\"></ce:hsp>cm⁻² with an average cell voltage of 1.855<ce:hsp sp=\"0.25\"></ce:hsp>V over 120<ce:hsp sp=\"0.25\"></ce:hsp>h. Post-operation SEM/EDS, FIB-TEM/STEM-EDS, XRD, XPS, and Raman analyses indicate surface-localized oxygen-containing reconstruction while the underlying porous metallic/intermetallic framework remains broadly preserved. These results establish a direct precursor-structure-performance relationship and show that heat-treatment-controlled pore-scale engineering can balance catalytic accessibility, electrolyte and gas transport, and framework stability in EHEA-derived electrodes for alkaline water electrolysis.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"12 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sequential Oxygen-Vacancy Engineering and Ru Modification of NiFe-LDH for Alkaline Oxygen Evolution","authors":"Yeheng Zhang, Yinhua Jiang, Yuqiao Wang","doi":"10.1016/j.jallcom.2026.190789","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190789","url":null,"abstract":"The development of highly active and robust electrocatalysts for the oxygen evolution reaction (OER) remains pivotal to enhancing the efficiency of industrial alkaline water electrolysis. In this work, a self-supported NiFe-LDH-O<ce:inf loc=\"post\">v</ce:inf>-Ru electrode was fabricated by subjecting NiFe layered double hydroxide to sequential NaBH<ce:inf loc=\"post\">4</ce:inf> treatment and Ru electrodeposition. Comprehensive XPS and EPR analyses demonstrate a enriched defect structure induced by NaBH<ce:inf loc=\"post\">4</ce:inf> reduction, while spectroscopic and theoretical studies indicate a tailoring of the local electronic environment via Ru integration. Post-catalytic XRD, Raman, and TEM evaluations substantiate a partial structural evolution toward NiOOH-related phases under operational conditions. Under standard three-electrode conditions, NiFe-LDH-O<ce:inf loc=\"post\">v</ce:inf>-Ru exhibits an overpotential of 199<ce:hsp sp=\"0.25\"></ce:hsp>mV at 10<ce:hsp sp=\"0.25\"></ce:hsp>mA<ce:hsp sp=\"0.25\"></ce:hsp>cm<ce:sup loc=\"post\">-2</ce:sup> along with a Tafel slope of 25.5<ce:hsp sp=\"0.25\"></ce:hsp>mV dec<ce:sup loc=\"post\">-1</ce:sup>. When integrated into a two-electrode electrolyzer with a Pt/C counter electrode, the system requires 1.88<ce:hsp sp=\"0.25\"></ce:hsp>V to drive 500<ce:hsp sp=\"0.25\"></ce:hsp>mA<ce:hsp sp=\"0.25\"></ce:hsp>cm<ce:sup loc=\"post\">-2</ce:sup> and demonstrates uninterrupted operation at 500<ce:hsp sp=\"0.25\"></ce:hsp>mA<ce:hsp sp=\"0.25\"></ce:hsp>cm<ce:sup loc=\"post\">-2</ce:sup> over 500<ce:hsp sp=\"0.25\"></ce:hsp>h. These findings illustrate that integrated defect engineering and Ru modification effectively improve the geometric OER performance of NiFe-LDH systems, though the distinct atomic configuration of Ru species and the standalone mechanisms of each modification merit further exploration.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"18 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanism of enhanced and tunable long persistent luminescence in Sm3+ induced and Ce/Eu co-doped glasses","authors":"Yanbo Li, Xingzhen Huang, Yongmin Duan, Jin Zhang, Xuchang Liu, Junjie Zhang","doi":"10.1016/j.jallcom.2026.190826","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190826","url":null,"abstract":"Rare earth ions can act not only as luminescent centers but also as effective regulators for improving long persistent luminescence (LPL) performance in glass systems by modulating the local network environment and trap state distribution. In this work, Sm<ce:sup loc=\"post\">3+</ce:sup> induced Ce/Eu co-doped transparent borosilicate glasses were prepared by a high temperature melting method. Sm<ce:sup loc=\"post\">3+</ce:sup> incorporation effectively enhanced the Ce/Eu related long persistent emission after excitation with 365<ce:hsp sp=\"0.25\"></ce:hsp>nm ultraviolet light. Mechanistic investigations indicate that Sm<ce:sup loc=\"post\">3+</ce:sup> optimizes the trap state distribution by regulating the local glass network structure and oxygen related defect environment, thereby increasing the trap concentration and trap depth and ultimately enhancing LPL intensity and prolonging LPL duration. In addition, the persistent emission color can be tuned from blue and cyan to green by adjusting the Ce/Eu co-doping concentrations, accompanied by energy transfer from Ce<ce:sup loc=\"post\">3+</ce:sup> to Eu<ce:sup loc=\"post\">2+</ce:sup>. This study achieves the integration of enhanced LPL performance and persistent emission color regulation in a transparent glass system, demonstrating potential application prospects in optical anticounterfeiting, information encryption, and optical information storage.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"491 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced Hot Corrosion Resistance of a Novel Nitrogen-containing Nickel-based Alloy in Sulfate-Chloride-Vanadate Melts at 800 °C","authors":"Zhixin Yang, Guocheng Zhao, Jiaqing You, Guiqing Zhang, Shuo Feng, Taisen Yang, Xuewei Liang, Yunhai Su","doi":"10.1016/j.jallcom.2026.190793","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190793","url":null,"abstract":"Nickel-based alloys are prone to hot-corrosion degradation in aggressive high-temperature environments, which severely limits their long-term reliability in surface repair and protection applications. In this study, a nitrogen-containing nickel-based alloy coating (HN-Ni) was designed and fabricated on Q235 steel by plasma cladding, with commercial Inconel 625 used as a reference material. The hot-corrosion behaviour of the two coatings was comparatively investigated in Na<ce:inf loc=\"post\">2</ce:inf>SO<ce:inf loc=\"post\">4</ce:inf>-NaCl and Na<ce:inf loc=\"post\">2</ce:inf>SO<ce:inf loc=\"post\">4</ce:inf>-NaCl–NaVO<ce:inf loc=\"post\">3</ce:inf> molten salts. The corrosion kinetics and degradation mechanisms were evaluated by mass-loss measurements per unit area, X-ray diffraction, scanning electron microscopy, electron backscatter diffraction and X-ray photoelectron spectroscopy. In the Na<ce:inf loc=\"post\">2</ce:inf>SO<ce:inf loc=\"post\">4</ce:inf>–NaCl salt, the mass loss of HN-Ni was only 43.5% of that of Inconel 625, while in the more aggressive Na<ce:inf loc=\"post\">2</ce:inf>SO<ce:inf loc=\"post\">4</ce:inf>–NaCl–NaVO₃ salt, it further decreased to 34.1% of the value measured for Inconel 625. The corrosion kinetics followed a parabolic rate law, and the much lower parabolic rate constant of HN-Ni indicated a stronger diffusion-barrier effect of its corrosion product layer. Microstructural and surface-chemical analyses revealed that HN-Ni developed a thinner and more compact corrosion scale, consisting predominantly of protective Cr<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf>, together with a continuous inner Al<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf> layer that effectively suppressed the inward penetration of corrosive species. By contrast, Inconel 625 formed a loose and porous NiO-dominated scale, accompanied by a deeper Cr-depleted zone and more severe internal corrosion. The superior hot-corrosion resistance of HN-Ni is attributed to the nitrogen-induced “Cr-fixing effect”, which promotes the formation and stabilization of a dense Cr-rich oxide scale, while the relatively high Al content facilitates the development of an inner alumina barrier. These two protective features establish an effective Cr<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf>/Al<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf> composite scale. Although the addition of vanadate intensified the corrosivity of the molten salt, HN-Ni retained significantly enhanced resistance, demonstrating its potential as a low-cost coating material for high-temperature repair applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"44 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Photoluminescence and thermoluminescence properties of ZnTiO3: Er3+, Yb3+ enhanced by incorporating Al3+","authors":"EN Njeru, SJ Mofokeng, D Oeba, MS Dhlamini, LL Noto","doi":"10.1016/j.jallcom.2026.190759","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190759","url":null,"abstract":"The solid-state chemical reaction synthesis method was effectively used to synthesize ZnTiO<ce:inf loc=\"post\">3</ce:inf>: 0.8<ce:hsp sp=\"0.25\"></ce:hsp>mol%Er<ce:sup loc=\"post\">3+</ce:sup>, 0.7<ce:hsp sp=\"0.25\"></ce:hsp>mol%Yb<ce:sup loc=\"post\">3+</ce:sup> (ZnTiO<ce:inf loc=\"post\">3</ce:inf>: Er<ce:sup loc=\"post\">3+</ce:sup>, Yb<ce:sup loc=\"post\">3+</ce:sup>), which was co-doped with various amounts of Al<ce:sup loc=\"post\">3+</ce:sup> mole percentages (x mol% Al<ce:sup loc=\"post\">3+</ce:sup>) at 800<ce:hsp sp=\"0.25\"></ce:hsp><ce:sup loc=\"post\">o</ce:sup>C. X-ray diffraction (XRD) patterns confirmed a trigonal phase formation with R<mml:math altimg=\"si0001.gif\"><mml:mover accent=\"true\"><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mo>̅</mml:mo></mml:mover></mml:math> space group. The Williamson-Hall (W-H) relation was used to confirm the strain induced by Al<ce:sup loc=\"post\">3+</ce:sup> co-doping. The surface morphology showing irregular particles that are agglomerated was obtained by scanning electron microscopy (SEM), and inhomogeneous distribution of the dopant ions was determined by energy dispersive X-ray spectroscopy (EDS). The photoluminescence (PL) spectroscopy confirmed the up-conversion emission around 528<ce:hsp sp=\"0.25\"></ce:hsp>nm, 550<ce:hsp sp=\"0.25\"></ce:hsp>nm and 659 - 700<ce:hsp sp=\"0.25\"></ce:hsp>nm from <ce:sup loc=\"post\">2</ce:sup>H<ce:inf loc=\"post\">11/2</ce:inf> → <ce:sup loc=\"post\">4</ce:sup>I<ce:inf loc=\"post\">15/2</ce:inf>, <ce:sup loc=\"post\">4</ce:sup>S<ce:inf loc=\"post\">3/2</ce:inf> → <ce:sup loc=\"post\">4</ce:sup>I<ce:inf loc=\"post\">15/2</ce:inf> and <ce:sup loc=\"post\">4</ce:sup>F<ce:inf loc=\"post\">9/2</ce:inf> → <ce:sup loc=\"post\">4</ce:sup>I<ce:inf loc=\"post\">15/2</ce:inf> electron transitions of Er<ce:sup loc=\"post\">3+</ce:sup>, respectively. The PL measurements confirmed that 0.6<ce:hsp sp=\"0.25\"></ce:hsp>mol% Al<ce:sup loc=\"post\">3+</ce:sup> co-doping in ZnTiO<ce:inf loc=\"post\">3</ce:inf>: Er<ce:sup loc=\"post\">3+</ce:sup>, Yb<ce:sup loc=\"post\">3+</ce:sup> yielded the optimal luminescence emission intensity. The thermoluminescence (TL) glow curves were used to trace the electron trapping centres and determine the electron activation energies, which were approximated to 0.73 ± 0.05<ce:hsp sp=\"0.25\"></ce:hsp>eV and 0.89 ± 0.08<ce:hsp sp=\"0.25\"></ce:hsp>eV. This study confirmed that Al<ce:sup loc=\"post\">3+</ce:sup> incorporation in ZnTiO<ce:inf loc=\"post\">3</ce:inf>: Er, Yb enhances the photoluminescence intensity as well as assist in quenching the deeper electron trapping centres.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"135 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148884107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simultaneous improvement of ignition resistance and mechanical properties of Mg-Nd-Gd-xY-Zn-Zr alloys: oxide layer evolution and precipitation strengthening","authors":"Xin Guo, Yadong Huang, Jiangfeng Song, Zhihua Dong, Yuyang Gao, Wenlong Xie, Chunyu Li, Jinge Liao, Bin Jiang","doi":"10.1016/j.jallcom.2026.190864","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190864","url":null,"abstract":"The growing use of cast magnesium rare-earth alloys in aerospace and new energy vehicle applications demands Mg alloys with both high ignition resistance and mechanical strength. In this work, the effects of Y addition and heat treatment on the microstructural evolution, oxidation behavior, ignition resistance, and mechanical properties of Mg-3Nd-1Gd-0.5Zn-0.5Zr alloy were systematically investigated. Y addition markedly enhanced ignition resistance, increasing the average ignition temperature from 716 ℃ for the Y-free alloy to 1021 ℃ for the alloy containing 2<ce:hsp sp=\"0.25\"></ce:hsp>wt.% Y. This improvement was primarily attributed to the formation of a dense Y<ce:inf loc=\"post\">2</ce:inf>O<ce:inf loc=\"post\">3</ce:inf>-dominated oxide layer with enhanced compactness, crack resistance, and compressive residual stress. Heat treatment further improved ignition resistance by modifying oxide evolution. Solution treatment promoted a more uniform distribution of ignition resistance elements and facilitated the formation of thicker and more homogeneous oxide layers. After aging treatment, nanoscale precipitates may be incorporated into the growing oxide layer and promoted the formation of stable rare-earth rich interfacial phases. As a result, the ignition temperature of the 2<ce:hsp sp=\"0.25\"></ce:hsp>wt.% Y alloy increased to 1043 ℃ after T6 treatment. Simultaneously, Y addition enhanced precipitation strengthening during aging, resulting in a yield strength of 194<ce:hsp sp=\"0.25\"></ce:hsp>MPa, an ultimate tensile strength of 334<ce:hsp sp=\"0.25\"></ce:hsp>MPa, and an elongation of 9.4%. The results reveal a coupling between oxide layer evolution and precipitation strengthening, providing an effective strategy for achieving high ignition resistance and superior mechanical performance in low rare-earth cast magnesium alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"22 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pre-twinning-directed hierarchical grain refinement for exceptional strength–ductility synergy in pure copper","authors":"M.R. Sabour, E. Taherkhani, H. Rahimi, A. Jalali Aghchai, G. Faraji","doi":"10.1016/j.jallcom.2026.190868","DOIUrl":"https://doi.org/10.1016/j.jallcom.2026.190868","url":null,"abstract":"Simultaneously achieving high strength and tensile ductility in pure copper remains a major challenge because conventional severe plastic deformation generally refines the microstructure without controlling the structural features that govern subsequent deformation. In particular, the potential of pre-engineered deformation twins as structural elements for tailoring microstructural evolution has received little attention. In this study, high-purity copper was first processed by hydrostatic twist extrusion (HTE) to generate a gradient pre-twinned microstructure, which was subsequently subjected to caliber rolling (CR). The pre-existing deformation twins were found to play a decisive role in the subsequent refinement process. Optical microscopy, STEM, and TEM observations revealed that thick twins remained relatively stable, whereas progressively refined twins became preferential sites for dislocation accumulation, boundary evolution, and eventual fragmentation into ultrafine grains, producing a heterogeneous surface layer while preserving a hierarchically twinned interior. This microstructural design strategy resulted in a hierarchical gradient structure that achieved an ultimate tensile strength of 589<ce:hsp sp=\"0.25\"></ce:hsp>MPa together with a 15.7% uniform elongation, demonstrating an outstanding strength–ductility synergy. The present work demonstrates that pre-twinning provides an effective strategy for directing subsequent grain refinement and designing high-performance heterogeneous copper.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"43 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2026-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148883616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}