Journal of Alloys and Compounds最新文献

{"title":"Experimental study of a new Heusler compound which contains molybdenum - Ti2MoAl","authors":"Jerzy Goraus, Wojciech Gumulak, Jerzy Kubacki, Magdalena Szubka, Monika Oboz, Joanna Klimontko, Marcin Fijałkowski, Ondrej Zivotsky, Bogdan Sawicki, Tomasz Sobol, Edyta Beyer","doi":"10.1016/j.jallcom.2025.180901","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180901","url":null,"abstract":"Heusler alloys have been extensively studied, however, very little is known about such compounds which contain molybdenum at one of the Wyckoff sites, and not as a substituting or doping element. There is almost no experimental studies of such systems. We decided to study a Ti<span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub is=\"true\"><mrow is=\"true\" /><mrow is=\"true\"><mn is=\"true\">2</mn></mrow></msub></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"1.509ex\" role=\"img\" style=\"vertical-align: -0.582ex;\" viewbox=\"0 -399.4 453.9 649.8\" width=\"1.054ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"></g><g is=\"true\" transform=\"translate(0,-150)\"><g is=\"true\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-32\"></use></g></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub is=\"true\"><mrow is=\"true\"></mrow><mrow is=\"true\"><mn is=\"true\">2</mn></mrow></msub></math></span></span><script type=\"math/mml\"><math><msub is=\"true\"><mrow is=\"true\"></mrow><mrow is=\"true\"><mn is=\"true\">2</mn></mrow></msub></math></script></span>CrAl analogue, where Cr was substituted by its heavier cousin in the periodic table, Mo. We successfully synthesized the sample, and thoroughly investigated it with several experimental techniques. The magnetic susceptibility shows, that it is a paramagnetic metal, similar to Ti<span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub is=\"true\"><mrow is=\"true\" /><mrow is=\"true\"><mn is=\"true\">2</mn></mrow></msub></math>' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"><svg aria-hidden=\"true\" focusable=\"false\" height=\"1.509ex\" role=\"img\" style=\"vertical-align: -0.582ex;\" viewbox=\"0 -399.4 453.9 649.8\" width=\"1.054ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"><g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"><g is=\"true\"><g is=\"true\"></g><g is=\"true\" transform=\"translate(0,-150)\"><g is=\"true\"><use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-32\"></use></g></g></g></g></svg><span role=\"presentation\"><math xmlns=\"http://www.w3.org/1998/Math/MathML\"><msub is=\"true\"><mrow is=\"true\"></mrow><mrow is=\"true\"><mn is=\"true\">2</mn></mrow></msub></math></span></span><script type=\"math/mml\"><math><msub is=\"true\"><mrow is=\"true\"></mrow><mrow is=\"true\"><mn is=\"true\">2</mn></mrow></msub></math></script></span>CrAl with a moderate thermopower of 15 <span><span style=\"\"></span><span data-mathml='<math xmlns=\"http://www.w3.org/1998/Math/MathML\"><mi is=\"true\">μ</mi></ma","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"172 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145806","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":"Experimental investigation on the role of Bi³⁺ composition in structural, elastic, and radiation shielding properties of multifunctional cobalt-nickel nanoferrites","authors":"Manjunatha ,&nbsp;Shrikant Biradar ,&nbsp;A.S. Bennal ,&nbsp;Smita Patil ,&nbsp;M.I. Sayyed ,&nbsp;Yuvarajgouda N. Patil ,&nbsp;Manjunath B. Megalamani ,&nbsp;Balachandra G. Hegde","doi":"10.1016/j.jallcom.2025.181255","DOIUrl":"10.1016/j.jallcom.2025.181255","url":null,"abstract":"<div><div>The growing demand for effective radiation shielding materials has led to the exploration of alternative options to conventional materials, such as lead (Pb), which are heavy, toxic, and expensive. In this study, bismuth-doped nickel cobalt nanoferrites (Ni_0.5Co_0.5Bi_xFe_2-xO₄, with x = 00, 0.05, 0.10, 0.15, and 0.2 %) were synthesised via the solution combustion method. The effect of Bi composition in XRD analysis revealed a single-phase cubic spinel structure for low Bi compositions (x ≤ 0.05) and a dual-phase structure with α-Bi₂O₃ at higher doping levels (x ≥ 0.1). FTIR spectroscopy identified vibrational modes and band shifts attributed to lattice strain induced by Bi doping. The elastic properties, such as bulk modulus (B), rigidity modulus (G), Young’s modulus (Y), and Poisson’s ratio (σ) of the developed nanoferrites were studied with varying Bi composition. Young’s modulus showed a gradual variation between 195.26 GPa to 191.39 GPa, further supporting the idea of reduced elastic stiffness with increasing Bi composition. Additionally, the radiation shielding performance of these nanoferrites was experimentally evaluated using a NaI(Tl) detector and gamma sources (¹³³Ba, ¹³⁷Cs, ²²Na, and ⁶⁰Co). The mass attenuation coefficients, linear attenuation coefficients, half-value layer, tenth-value layer, mean free path, effective atomic number, and fast neutron removal cross-sections were computed using Phy-X/PSD software for various gamma energies. Experimental mass attenuation coefficients of nanoferrites (NCBFO-00 to NCBFO-0.20) increased from 0.0759 to 0.0797 cm²/g at 0.662 MeV. Among all the samples, the highest Bi-doped nanoferrites (NCBFO-0.20) demonstrated superior radiation shielding performance, making it a promising candidate for radiation protection applications.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1033 ","pages":"Article 181255"},"PeriodicalIF":5.8,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154083","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 HfC nanoparticles on the microstructure and mechanical properties of Cu-5W alloys","authors":"Ziyan Chang ,&nbsp;Ke Jing ,&nbsp;Bingbing Shang ,&nbsp;Meng Zhou ,&nbsp;Yi Zhang ,&nbsp;Baohong Tian ,&nbsp;Jiacan Zhang ,&nbsp;Bo Yang ,&nbsp;Xin Chen ,&nbsp;Chunhe Chu ,&nbsp;Yuxin He","doi":"10.1016/j.jallcom.2025.181249","DOIUrl":"10.1016/j.jallcom.2025.181249","url":null,"abstract":"<div><div>Copper alloys are promising candidates for future fusion reactor heat sink materials due to their exceptional thermal conductivity and strength. However, improving strength while maintaining high thermal conductivity remains a key challenge. To address this issue, nanoparticle-reinforced Cu-5W and Cu-5W-0.5HfC alloys were fabricated by ball milling and fast hot pressing (FHP), and their microstructure and properties were subsequently analyzed. The results indicate that the yield strength of the Cu-5W-0.5HfC alloy increases by 65 %, reaching 256 MPa, compared to Cu-5W, while maintaining a similar elongation (∼18 %). Both Cu-5W and Cu-5W-0.5HfC exhibit electrical conductivities greater than 91 %, and their thermal conductivities at room temperature exceed 340 Wm⁻¹K⁻¹ . The nano HfC particles can purify the grain boundaries, further refine the grains, and significantly enhance the alloy's strength. This study demonstrates the potential of nano-HfC reinforced Cu-W alloys to synergistically improve strength, ductility, and thermal conductivity for advanced applications.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1033 ","pages":"Article 181249"},"PeriodicalIF":5.8,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153789","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":"Polymeric carbon nitride supported single-phase Ni with exceptional catalytic effect on MgH2 for hydrogen storage","authors":"Xinyu Liu, Xixi Meng, Tao Zhong, Yuxin Wang, Fuying Wu, Hu Liu, Hong Li, Liuting Zhang","doi":"10.1016/j.jallcom.2025.181259","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181259","url":null,"abstract":"Magnesium hydride (MgH₂) with its high hydrogen storage capacity (7.6<!-- --> <!-- -->wt%) and exceptional reversibility, has emerged as a promising solid-state hydrogen storage material. This study designed a polymeric carbon nitride (PCN) supported single-phase Ni catalyst with superior thermal stability and catalytic activity. The optimized PCN-Ni catalyst significantly reduced the initial dehydrogenation temperature of MgH₂ to 192 ºC. At 295 ºC, the composite released 6.10<!-- --> <!-- -->wt% H₂ within 5<!-- --> <!-- -->min, and it subsequently absorbed 5.50<!-- --> <!-- -->wt% H₂ within 5<!-- --> <!-- -->min at 150 ºC. Compared to pristine MgH₂, the activation energies for dehydrogenation and hydrogen absorption were reduced by 31.6% and 29.4%, respectively. Moreover, the MgH₂ + 10<!-- --> <!-- -->wt% PCN-Ni composite exhibited remarkable cycling stability, with capacity retention rates of 96.0% and 96.7% after 20 hydrogenation/dehydrogenation cycles. In conclusion, this work provides a new perspective on the heterogeneous synergy of transition metal and carbon nitride composite catalysts in promoting the dehydrogenation/rehydrogenation reactions of MgH₂ and lays the foundation for the design and fabrication of highly efficient catalysts in other energy storage related fields.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"23 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153791","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":"Improved Leachability of CaO Modified Y2O3 Ceramic Cores for Investment Casting of Titanium Alloys","authors":"Xusen Guo, Hongna Fan, Nan Wang, Xin Li, Ziqi Jia, Tinglei Zhao, Minmin Li, Xiqing Xu","doi":"10.1016/j.jallcom.2025.181252","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181252","url":null,"abstract":"Y₂O₃ ceramic cores are ideal adapters for titanium alloy casting owing to the excellent high-temperature chemical inertness. However, they are difficult to be chemically de-coring, which seriously limits their application in castings with complex internal cavity. In order to benefit the leaching behavior as well as the chemically compatible with titanium alloys, a new class of Y₂O₃-based cores modified by CaO was investigated in this work. The effects of CaO content on the microstructure, mechanical properties, chemical leachability, and interfacial reaction with TC4 alloy along with the internal cavity roughness were investigated. When the content of CaO was 4<!-- --> <!-- -->wt.%, the porosity is 32.64%, and the room temperature strength was maintained at 19.89<!-- --> <!-- -->MPa, which were close to the performance of ceramic cores with pure Y₂O₃. Citric acid solution was determined to be the ideal leaching solution, which was capable of dissolving Y₂O₃-CaO ceramic cores without affecting the quality and composition of titanium alloy. Compared to pure Y₂O₃ ceramic cores, the leaching behavior was significantly improved by 4<!-- --> <!-- -->wt.% of CaO and the leaching time was reduced from 90<!-- --> <!-- -->h to 6.5<!-- --> <!-- -->h. It was further demonstrated that it has superior high-temperature chemical compatibility in liquid titanium alloys, and this work provides a new guidance for improved leachability of Y₂O₃ ceramic core for investment casting of titanium alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"84 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145807","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":"Impact of TiB2 particle size on microstructure and magnetic properties of Nd-Ce-Fe-B sintered magnets","authors":"Shiyun Wan ,&nbsp;Jiajie Li ,&nbsp;Chen Jiang ,&nbsp;Yue Huang ,&nbsp;Zhixi Deng ,&nbsp;Munan Yang ,&nbsp;Shuwei Zhong ,&nbsp;Xiaoqiang Yu ,&nbsp;Sajjad Ur Rehman","doi":"10.1016/j.jallcom.2025.181198","DOIUrl":"10.1016/j.jallcom.2025.181198","url":null,"abstract":"<div><div>The incorporation of titanium as an additive in Nd-Ce-Fe-B sintered magnets significantly enhances the coercivity through grain refinement. However, the in-situ formed TiB₂ secondary phase consumes boron atoms from the matrix during the sintering process, thereby limiting the remanence enhancement of the magnets. Here, we investigate the impact of TiB₂ addition with various particle sizes (50 nm, 500 nm, and 5 μm) on the microstructure and magnetic properties of Nd-Ce-Fe-B sintered magnets. As the size of TiB₂ particles declines, the remanence (<em>B</em>_r) decreases while the coercivity (<em>H</em>_cj) increases. The interfacial stress induced by TiB₂ particles promotes the segregation of the ZrB₂ phase, reducing the concentration of B atoms in regions adjacent to the TiB₂ phase. This reduction inhibits the decomposition of the Nd₂Fe₁₅Ga₂(B) phase into the Nd₂Fe₁₄B phase, leading to a decrease in the proportion of Nd₂Fe₁₄B phase. Additionally, the irregular growth direction of the acicular ZrB₂ phase is detrimental to the orientation of the 2:14:1 phase, causing the deterioration of the <em>B</em>_r. As the TiB₂ particle size decreases, the contact area and compressive stress increase, along with a rise in the content of Nd₂Fe₁₅Ga₂(B) phase, and ZrB₂ phase. The acicular ZrB₂ phase exerts a pinning effect on the grain boundaries (GBs), hindering the motion of magnetic domain walls, and thereby enhancing the <em>H</em>_cj and thermal stability of the magnet. Controlling the TiB₂ particle size is crucial for balancing the <em>H</em>_cj and <em>B</em>_r. However, the reduction of particle size inevitably leads to agglomeration, posing significant challenges for future efforts to enhance magnetic properties and refine the microstructure through mitigating TiB₂ agglomeration.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1033 ","pages":"Article 181198"},"PeriodicalIF":5.8,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144154081","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":"Role of ignition resistance strengthening (IRS) phases on ignition resistance behaviors and mechanical properties in Mg-4Al-2Ca(-Zn) alloys","authors":"Hongyun Li, Lingxiao Ouyang, Xinyi Xie, Xiongwen Xue, Shicheng Li, Ke Wang, Jinxing Wang, Le Feng, Jingfeng Wang","doi":"10.1016/j.jallcom.2025.181254","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181254","url":null,"abstract":"The role of two types of Ca-containing second phases, (Mg,Al)₂Ca and Ca₂Mg₆Zn₃, on the ignition resistance behaviors and mechanical properties in Mg-4Al-2Ca-xZn (x = 0, 1, 3<!-- --> <!-- -->wt.%) alloys has been investigated. The results demonstrated that both (Mg,Al)₂Ca and Ca₂Mg₆Zn₃ exhibited ignition resistance and strengthening effects, acting as ignition resistance strengthening (IRS) phases. Ca₂Mg₆Zn₃ phase, with lower decomposition temperature than (Mg,Al)₂Ca, played a significant role in promoting the formation of thick and uniform oxide layers during heating. Furthermore, (Mg,Al)₂Ca exhibited a notable influence on the formation of fine DRXed grains and the bimodal grain structure, which enhanced the strengthening effect of alloys. Mg-4Al-2Ca-xZn alloys with different groupings of IRS phases demonstrated significant differences in ignition resistance behavior and mechanical properties. AXZ423 exhibited an ignition resistant property with <em>T</em>_<em>ig</em> of 866℃ and AX42 exhibited the highest UTS of 350<!-- --> <!-- -->MPa. Moreover, AXZ421 containing (Mg,Al)₂Ca and a small amount of Ca₂Mg₆Zn₃ exhibited a balanced match in terms of UTS, YS, EL and <em>T</em>_<em>ig</em> up to 336<!-- --> <!-- -->MPa, 272<!-- --> <!-- -->MPa, 12.6%, and 778 ℃, respectively.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"18 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153788","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 microstructure evolution on the current carrying capacity of Nb3Sn superconductor","authors":"Yuxuan Wang, Juntao Zou, Lixing Sun, Shuhua Liang, Zhe Zhang, Yunfei Bai, Hao Wang, Yujia Yan, Junsheng Cheng, Dazhuo Song, Lin Shi, Yihui Jiang","doi":"10.1016/j.jallcom.2025.181199","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181199","url":null,"abstract":"The optimization of the Nb₃Sn annealing process aims to enhance the engineering critical current density (<em>J</em>_e) of Nb₃Sn superconductors by adjusting the Nb₃Sn content and microstructure. However, the synergistic effect of Nb₃Sn content and microstructure on <em>J</em>_e during annealing remains unclear, which hinders further improvements in superconductor <em>J</em>_e. This work simulated the growth process of Nb₃Sn in superconducting wires by constructing a Nb₃Sn layer at the heterojunction interface of a Cu-15Sn/Nb diffusion couple and conducting high-temperature (≥750℃) annealing treatment. The work investigated the influence of microstructure evolution on the current-carrying capacity of Nb₃Sn superconductors and the evolutionary mechanism of the Nb₃Sn microstructure during annealing. The synergistic effects of Nb₃Sn content (layer width) and its microstructure on the <em>J</em>_e enhancement of CuSn/Nb₃Sn/Nb superconductors were revealed. The transition of the diffusion mechanism in the Nb₃Sn layer and its influence on the growth rate of that layer were elucidated based on dynamics. The coarsening behavior of Nb₃Sn grains due to rotational coupling agglomeration under high grain boundary migration energy was elucidated. Based on the evolution mechanism of the Nb₃Sn microstructure, a matching model was constructed to predict the Nb₃Sn content and average grain size after annealing. An optimization direction was proposed to achieve the best matching between Nb₃Sn content and grain size during the annealing treatment, to prepare high-<em>J</em>_e Nb₃Sn superconductors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"4 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153795","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":"Radiation effects on microstructure and hardening behavior in high-entropy fiber strengthened Al-based alloy","authors":"Xuanpu Zhang, Liyu Hao, Xing Liu, Mingyou Niu, Shangkun Shen, Shiwei Wang, Engang Fu","doi":"10.1016/j.jallcom.2025.181244","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181244","url":null,"abstract":"High-entropy alloys (HEAs) are promising structural materials for space reactors due to their exceptional mechanical properties and irradiation resistance. However, the high weight and maintenance costs associated with conventional Fe-based HEAs limit their practical use. In this study, a novel high-entropy fiber (HEF)-strengthened aluminum alloy, Al₉₆(NiCoFeCr)₄, was developed by incorporating typical Cantor alloy elements (Fe, Co, Ni, and Cr) into a lightweight Al matrix. Both the HEF-strengthened alloy and pure Al were irradiated with 3<!-- --> <!-- -->MeV Al ions at 150 °C, reaching a peak irradiation damage level of 50<!-- --> <!-- -->dpa. The microstructural evolution of the HEF-strengthened Al was systematically investigated and discussed. Comparative analysis revealed that the HEF-strengthened Al exhibited significantly enhanced irradiation resistance compared to pure Al. This improvement is attributed to the Cr–Al atomic exchange mechanism proposed in this study, wherein Cr atoms migrate from the HEFs into the matrix, while Al atoms diffuse in the opposite direction. The two materials exhibit different degrees of irradiation-induced hardening rate, which can be explained by the evolution of HEFs and irradiation-induced defects. These findings offer valuable insights into the development of lightweight, irradiation-resistant structural materials for space nuclear reactors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"45 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144145801","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":"Study of 2.0 μm luminescence in Ho3+ doped TeO2-GeO2-BaF2 glasses sensitized by Tm3+ ions","authors":"Zhenyu Zhou, Chi Zhang, Kexuan Han, Ruizhen Pang, Wei Zheng, Dechun Zhou, Zhuang Leng","doi":"10.1016/j.jallcom.2025.181233","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181233","url":null,"abstract":"75TeO₂-10GeO₂-15BaF₂ co-doped with Tm³⁺/Ho³⁺ glasses were fabricated through a high-temperature fusion method. The structural details were derived from XRD and XPS analysis. According to absorption spectra, J-O and radiative parameters were calculated by Judd-Ofelt theory. 2.0 μm emission with a broad effective fluorescence bandwidth (184.59<!-- --> <!-- -->nm) and large emission cross-section was achieved under excitation of 808<!-- --> <!-- -->nm LD. The gain spectra were used to estimate the pump threshold. The FOM for amplifier gain and bandwidth was calculated. Furthermore, the energy transfer process and microparameters were examined and discussed in depth. The C_D-A (511.06×10^-40 cm⁶/s) exceeds C_A-D (86.52×10^-40 cm⁶/s) in value, revealing the effective ET from Tm³⁺ to Ho³⁺. As mentioned above, 75TeO₂-10GeO₂-15BaF₂ glasses co-doped with Tm³⁺/Ho³⁺ are competitive in the 2 μm as a novel laser material.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"151 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144153793","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}