Intermetallics最新文献

{"title":"Creep deformation behavior of an oxide dispersion strengthened modified iron aluminide alloy","authors":"Sumanta Bagui ,&nbsp;Chandra Veer Singh ,&nbsp;Bhupeshwar Mahato ,&nbsp;R. Vijay","doi":"10.1016/j.intermet.2025.108860","DOIUrl":"10.1016/j.intermet.2025.108860","url":null,"abstract":"<div><div>The present investigation highlights the creep deformation behavior of the yttria dispersion strengthened iron aluminide alloy in the temperature range of 600–700 °C at different stress levels. A relatively higher value of apparent Norton exponent (∼9 at 600 °C, 12.6 at 650 °C and 12.9 at 700 °C) of the investigated alloy has been rationalized with the incorporation of the concept of the threshold stress. After determining the threshold stress value of 103.6 MPa at 600 °C, 84.2 MPa at 650 °C and 74 MPa at 700 °C, the true Norton exponent value has been found as ∼3, which estimates the occurrence of glide-controlled creep mechanism in the investigated alloy. The TEM investigation of creep-tested sample substantiate the aforementioned governing creep deformation mechanism. The apparent activation energy for creep deformation has been found to be higher (∼613.7 kJ/mol) in the temperature range of 600–625 °C, and relatively lower (∼310.9 kJ/mol) in the temperature range of 650–700 °C. However, the true value of activation energy for creep deformation has been identified to be constant (∼44.2 kJ/mol) in the temperature range of 600–700 °C. Both the Modified Monkman-Grant relation and microscopic investigations of the investigated alloy have revealed a stable microstructural feature after creep deformation, which comprises nanometer-sized Y₂O₃ within the iron aluminide matrix. The Kernel Average Misorientation analyzed through EBSD analysis of the creep-tested samples have been correlated with the apparent Norton exponent and activation energy for creep deformation.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108860"},"PeriodicalIF":4.3,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144195999","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":"Exploring the lubricating effect of graphene in nano AlCoCrFeNi high-entropy alloy","authors":"Zhimin Liu ,&nbsp;Ruiyang Wang ,&nbsp;Juan Li ,&nbsp;Guanghui Zhao","doi":"10.1016/j.intermet.2025.108863","DOIUrl":"10.1016/j.intermet.2025.108863","url":null,"abstract":"<div><div>The graphene/AlCoCrFeNi high-entropy alloy (HEA) composite demonstrated numerous exceptional properties, including enhanced mechanical performance, superior friction and wear resistance, and excellent thermal stability. However, the lubrication mechanism of graphene remains unclear. In this study, we thoroughly analyzed the material's frictional force, coefficient of friction (COF), surface damage, energy variations, temperature distribution, stress field characteristics, and internal defect evolution during the wear process through molecular dynamics (MD) simulations. The results indicate that the graphene coating significantly reduces frictional force and fluctuations in the friction curve, while the graphene interlayer eliminates the traditional stable fluctuation stage, reduces nano-scratch defects, and slightly lowers the radial distribution function (RDF) peak. Concurrently, the maximum dislocation depth decreases with increasing scratch distance. Temperature and grain size exhibit minimal influence on Coating-HEA but substantially affect Composite-HEA, particularly as interfacial bonding strength peaks at 300 K. Notably, stacking faults (SFs) and other defects within Composite-HEA tend to reconstruct or annihilate under high-temperature conditions (1000 K). Furthermore, compared to the (110) and (111) crystallographic planes, the (001) plane mitigates interfacial stress concentration and further reduces the COF owing to its homogeneous atomic arrangement. This work provides mechanistic insights into the wear-resistant mechanisms of graphene-reinforced HEAs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108863"},"PeriodicalIF":4.3,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144185471","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 element substitution on hydrogen storage properties of La-Mg-Ni-based alloys prepare by heat treatment","authors":"Hao Li ,&nbsp;Jianshe Zhang ,&nbsp;Yingjie Wang ,&nbsp;Tingting Zhai ,&nbsp;ZeMing Yuan ,&nbsp;Yongguang Wang ,&nbsp;Yanghuan Zhang ,&nbsp;Dianchen Feng","doi":"10.1016/j.intermet.2025.108861","DOIUrl":"10.1016/j.intermet.2025.108861","url":null,"abstract":"&lt;div&gt;&lt;div&gt;La-Mg-Ni-based hydrogen storage alloy has become a promising material due to its high hydrogen storage capacity and easy activation. Nevertheless, the use of this alloy system is constrained by its inadequate cycle steadiness, limiting its prospects for widespread commercialisation and industrialisation. In this work, Y and Mn elements with smaller atomic radius are used to partially replace La and Ni elements with larger atomic radius in La-Mg-Ni-based hydrogen storage alloys, so as to reduce the difference in phase volume between LaMgNi&lt;sub&gt;4&lt;/sub&gt; phase and La(NiMn)&lt;sub&gt;5&lt;/sub&gt; phase. Annealing treatment promotes the diffusion of alloying elements, eliminates the segregation of as-cast elements, and homogenizes the spatial distribution of AB&lt;sub&gt;2&lt;/sub&gt; and AB&lt;sub&gt;5&lt;/sub&gt; phases in the material matrix, improving its cycle stability. The synergistic effect of the element substitution strategy combined with the annealing process on the hydrogen storage performance of La-Mg-Ni-based alloys was systematically explored, including phase composition, microstructure, kinetic performance, cycling performance, and thermodynamic performance. The research findings suggest that the primary phase structure of annealed alloys consists of LaMgNi&lt;sub&gt;4&lt;/sub&gt; and La(NiMn)&lt;sub&gt;5&lt;/sub&gt; phases. With the increase of Y substitution, YMgNi&lt;sub&gt;4&lt;/sub&gt; and Ni&lt;sub&gt;3&lt;/sub&gt;Y phase structures appear. There is a small amount of YH&lt;sub&gt;2&lt;/sub&gt; phase in the hydrogen storage alloy after dehydrogenation due to the substitution of Y, which is due to the high decomposition temperature of YH&lt;sub&gt;2&lt;/sub&gt;. The Ni&lt;sub&gt;3&lt;/sub&gt;Y phase and YH&lt;sub&gt;2&lt;/sub&gt; introduce more phase interfaces and boundaries of grains, which enhances the hydrogen uptake and release rates. The as-cast alloy is annealed for a more uniform distribution of elements, and the structure changes from a strip-like dendrite to a cellular crystal. The interphase distribution of the cellular crystal structure provides a good diffusion channel for the migration of hydrogen atoms during the hydrogen absorption/desorption process, which significantly improves the hydrogen absorption rate of the alloy. All annealed hydrogen storage alloys can be fully activated after one hydrogen absorption/desorption cycle. The first activation of Y4 alloy at 373 K temperature only takes 15 min to reach 90 % of the maximum hydrogen absorption capacity, which is nearly 57 % shorter than that of Y0 alloy. The annealed Y4 alloy has a 1.67 wt% hydrogen absorbing ability at 313 K and a 1.26 wt% hydrogen desorption ability at 373 K. With a rise in the replacement of Y elements, the capacity retention rises from 52.21 % to 74.55 % following 50 kinetic cycles of the alloy. The substitution of Y element reduces the phenomenon of crack propagation and pulverization on the surface of the particles during the hydrogen absorption and desorption process, thus significantly improving the cycle stability of La-Mg-Ni-based hydrogen storage alloys. ","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108861"},"PeriodicalIF":4.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144177537","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":"Corrigendum to “Simultaneously improving the plasticity and corrosion resistance of biomedical Mg-based bulk metallic glass by introducing SnZn alloy solder” [Intermetallics 182 (2025) 108791]","authors":"Shujian Zhou ,&nbsp;Shilu Chen ,&nbsp;Peng Du ,&nbsp;Rongqiang Yan ,&nbsp;Bo Yuan ,&nbsp;Zeyun Cai ,&nbsp;Liang Zhang ,&nbsp;Guoqiang Xie","doi":"10.1016/j.intermet.2025.108811","DOIUrl":"10.1016/j.intermet.2025.108811","url":null,"abstract":"","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108811"},"PeriodicalIF":4.3,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242309","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":"Influence of minor refining additives Al and Mn on the amorphous structure formation in the Fe-Co-Ni-Cr-V-B alloy","authors":"Andrey Bazlov ,&nbsp;Evgeniy Ubyivovk ,&nbsp;Erzhena Zanaeva ,&nbsp;Mark Parkhomenko","doi":"10.1016/j.intermet.2025.108850","DOIUrl":"10.1016/j.intermet.2025.108850","url":null,"abstract":"<div><div>The paper studies the effect of small additions, not exceeding 0.2 %, of aluminum and manganese on the structure of ingots and the tendency to amorphization of the high entropy alloy (Fe₀_.25Ni_0.25Co_0.25Cr_0.125V_0.125)₈₃B₁₇. The addition of aluminum and manganese affects the phase composition of the ingots, suppressing the crystallization of the MeB boride and increasing the content of the eutectic component. The optimum amount of additives that lead to the formation of a completely amorphous structure during the melt spinning process has been established. The relationships between the alloy crystallization process and the tendency to form an amorphous structure during melt spinning process are determined. The work shows that amorphous multicomponent alloys with the addition of vanadium require a special approach, since vanadium acts as an internal nitrogen getter and forms refractory nitride particles. It is shown that refractory particles, which are crystallization centers, can form during the master alloy production process and make it difficult to obtain a single amorphous state during the melt spinning process.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108850"},"PeriodicalIF":4.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148099","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":"Microstructure and wear performance of CoCrFeNi multi-principal element alloy coating deposited using laser cladding","authors":"Zhiyuan Wang ,&nbsp;Mengjiao Xia ,&nbsp;Chuilei Kong","doi":"10.1016/j.intermet.2025.108829","DOIUrl":"10.1016/j.intermet.2025.108829","url":null,"abstract":"<div><div>CoCrFeNi multi-principal element alloy (MPEA) coatings prepared using laser cladding (LC) with unique properties have aroused great interest in recent years and have been widely studied. However, there is little research on the influence of various process parameters during the LC process on the coating. In this study, CoCrFeNi MPEA LC coatings were prepared within the process range of laser power at 650–800 W and powder feeding speed 9–13g⋅min⁻¹. The grain structures and microscopic morphologies of coatings were characterized, and the wear mechanisms were analyzed using the nano-indentation and wear tests. The results show that the prepared MPEA coatings are of good quality and contain a single FCC phase. When the laser power increases to 800 W, excessive laser power causes some Ti atoms to enter the coating to form a Ti-rich phase. The titanium-rich phase has high hardness, but it is easy to generate brittle TiO₂ in the wear test, which is not conducive to the improvement of wear performance. The coatings carried the load and improved the wear resistance of the substrate. Through this study, the application field of high-hardness MEA coating can be further expanded.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108829"},"PeriodicalIF":4.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148102","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":"Microstructure and corrosion performance of laser-cladded AlCrFeNiNb high-entropy alloy coating on 316L steel in liquid lead-bismuth eutectic","authors":"Xianfeng Ma ,&nbsp;Changquan Xiao ,&nbsp;Wenjian Zhu,&nbsp;Da Wang,&nbsp;Bihan Sun,&nbsp;Sirui Liu","doi":"10.1016/j.intermet.2025.108852","DOIUrl":"10.1016/j.intermet.2025.108852","url":null,"abstract":"<div><div>The AlCrFeNiNb high-entropy alloy (HEA) coating was prepared on 316L austenite steel by laser cladding. The microstructure of as-received coating sample and its corrosion behavior in 550 °C lead-bismuth eutectic (LBE) with 5 × 10⁻⁶ wt% oxygen concentration for 300, 700, and 1000 h of exposure were investigated. The results show that the coating exhibits compact structure, metallurgical bonding, lower oxidation rate, but susceptible to dissolution corrosion when absence of an oxide scale. The corrosion mechanism of the HEA coating in the LBE, and the positive or negative effects of the phase compositions of coating on the corrosion behavior were discussed. The optimization of fabricating coating is also raised based on the results.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108852"},"PeriodicalIF":4.3,"publicationDate":"2025-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144148103","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":"Synergistically enhancing the strength and ductility of TiAl alloy through in-situ precipitation of Ti2AlC and TiB2 nanoparticles","authors":"Dingbang Sun ,&nbsp;Yingchao Guo ,&nbsp;Huijun Wang ,&nbsp;Yongfeng Liang ,&nbsp;Junpin Lin ,&nbsp;Hui Xue","doi":"10.1016/j.intermet.2025.108853","DOIUrl":"10.1016/j.intermet.2025.108853","url":null,"abstract":"<div><div>In our previous research, the tensile properties of the sintered TiAl + <em>x</em>B₄C composites were significantly enhanced with the addition of nano-B₄C at both room temperature and elevated temperature. However, these composites demonstrated almost no ductility at room temperature. In this study, heat treatment was applied to Ti₂AlC/TiB₂-Ti-48Al-7Nb-(V, Cr) composites to enhance their ductility. Additionally, an investigation of the evolution of the microstructure and tensile properties was carried out at room temperature and elevated temperature. The results indicate that a greater number of Ti₂AlC nanoparticles precipitated at the interface of the lamellae, while the content of α₂ phase decreased following heat treatment. At room temperature, after being heat-treated at 900 °C for 48 h, the elongation significantly improved from 0.11 ± 0.03 % to 0.53 ± 0.04 %. However, the ultimate tensile strength slightly decreased from 631 ± 28 MPa to 602 ± 10 MPa. At elevated temperatures (800 °C), the elongation increased from 2.2 ± 0.2 % to 7.3 ± 0.8 %, while the ultimate tensile strength remained similar, measuring 627 ± 19 MPa and 624 ± 12 MPa, respectively. Compared to the TiAl alloy without the addition of nano-B₄C, both the strength and elongation of the composites have significantly improved following heat treatment.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108853"},"PeriodicalIF":4.3,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144137941","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":"Beyond elemental intrinsic characteristics: ΔHmixB−F-driven solid solution phase structure modeling in HEAs","authors":"K.X. Yin ,&nbsp;Y. Yiliti ,&nbsp;S.T. Li ,&nbsp;C.Y. Zhang ,&nbsp;Y.K. Zhou ,&nbsp;H.F. Zhang ,&nbsp;Z.W. Zhu","doi":"10.1016/j.intermet.2025.108838","DOIUrl":"10.1016/j.intermet.2025.108838","url":null,"abstract":"<div><div>This study introduces an innovative approach for predicting solid-solution phase structures in high-entropy alloys (HEAs) by integrating a thermodynamic mixing enthalpy difference parameter <span><math><mrow><mo>Δ</mo><msubsup><mi>H</mi><mtext>mix</mtext><mrow><mi>B</mi><mo>−</mo><mi>F</mi></mrow></msubsup></mrow></math></span>—quantifying inter-element interactions between BCC and FCC structures—with conventional descriptors representing elemental intrinsic properties, including valence electron concentration (VEC), atomic size mismatch (δ), and Gibbs free energy differences of pure elements in dual-phase configurations (<span><math><mrow><mo>Δ</mo><msub><mi>G</mi><mn>0</mn></msub></mrow></math></span>). This synergistic framework significantly enhances the predictive accuracy for solid solution phase structures in HEAs, achieving a classification consistency rate (CCR) of 94.9 % across 569 HEA systems through the combined VEC+ <span><math><mrow><mo>Δ</mo><msubsup><mi>H</mi><mtext>mix</mtext><mrow><mi>B</mi><mo>−</mo><mi>F</mi></mrow></msubsup></mrow></math></span> parameter. To validate the methodology, a series of unreported transition-metal-rich AlCoCrNiV-based HEAs were synthesized and systematically characterized via X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) coupled with energy-dispersive spectroscopy (EDS), and transmission electron microscopy (TEM) with microchemical analysis. The experimental observations exhibit excellent agreement between the predicted phase constitutions and the observed structural features, demonstrating the reliability and practical applicability of the proposed strategy. This work establishes a robust foundation for rational HEA design and provides critical guidance for advancing predictive frameworks in multi-component alloy systems through the integration of thermodynamic principles and empirical descriptors.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108838"},"PeriodicalIF":4.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123621","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 gradient nanostructures on mechanical properties of Ti/AlCoCrFeNi composites","authors":"Qiping Zhou,&nbsp;Junming Luo,&nbsp;Shiyu Cui,&nbsp;Zhesong Wang","doi":"10.1016/j.intermet.2025.108855","DOIUrl":"10.1016/j.intermet.2025.108855","url":null,"abstract":"<div><div>Despite the challenges in engineering applications, the strength, plasticity, and wear resistance of metallic materials still exist, especially at room temperature, where these properties are critical to the performance of the materials. However, there is a certain gap in current research in revealing the mechanism of the effect of high entropy alloys (HEA) and fine grain structure (GNS) on room temperature properties. The aim of this study is to investigate the synergistic effect of HEA particles and GNS and their enhancement on the properties of titanium matrix composites under room temperature conditions. The experimental results showed that with the formation of GNS and the strengthening effect of HEA particles significantly increased the strength and wear resistance of the material. This study provides new insights into the interaction between HEA and GNS at room temperature and opens up new directions for the future development of highly wear-resistant metallic materials, with significant potential value especially in aerospace and other applications requiring high-performance components.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"184 ","pages":"Article 108855"},"PeriodicalIF":4.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123616","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}