Xing Zhou, Enze Zhou, Yilan Wang, Yongqiang Fan, Chunguang Bai, Lin Wu, Dake Xu, Qiang Wang, Dan Zhang, Fuhui Wang
{"title":"Cu alloying enabling dual biocorrosion suppression and fatigue crack mitigation in SLM-processed titanium implants with retained osteogenic activity","authors":"Xing Zhou, Enze Zhou, Yilan Wang, Yongqiang Fan, Chunguang Bai, Lin Wu, Dake Xu, Qiang Wang, Dan Zhang, Fuhui Wang","doi":"10.1016/j.jmst.2025.06.006","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.06.006","url":null,"abstract":"Titanium (Ti) alloys are extensively utilized in dental and orthopedic implants due to superior mechanical strength, biocompatibility, and corrosion resistance. Their vulnerability to concurrent microbiologically influenced corrosion (MIC) under oral biofilm colonization and cyclic fatigue critically compromises long-term reliability. While antibacterial functionality integration with MIC resistance remains underexplored in Ti alloys, the synergistic effect of copper (Cu) alloying on corrosion-fatigue performance in physiological environments represents a significant knowledge gap. This study systematically investigates MIC and corrosion-fatigue degradation mechanisms of selective laser melting (SLM)-processed Ti versus Ti-5Cu alloys exposed to <em>Streptococcus mutans</em> (<em>S. mutans</em>). Multimodal characterization integrating electrochemical analysis, <em>in-situ</em> fatigue monitoring, and surface/microstructural diagnostics reveal synergistic enhancements in biofilm-inhibiting capability and fatigue durability through Cu incorporation. After 14-day incubation with <em>S. mutans</em>, Ti-5Cu exhibits 48% lower corrosion current density than pure Ti, attributed to Cu-mediated biofilm suppression. Following 90 days of dual microbial/cyclic stress exposure, Ti-5Cu demonstrates 47.5% reduced ultimate tensile strength loss (42.5 vs. 81 MPa) and 57.3% lower fatigue life degradation (15.1 vs. 35.4 MPa). Crucially, 70% shallower maximum pitting depth (3.3 vs. 10.9 μm) and inhibited crack propagation directly correlate with Cu’s antimicrobial efficacy. SLM-driven microstructural refinement further amplifies damage tolerance. Cytocompatibility assays confirm uncompromised cell viability and osteoblast adhesion on alloyed surfaces. These findings establish a dual-functional implant design paradigm combining antimicrobial surface chemistry with fatigue-resistant microstructural engineering to extend biomedical device service lifetimes.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"25 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Compositional and structural engineering of multicomponent borides hollow microspheres with superior microwave absorption performance","authors":"Peitao Hu, Jingren Xu, Shun Dong, Kaixuan Gui, Ping Hu, Xinghong Zhang, Yanchun Zhou","doi":"10.1016/j.jmst.2025.05.035","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.05.035","url":null,"abstract":"Microwave-absorbing materials with excellent comprehensive performance and high-temperature structural stability are highly favored in practical applications. In extreme environments, boride ultra-high temperature ceramics are considered as promising absorbing materials, however, their high density and poor impedance matching often result in unsatisfactory performance. In this study, based on a multicomponent composition design strategy and hollow microsphere structural engineering, we synthesized multicomponent boride hollow microspheres (MBHMs) for the first time through the well-designed cross-linked network structure and self-assembly of boride nanoparticles. The influence of various elemental compositions on the wave-absorbing properties of the samples was systematically investigated. By fine-tuning the elemental components, the dielectric loss and impedance matching could be easily adjusted, and the optimized samples demonstrated outstanding absorption performances, particularly the (Zr, Hf, Ta)B<sub>2</sub> samples doped with moderate Ti and Cr, which exhibited minimum reflection loss (RL<sub>min</sub>) of −53.56 and −68.07 dB, along with effective absorption bandwidth (EAB) of 4.88 and 3.20 GHz, respectively. The excellent performances surpass those of many previously reported absorbers with similar compositions. Furthermore, radar cross-section (RCS) simulation results indicate that such materials exhibit excellent stealth performance in practical applications. This research elucidates that the integration of component design and hollow structure engineering is an effective strategy for developing high-performance microwave-absorbing materials and the findings offer novel perspectives for the advancement of novel lightweight, high-temperature-resistant wave-absorbing materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"8 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaying Ma, Kerong Ren, Rong Chen, Hang Wang, Zihan Zhang, Peiyuan Ma, Shun Li, Jiaqiang Wu
{"title":"Shock-induced deformation and spallation of TiZrNb refractory multi-principal element alloy subjected to plate impact loadings","authors":"Xiaying Ma, Kerong Ren, Rong Chen, Hang Wang, Zihan Zhang, Peiyuan Ma, Shun Li, Jiaqiang Wu","doi":"10.1016/j.jmst.2025.04.067","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.04.067","url":null,"abstract":"Refractory multi-principal element alloys (RMPEAs) have favorable engineering application prospects due to their exemplary mechanical properties. However, there is a dearth of knowledge regarding the dynamic properties of RMPEAs, which constrains the material design of RMPEAs considering impact performances. To address this issue, in this study, the dynamic compression and spallation behavior of a single-phase body-centered cubic (BCC) TiZrNb RMPEA at impact velocities of 381–723 m s<sup>−1</sup> via single-stage gas gun plate impact experiments was investigated. The Hugoniot parameters were <em>c</em><sub>0</sub>=4.162 km s<sup>−1</sup> and <em>s</em> = 1.005, with a spall strength of 2.18–2.41 GPa. Microstructural analysis showed that spallation damage primarily involved a mix of intergranular and intragranular cracks. Dynamic deformation was mainly controlled by dislocation cross-slip and shear bands (SBs), with the Laves phase inducing localized stress concentrations that promoted void coalescence and reduced spall strength. Moreover, a quantitative relationship between the valence electron concentration, the atomic mass, the impact pressure and the shock bulk modulus was established, through the cold-energy mixture theory and a Particle Swarm Optimization-Back Propagation Neural Network (PSO-BPNN) model, which combined the theory of mechanics and the artificial intelligence algorithm, offering key insights into the materials design for the impact performance of MPEAs.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"44 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Enhancing the resistance to hydrogen embrittlement in bainitic steel via grain refinement, dislocation density reduction, and retained austenite stability improvement","authors":"Zhuanqin Liang, Hongguang Li, Qingchao Wang, Xiaowen Sun, Xinliang Gao, Sujuan Yuan, Zhinan Yang, Fucheng Zhang","doi":"10.1016/j.jmst.2025.04.070","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.04.070","url":null,"abstract":"Hydrogen traps influence hydrogen embrittlement (HE) in steel by regulating hydrogen diffusion and enrichment. This study provides an in-depth examination of the HE mechanism in bainitic steel with varying aluminum content by designing and optimizing grain size, dislocation density, and retained austenite (RA) stability. Hydrogen charging increases dislocation density, leading to a higher local hydrogen concentration. Simultaneously, it reduces the stability of RA, making it more susceptible to martensitic transformation. The interaction of these factors significantly increases the HE susceptibility of the steel, transforming the fracture morphology from ductile fracture to a combination of intergranular and quasi-cleavage fractures. The HE susceptibility of the steel decreases with increasing Al concentration, which is attributed to grain refinement, reduced dislocation density, and enhanced RA stability. The refinement of prior austenite grains and the reduction in bainitic ferrite lath thickness significantly increase the density of phase boundaries, facilitating uniform hydrogen trapping and suppressing grain boundary hydrogen enrichment. Meanwhile, the reduction in dislocation density decreases the temporary retention of hydrogen in reversible traps, preventing its re-release and further diffusion. Additionally, highly stable RA effectively mitigates hydrogen redistribution caused by stress-induced phase transformation. These combined effects reduce the hydrogen diffusion coefficient of Al-0.6 steel by approximately 41% compared to Al-0 steel, improving HE resistance by about 24% and resulting in a more tortuous crack propagation path. However, at low temperatures, the sharp decline in RA stability weakens this advantage, leading to only a slight 2% improvement in the HE resistance of Al-0.6 steel. In summary, compared to optimizing dislocation density and grain size, RA stability is the key factor in regulating HE sensitivity.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"14 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuefei Jia, Gengchen Li, Hongming Yang, Xiaochang Xie, Ping Yang, Long Xu, Zhibin Wu, Yongkun Mu, Kang Sun, Shiwei Wu, Xilei Bian, Yandong Jia, Gang Wang
{"title":"Achieving ambient superformability in a lightweight refractory medium-entropy alloy via stagewise adaptive microstructural buffers","authors":"Yuefei Jia, Gengchen Li, Hongming Yang, Xiaochang Xie, Ping Yang, Long Xu, Zhibin Wu, Yongkun Mu, Kang Sun, Shiwei Wu, Xilei Bian, Yandong Jia, Gang Wang","doi":"10.1016/j.jmst.2025.04.071","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.04.071","url":null,"abstract":"Lightweight refractory high- and medium-entropy alloys (LRH/MEAs) are being explored as potential materials for lightweight applications owing to their low densities, high strengths, and excellent strength-to-weight ratios. However, their limited ductility and formability under ambient conditions restrict their broad industrial applications, particularly in the manufacturing of highly valuable, hot-sectional parts with complex geometries. Although recent studies have advanced the understanding of ductilization in these alloys, practical solutions to overcome the ambient ductility and formability limitations remain elusive. Here, we report an exceptional superformability in ambient cold-rolling of a strong-yet-ductile Ti<sub>50</sub>V<sub>29.5</sub>Zr<sub>10</sub>Nb<sub>10</sub>Mo<sub>0.5</sub> (at.%) LRMEA, achieving a remarkable elongation of 1600% at a thickness reduction of 96%, without the need for intermediate stress-relieving annealing. The observed superformability arises from the adaptive buffering microstructures that evolve during the cold-rolling process, namely, slip and kink bands in the early stage, kink and shear bands in the moderate stage, and shear bands and dislocation channels in the late stage. These localized microstructures act as adaptive stress buffers, effectively mitigating stress concentrations, and thereby preventing crack initiation and propagation. After cold-rolling annealing at 400°C for 1 h, the 0.2 mm-thin LRMEA strip reaches an ultrahigh yield strength of 1.5 GPa while maintaining a sufficient elongation of 10%. These findings demonstrate that the engineering of stagewise adaptive microstructural buffers is a promising strategy for mitigating stress concentrations and achieving superior performances. This strategy can be utilized in the future design of ductile, superformable refractory alloys, such as LRH/MEAs, with potential applications in engineering sectors that require high-strength, lightweight thin strips.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"17 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335416","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"MOF-derived high-entropy oxide-modified graphite felt for enhanced electrochemical performance in vanadium redox flow batteries","authors":"Xingyu Pan, Xinsheng Cheng, Tiantian Deng, Ligang Xia, Junxi Zhang, Yulin Min, Qiang Wu, Qunjie Xu","doi":"10.1016/j.jmst.2025.05.033","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.05.033","url":null,"abstract":"This study employs a MOF-induced strategy to synthesize high-entropy oxide (HEO)-modified graphite felt (GF) electrodes and systematically investigates their electrochemical performance in vanadium redox flow batteries (VRFBs). The spatial confinement effect of the MOF precursor ensures the homogeneous distribution of Zn, Mo, La, Ni, and Co multi-metallic ions, while the high-entropy stabilization effect strengthens the structural stability of the material, offering significant advantages for electronic structure tuning and oxygen vacancy introduction. Experimental results demonstrate that compared to medium-entropy oxide (MEO) electrodes, HEO electrodes exhibit superior redox kinetics, lower interfacial impedance, and enhanced electron transport capability. XPS analysis reveals that oxygen vacancies in the HEO structure serve as additional active sites for V species, accelerating the redox reaction and reducing polarization during charge-discharge processes. In VRFB single-cell tests, the electrode maintained high energy efficiencies of 87.05% at 100 mA cm<sup>−2</sup> and 82.40% at 200 mA cm<sup>−2</sup>, while retaining 76.16% of its capacity after 500 cycles, demonstrating excellent cycling stability and high-rate cycling performance. This study demonstrates that the MOF-induced high-entropy oxide strategy enhances the electrochemical performance of VRFB electrodes, offering valuable insights for the design of advanced energy storage materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"45 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sakthivel Kumaravel, Kamakshaiah Charyulu Devarayapalli, Bolam Kim, Youngsu Lim, Dae Sung Lee
{"title":"MXene-boosted MOF-derived hierarchical porous C, N-doped In2O3/Gd2MoO6 heterostructures with rich oxygen vacancies enable highly efficient bifunctional electrocatalysts for water/seawater electrolysis","authors":"Sakthivel Kumaravel, Kamakshaiah Charyulu Devarayapalli, Bolam Kim, Youngsu Lim, Dae Sung Lee","doi":"10.1016/j.jmst.2025.05.034","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.05.034","url":null,"abstract":"Developing efficient non-noble metal catalysts is crucial for reducing costs and addressing the scarcity issues associated with noble-metal-based electrocatalysts for water splitting. In this study, metal-organic frameworks-derived C, N-doped In<sub>2</sub>O<sub>3</sub> with abundant oxygen vacancies were synthesized by pyrolysis of NH<sub>2</sub>-MIL-68(In). To enhance its performance, 3D flower-like <em>x</em>Gd<sub>2</sub>MoO<sub>6</sub> (<em>x</em> = 10, 20, 30, 40, and 50 wt.%) was integrated with In<sub>2</sub>O<sub>3</sub> and 5% MXene, forming a composite denoted as <em>x</em>-GInMx. The bifunctional 4-GInMx@nickel foam (NF) electrocatalyst exhibited outstanding performance, achieving low hydrogen evolution reaction (HER) overpotentials (<em>η</em>) of 110 and 104 mV with Tafel slopes of 83 and 76 mV/dec at current density (<em>J</em>) of 10 mA/cm<sup>2</sup> in alkaline freshwater (FW) and natural seawater (SW), respectively. Additionally, it demonstrated low oxygen evolution reaction (OER) <em>η</em> of 160 and 200 mV, along with Tafel slopes of 97 and 77 mV/dec in FW and SW, respectively. Notably, 4-GInMx@NF outperformed RuO<sub>2</sub>@NF and approached the performance of Pt/C@NF, while also demonstrating excellent stability in corrosive SW environments. The overall water-splitting electrolyzer assembled with 4-GInMx@NF||4-GInMx@NF electrode achieved low cell voltages of 1.56 (FW) and 1.62 V (SW) at 10 mA/cm<sup>2</sup>, outperforming the benchmark Pt/C@NF||RuO<sub>2</sub>@NF electrolyzer. Additionally, density functional theory calculations provide evidence of improved catalytic activity and reaction kinetics of the GInMx heterostructures by analyzing the underlying HER and OER pathways. The exceptional performance of 4-GInMx is attributed to its high surface area, synergistic effects, multiple active sites, enhanced electrical conductivity, and resistance to structural degradation. This work highlights 4-GInMx as a promising, cost-effective bifunctional electrocatalyst for sustainable H<sub>2</sub> production, reduced carbon emissions, and enhanced environmental protection.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"16 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144329206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Kaixuan Yu, Qianqian Cheng, Jun Cheng, Yushan Geng, Shengyu Zhu, Kaifeng Zhang, Shanhong Wan, Jun Yang
{"title":"Achieving excellent wear resistance in NbTiTa medium-entropy alloy self-lubricating composites at high-temperature via nano-Al2O3 reinforcement","authors":"Kaixuan Yu, Qianqian Cheng, Jun Cheng, Yushan Geng, Shengyu Zhu, Kaifeng Zhang, Shanhong Wan, Jun Yang","doi":"10.1016/j.jmst.2025.04.072","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.04.072","url":null,"abstract":"Refractory high-entropy/medium-entropy alloys (RHEAs/RMEAs) demonstrate excellent thermal stability and mechanical properties at elevated temperatures. However, under high-temperature non-inert tribological conditions, the differences in oxidation activity among the constituent elements lead to instability at the sliding interface, thereby affecting the wear resistance of the material. In this work, we report a novel strategy to achieve low wear rates in NbTiTa self-lubricating composites by in situ formation of a nanocrystalline-amorphous composite layer and phase boundary transformation of Al<sub>2</sub>O<sub>3</sub> nanoparticles. During high-temperature friction, the complex composition (NbTiTa, Al<sub>2</sub>O<sub>3</sub>, Ag, and CaF<sub>2</sub>/BaF<sub>2</sub> eutectics) and the high-density grain boundary of the composites promote the formation of oxide glazes on the sliding surface. An amorphous (NbTiTa-O)-nanocrystalline tribo-layer of approximately 2.1 μm thick is formed at 600°C, exhibiting a microhardness of approximately 15.8 ± 1.6 GPa and remarkable resistance to plastic deformation. Furthermore, the incompatible deformation between the NbTiTa alloy and Al<sub>2</sub>O<sub>3</sub> during friction induces the interphase boundary transition from an incoherent to an amorphous structure. This interfacial transformation effectively absorbs the strain energy of the alloy during friction and inhibits crack nucleation. Consequently, the designed NbTiTa self-lubricating composite maintains an exceptionally low wear rate (10<sup>−7</sup>–10<sup>−6</sup> mm<sup>3</sup> N<sup>−1</sup> m<sup>−1</sup>) at 600 and 800°C. Therefore, this study provides a universally applicable strategy and valuable insights for the design of high-temperature wear-resistant self-lubricating composites.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"43 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144335400","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Precipitation mechanism and age hardening behavior in a FeCoNiCr-based multi-principal element alloy","authors":"Mengchao Zhang, Weiping Chen, Qingdong Liu, Mingyang Liu, Lanting Zhang, Zemin Wang, Hui Li","doi":"10.1016/j.jmst.2025.04.069","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.04.069","url":null,"abstract":"Multi-phase synergistic strengthening can substantially improve the strength of alloys by utilizing a variety of phases. However, the application of this strengthening approach in the multi-principal element alloys (MPEAs) is still limited. An ultra-high strength Fe<sub>56</sub>Co<sub>28</sub>Ni<sub>10</sub>Cr<sub>5</sub>(AlMo)<sub>1</sub> (at.%) alloy with multiple strengthening phases was prepared by blending CoFeNi alloy and 18Ni300 alloy powders via selective laser melting. The alloy demonstrated an ultra-high peak hardness of 692.5±4.8 HV after aging for 128 h at 400°C, which was caused by the synergetic strengthening of multiple phases. The size, number density, composition, and spatial distribution of various phases as a function of aging time were systematically characterized by atom probe tomography and transmission electron microscopy. The results show that the matrix exhibits a body-centered cubic (BCC) structure. The secondary phases were identified to be the Al<sub>2</sub>O solidification phase with face-centered cubic (FCC) structure, Cr-rich α' phase and NiAl-rich phase with BCC structure, and NiMo-rich phase with hexagonal close-packed (HCP) structure. The precipitation mechanisms of these phases were discussed based on experimental results. This study reveals the key role of synergistic strengthening from multiphase precipitation in MPEA, supplying the theoretical foundation for designing innovative MPEA.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"54 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144319403","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Unraveling mechanism of structural transformation from D022-Al3Y to L12-Al3(Y, Zr) phase by inward diffusion of Zr and anti-phase boundary in the Al-Zr-Y alloy at elevated temperature","authors":"Yong-You Kim, Kwangjun Euh, Hyeon-Woo Son","doi":"10.1016/j.jmst.2025.06.003","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.06.003","url":null,"abstract":"The Y element preferentially forms the brittle D0-type Al<sub>3</sub>Y phase rather than the L1<sub>2</sub>-Al<sub>3</sub>Y phase, challenging to utilize the Al<sub>3</sub>Y phase as an L1<sub>2</sub>-structural phase. However, a few studies have reported the presence of L1<sub>2</sub>-Al<sub>3</sub>(M, Y) phases induced by the multi-addition of Y with L1<sub>2</sub> phase-stable elements. It is still unclear how the multi-addition of Y with L1<sub>2</sub> phase-stable element facilitates to precipitate preferentially L1<sub>2</sub> phase rather than D0-type Al<sub>3</sub>Y phase, to date. This study investigated the mechanism of irreversible structural transformation of the Al<sub>3</sub>Y phase from equilibrium D0-type phase to metastable L1<sub>2</sub> phase by economically viable L1<sub>2</sub> phase-stable Zr element in Al-Zr-Y alloy at elevated temperature, using transmission electron microscopy. The results demonstrate that the inward diffusion of the Zr element into the D0-type phase stabilizes the Al<sub>3</sub>Y phase to the L1<sub>2</sub>-Al<sub>3</sub>(Zr, Y) phase as aging progresses, indicating an irreversible structural transformation from the D0-type phase to the L1<sub>2</sub> phase induced by Zr diffusion as well as anti-phase boundary (APB). The APB helps pipe diffusion of Zr to the adjacent D0<sub>22</sub> phase, thereby accelerating the kinetic process of this structural transformation better than inward diffusion of Zr atoms without APB. The movement of APB provides the driving force for local structural transformation from D0-type Al<sub>3</sub>Y to L1<sub>2</sub>-Al<sub>3</sub>(Zr, Y) phase by rearrangement of the atomic configuration of the D0<sub>22</sub> structure at the vicinity of the APB layer. This rearrangement of atomic configuration synergistically acts for the phase transformation with the Zr pipe diffusion. The above statement is supported by the presence of additional L1<sub>2</sub> atomic layers between the APB and D0-type phase observed at the structural transition point, providing direct evidence for a local irreversible structural transition.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"24 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144296235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}