Metals and Materials International最新文献

{"title":"One-Step Modulation of Pores to Enhance the Corrosion Resistance of Plasma Electrolytic Oxide Coatings","authors":"Xiaoting Liu,&nbsp;Guofeng Ma,&nbsp;Zhanpeng Li,&nbsp;Yuan Sun","doi":"10.1007/s12540-025-02105-4","DOIUrl":"10.1007/s12540-025-02105-4","url":null,"abstract":"<div><p>Using plasma electrolytic oxidation, various additives were doped into a silicate-based electrolyte to regulate the pore size of the resulting coatings. We successfully prepared Al₂O₃-based ternary composite coatings on 17% SiCp/2009 aluminum matrix composites, and systematically investigated the effects of metal soluble salts and rare earth soluble salts (Y(NO₃)₃·6H₂O, Eu(NO₃)₃·6H₂O, Ce(NO₃)₃·6H₂O, and K₂ZrF₆) on the phase structure and surface morphology of the PEO coatings. Their corrosion resistance was also evaluated via electrochemical workstation tests and ultrasonic cavitation corrosion tests. Among the ternary composite coatings obtained, those with K₂ZrF₆ added showed a significant reduction in pore size—from 2.49 ± 0.06 to 1.50 ± 0.01 μm—and in porosity, from 7.10 ± 0.47 to 2.93 ± 0.36%—more notable than with the other three rare earth additives. Electrochemical tests revealed that coatings with K₂ZrF₆ and Ce(NO₃)₃·6H₂O had corrosion current densities an order of magnitude lower than other groups; the K₂ZrF₆-added coating had a density of 2.38 × 10⁻⁷ and a 0.2 V positive shift in corrosion potential. ZrO₂–SiO₂–Al₂O₃ coatings exhibited the best corrosion resistance, with CeO₂–SiO₂–Al₂O₃ performed best among rare earth-based coatings. In summary, regulating pore size and porosity positively enhances PEO coating corrosion resistance.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 7","pages":"2376 - 2389"},"PeriodicalIF":4.5,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147333437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Corrosion Behavior of FexCrMnAlCu High-Entropy Alloy in 0.5 M H2SO4 Solution","authors":"Junpeng Cui,&nbsp;Li Feng,&nbsp;Chao Ma,&nbsp;Zhaoqing Wang,&nbsp;Yanchun Zhao","doi":"10.1007/s12540-025-02072-w","DOIUrl":"10.1007/s12540-025-02072-w","url":null,"abstract":"<div><p>Fe_xCrMnAlCu (x = 0, 0.5, 1.0, 1.5, 2.0 wt%) high-entropy alloys (HEAs) were synthesized via vacuum arc melting to investigate the Fe-induced microstructural evolution and corrosion mechanisms in 0.5 M H₂SO₄ solution. The results demonstrate that increasing the Fe content progressively transforms the phase structure of the Fe_xCrMnAlCu HEAs from an initial BCC + BCC2(L2₁) configuration to an FCC + BCC structure. Microstructural analysis revealed that the dendritic regions primarily consist of Cr, Fe, Mn, and Al-enriched solid solutions, while the interdendritic regions comprise Cu and Al-enriched solid solutions. The addition of Fe promotes the formation of the FCC phase while simultaneously inhibiting the precipitation of the L2₁ phase. Immersion corrosion tests and electrochemical measurements indicate that the corrosion resistance of the Fe_xCrMnAlCu HEAs exhibits a graded degradation with increasing Fe content (Fe₀ &gt; Fe_0.5 &gt; Fe_1.0 &gt; Fe_1.5 &gt; Fe_2.0). The Fe₀ alloy demonstrated the optimal corrosion resistance, characterized by the highest corrosion potential and the lowest corrosion current density. This superior performance is attributed to its unique BCC + BCC2(L2₁) dual-phase structure and the formation of a stable, compact passive film during corrosion. In contrast, the Fe_0.5 alloy failed to develop a dense and stable passive film. Localized corrosion pits were observed on the dendritic regions of the Fe_1.0 alloy, while the Fe_1.5 and Fe₂.₀ alloys underwent severe selective dissolution of the dendritic phase. The deterioration in corrosion performance primarily stems from the synergistic effects of: (i) alterations in passive film characteristics induced by Fe addition, (ii) enhanced microgalvanic coupling resulting from the phase transition (BCC + L2₁ → FCC + BCC), and (iii) dilution of the critical corrosion-resistant element Cr, which significantly weakens the passivation capability of the dendritic regions.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 5","pages":"1572 - 1590"},"PeriodicalIF":4.0,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tribological Behaviour of AZ91M Magnesium Alloy Fabricated by CMT-WAAM Under Varying Heat Inputs","authors":"Bappa Das,&nbsp;Shakti Kumar,&nbsp;Bishub Choudhury,&nbsp;Govind Kumar,&nbsp;Anubhav Singh,&nbsp;Sumit Kumar Sinha","doi":"10.1007/s12540-025-02115-2","DOIUrl":"10.1007/s12540-025-02115-2","url":null,"abstract":"<div><p>This work explores the tribological performance of AZ91M magnesium alloy fabricated via Cold Metal Transfer–Wire Arc Additive Manufacturing (CMT-WAAM) under varied heat input conditions. As a lightweight structural material, AZ91M offers excellent strength and corrosion resistance but poses fabrication challenges due to its hexagonal close-packed structure and thermal sensitivity. The CMT-WAAM technique provides a promising pathway to overcome these limitations, enabling precise heat control and near-net-shape manufacturing. Three distinct heat inputs—low, medium, and high—were investigated to assess their influence on microstructure, mechanical response, and wear resistance. Results revealed that medium heat input led to refined equiaxed grains and uniform β-Mg₁₇Al₁₂ and η-Al₈Mn₅ phase distribution, while both low and high inputs resulted in coarser or segregated structures. Mechanical analysis confirmed that medium heat input yielded an ultimate tensile strength of 425 MPa, compressive strength above 500 MPa, and average hardness of ~ 95 HV, compared to 370–390 MPa tensile strength and 80–88 HV hardness under low and high heat inputs. Tribological tests demonstrated that medium heat input provided a ~ 23% reduction in wear mass loss and ~ 31% lower coefficient of friction, together with a lower temperature rise during sliding. These improvements are attributed to improved phase stability and surface integrity. FESEM analysis of worn surfaces and debris supports a transition in wear mechanisms-from brittle fracture and delamination at extreme heat inputs to stable abrasive wear with plastic deformation under medium heat input condition.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 7","pages":"2527 - 2560"},"PeriodicalIF":4.5,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268760","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Advancements in Fabrication Techniques and their Impact on the Properties of Titanium-Based Medium Entropy Alloys for Extreme Environment Applications: A Review","authors":"Kazeem Oladiti Sanusi,&nbsp;Nicholus Malatji,&nbsp;Samson Olaitan Jeje,&nbsp;Lehlogonolo Rudolf Kanyane,&nbsp;Mxolisi Brendon Shongwe","doi":"10.1007/s12540-025-02071-x","DOIUrl":"10.1007/s12540-025-02071-x","url":null,"abstract":"<div><p>Titanium-based medium entropy alloys (MEAs) have emerged as a promising class of materials for high-temperature applications because of their distinct combination of superior mechanical characteristics, oxidation resistance, and thermal stability. This review explores the fabrication techniques, microstructural features and mechanical performance of titanium-based MEAs, highlighting their potential in industries such as energy, automotive, and aerospace. Alloying elements are discussed in terms of their influence on the mechanical strength, creep resistance, and phase stability of these alloys. The review also examines the role of various fabrication methods, including arc melting, powder metallurgy, additive manufacturing, and mechanical alloying, in tailoring the microstructure and enhancing the performance of titanium-based MEAs. Challenges in fabricating titanium-based MEAs. Furthermore, the review highlights emerging trends in MEA research, including alloy optimization, surface modification strategies, and the integration of computational modelling and machine learning. Despite the promising advantages, significant research is required to overcome the current limitations and further enhance the performance and sustainability of titanium-based MEAs for high-temperature applications.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 5","pages":"1375 - 1407"},"PeriodicalIF":4.0,"publicationDate":"2025-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s12540-025-02071-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147667873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Influence of Deposition Methods on the Microstructural Evolution and Oxidation Behavior at 800 °C of FeCrAlY Coatings on Lightweight Steel","authors":"Hyungkwon Park,&nbsp;Hunkwan Park,&nbsp;Hyunwook Cho,&nbsp;Hansol Kwon","doi":"10.1007/s12540-025-02110-7","DOIUrl":"10.1007/s12540-025-02110-7","url":null,"abstract":"<div><p>In this study, FeCrAlY protective coatings were deposited onto lightweight steel substrates using three thermal spray techniques: atmospheric plasma spraying (APS), high-velocity oxy-fuel spraying (HVOF), and cold spraying (CS). The as-deposited microstructures were examined by field emission scanning electron microscopy (FE-SEM), and mechanical performance was assessed through Vickers hardness and adhesion strength measurements. Isothermal oxidation tests were further conducted at 800 °C for 1,000 h to evaluate long-term oxidation resistance. Mechanical characterization revealed that HVOF and CS coatings significantly improved the surface hardness of lightweight steel, while APS resulted in a decrease. Adhesion testing indicated that HVOF achieved the highest bond strength, whereas APS and CS showed comparable but lower levels, with distinct failure modes associated with each deposition method. Oxidation analysis demonstrated that APS coatings, due to pre-oxides, porosity, and lack of free Al, formed irregular and non-protective oxides, leading to pronounced internal oxidation. In contrast, both HVOF and CS coatings produced dense microstructures capable of sustaining protective alumina scales, which effectively suppressed internal oxidation and retained residual Al even after prolonged exposure. The comparative findings clearly establish that the deposition process strongly influences the balance between mechanical properties and oxidation performance of FeCrAlY coatings. These insights provide important guidelines for optimizing thermal spray processes to achieve superior durability and reliability of lightweight steel in demanding high-temperature environments.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 7","pages":"2390 - 2406"},"PeriodicalIF":4.5,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Strength Evolution in Ti4Al3V-xFe Alloys Obtained by Dual-Wire Electron Beam Additive Manufacturing","authors":"Aleksandra Nikolaeva,&nbsp;Anna Zykova,&nbsp;Andrey Vorontsov,&nbsp;Aleksander Panfilov,&nbsp;Evgenii Kuzminov,&nbsp;Denis Gurianov,&nbsp;Angelina Gusarenko,&nbsp;Nickolai Savchenko,&nbsp;Evgeny Kolubaev,&nbsp;Sergei Tarasov","doi":"10.1007/s12540-025-02106-3","DOIUrl":"10.1007/s12540-025-02106-3","url":null,"abstract":"<div><p>The present study provides the first systematic investigation of Fe addition (1.7–7.5 wt%) in Ti4Al3V alloy fabricated by WEBAM, focusing on constitutional supercooling-induced grain refinement, β-phase stabilization, and isothermal ω-phase precipitation. Achieving refined equiaxed prior β-Ti microstructures in titanium alloys via electron beam additive manufacturing remains challenging due to epitaxial grain growth under slow cooling, which results in columnar grain growth. Alloying with β-stabilizing elements such as Fe offers a promising route to overcome this limitation by promoting constitutional supercooling and limiting the epitaxial grain growth mechanism. In this paper, the structural and phase evolution of Ti4Al3V-Fe alloys containing 1.7, 2.5, and 7.5 wt% Fe and produced by dual-wire electron beam additive manufacturing (WEBAM) has been investigated. The addition of 1.7 to 2.5 wt% Fe resulted in the refinement of prior β-Ti grains with a simultaneous reduction of their aspect ratio as well as the formation of α/β(Fe) lath structures. Ultimate tensile strength and yield stress improved to 785 MPa and 725 MPa on adding 1.7 wt% Fe. Ti4Al3V-2.5 wt% Fe alloy possessed even higher ultimate tensile strength and yield stress values, i.e., 1064 MPa and 990 MPa, respectively. The addition of 7.5 wt% β-supporting Fe allowed the formation of structures with 81 vol% β(Fe)-Ti and elliptical ω-Ti precipitates with grain boundary fine lath α-Ti. The Ti4Al3V-7.5 wt% Fe alloy exhibited higher hardness compared to that of the as-built Ti4Al3V and was characterized by brittle fracture in tensile testing as a result of ω-embrittlement.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 7","pages":"2435 - 2458"},"PeriodicalIF":4.5,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electropulse Assisted Tensile Toughness Improvement in Low Density Austenitic Duplex Steel","authors":"Rajavarapu Pavan Kumar,&nbsp;N. C. Santhi Srinivas,&nbsp;R. Manna","doi":"10.1007/s12540-025-02079-3","DOIUrl":"10.1007/s12540-025-02079-3","url":null,"abstract":"<div><p>This study investigates the impact of electropulsing (EP) treatment on the microstructure and tensile properties of aged austenitic low-density duplex steel with a Fe-18Mn-10.5Al-1C-6Ni composition. The base alloy, excluding Mn, is melted at 1600 °C via induction heating under vacuum. Mn is later added at 1560 °C in argon, and the melt is cast into plates using a copper mold. The cast alloy undergoes homogenization, hot rolling, annealing, and aging to develop B2 phase and κ-carbide within an austenitic matrix, achieving a yield strength of 1224 MPa, tensile strength of 1430 MPa, and 10.3% plastic elongation. Electropulsing (EP) treatment partially dissolves and spheroidizes coarse B2 and κ-carbides by lowering interfacial energy via electron wind, while simultaneously promoting recrystallization of B2 and austenite below their equilibrium solvus. As a result, B2 is refined with a 2% reduction in volume fraction, and κ-carbide content decreases by 1.5%. Tensile testing indicates a 6% increase in total elongation and a 47% enhancement in tensile toughness, accompanied by a marginal decrease in yield and ultimate tensile strengths. The improved ductility is linked to carbide dissolution, B2 refinement, and a higher proportion of high-angle grain boundaries, while reduced κ-carbide content accounts for the strength decline.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 6","pages":"1996 - 2019"},"PeriodicalIF":4.0,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060678","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Enhanced Cryogenic Strength of a Dual-Phase TRIP-Assisted High Entropy Alloy","authors":"Yashar M. Sardroudi,&nbsp;Amin Radi,&nbsp;Farahnaz Haftlang,&nbsp;Hyoung Seop Kim,&nbsp;Guney Guven Yapici","doi":"10.1007/s12540-025-02080-w","DOIUrl":"10.1007/s12540-025-02080-w","url":null,"abstract":"<div><p>This study investigates the influence of deformation temperature on the microstructural evolution and mechanical performance of a dual-phase high-entropy alloy subjected to cold rolling after annealing at 750 °C for 30 min. Unlike the homogenized alloy, which exhibits a single-phase face-centered cubic structure, the processed condition develops a dual-phase microstructure with the inclusion of body-centered cubic phases. Uniaxial tensile experiments were conducted across a wide temperature range to evaluate the mechanical response. These results were correlated with microstructural observations to elucidate the underlying deformation mechanisms and guide property optimization. While the coarse-grained homogenized condition exhibited no phase transformation during deformation, the refined dual-phase structure demonstrated strain-induced phase transformation with its extent strongly dependent on the deformation temperature. Notably, the microstructure obtained after thermomechanical processing demonstrated enhanced transformation-induced plasticity effect at lower temperatures, achieving a tensile strength exceeding 1600 MPa and a failure elongation of approximately 18% under cryogenic conditions.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 6","pages":"1880 - 1890"},"PeriodicalIF":4.0,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148060679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation on Interface Corrosion Behavior and Mechanism of AA7075/316 l Composites Prepared by Friction Stir Additive Manufacturing","authors":"Dingyao Fu,&nbsp;Chengbo Li,&nbsp;Xuejun Zheng,&nbsp;Shengdan Liu,&nbsp;Tie Yi,&nbsp;Wengang Chen,&nbsp;Xi Xu,&nbsp;Qinyao Chen","doi":"10.1007/s12540-025-02104-5","DOIUrl":"10.1007/s12540-025-02104-5","url":null,"abstract":"<div><p>The microstructure, mechanical properties, and corrosion resistance of friction stir additive manufacturing (FSAM)-produced AA7075/316L composites were investigated via multi-scale characterization, mechanical testing, and electrochemical analysis. The results reveal the formation of an amorphous layer with a thickness of about 100 nm at the interface, accompanied by a small number of intermetallic compounds (IMCs) near the Al side of the amorphous layer. Dynamic recrystallization and recovery phenomena were observed in the AA7075 aluminum alloy under mechanical stirring, leading to significant grain refinement with an average size of 3.3 ± 1.1 μm. Tensile strength and yield strength of composites were 413 MPa and 227 MPa, respectively, with an elongation of 10.9%. The corrosion current density and polarization resistance of composites were 1.35 × 10⁻⁶A/cm² and 1.83 × 10⁴ Ω cm², respectively. In 3.5 wt% NaCl solution at room temperature (25 ℃), there are pitting corrosion and intergranular corrosion on AA7075 aluminum alloy side of the amorphous layer. However, on 316L stainless steel side, no obvious corrosion occurs. The corrosion reaction is predominantly triggered by the synergistic effects of the high corrosion driving force induced by the significant potential difference between AA7075 aluminum alloy and 316L stainless steel, and micro-galvanic corrosion initiated by second-phase particles (MgZn₂, Al₇Cu₂Fe) in the matrix of AA7075 aluminum alloy.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture><span>The alternative text for this image may have been generated using AI.</span></div></div></figure></div></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 7","pages":"2459 - 2476"},"PeriodicalIF":4.5,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Solidification Behavior and Mechanical Properties of large-sized (CrCoNi)94Al3Ta3 Medium Entropy Alloy","authors":"Jiebo Lu,&nbsp;Minxu Zhou,&nbsp;Tengfei Ma,&nbsp;Xiaohong Wang,&nbsp;Ao Li,&nbsp;Yunting Su","doi":"10.1007/s12540-025-02108-1","DOIUrl":"10.1007/s12540-025-02108-1","url":null,"abstract":"<div><p>This study investigated the solidification behavior and mechanical properties of a large-sized (CrCoNi)₉₄Al₃Ta₃ medium-entropy alloy (MEA) fabricated via induction skull melting (ISM). The as-solidified microstructure exhibited a typical dendritic morphology, sensitive to cooling rate. The alloy consisted of a γ-phase matrix (face-centered cubic structure), γ′ precipitates ((Ni, Co)₃(Al, Ta) with L1₂ structure), and Laves phase particles (Co₂Ta with hexagonal close-packed structure). Aluminum (Al) and tantalum (Ta) acted as positive segregation elements, enriching the interdendritic (ID) regions and influencing subsequent solidification and precipitation. Microhardness measurements revealed a significant difference between the dendrite region (DR) (208 HV) and the ID region (272 HV). The alloy demonstrated a compressive yield strength of 540 MPa and exhibited over 70% plastic strain at room temperature. These excellent mechanical properties are attributed to solid solution strengthening, second-phase (γ′ and Laves) strengthening, and heterogeneous structure strengthening.</p><img></div>","PeriodicalId":703,"journal":{"name":"Metals and Materials International","volume":"32 7","pages":"2323 - 2333"},"PeriodicalIF":4.5,"publicationDate":"2025-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148268661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}