Materials Science and Engineering: A最新文献_第3页

Achieving balanced strength and toughness in 2.5Ni-Cr-Mo steel via submerged arc additive manufacturing by regulating intrinsic heat treatment 通过调节本质热处理，采用埋弧增材制造技术实现2.5Ni-Cr-Mo钢强度和韧性的平衡

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-25 DOI: 10.1016/j.msea.2025.148849

Yuhang Li , Xi Zhang , Fangjie Cheng

{"title":"Achieving balanced strength and toughness in 2.5Ni-Cr-Mo steel via submerged arc additive manufacturing by regulating intrinsic heat treatment","authors":"Yuhang Li , Xi Zhang , Fangjie Cheng","doi":"10.1016/j.msea.2025.148849","DOIUrl":"10.1016/j.msea.2025.148849","url":null,"abstract":"<div><div>Submerged arc additive manufacturing (SAAM) is attractive for the production of large-size, medium-complex parts. The approach enables the manipulation of ‘full-layer-penetrated’ intrinsic heat treatment (IHT) and thus the resulting metal's microstructure, by controlling the processing parameters. We recently found that this IHT can trigger repeated recrystallizations involved with allotropic transformation in the high-strength low-alloy steel. Here, we report a 2.5Ni-Cr-Mo steel, inherently sensitive to grain boundary-segregated impurities and blocky martensite/austenite (M/A) phase, of which microstructure and properties are tailor-designed via SAAM. The α-Fe phase matrix of this steel is refined in situ by multiple recrystallization whilst impurities are desegregated as the prior-γ grain boundaries disappeared. M/A phase is then finer and is deliberately dispersed via in situ element partitioning, followed by an long-duration tempering. Control of multiple recrystallization, impurity desegregation and dispersion of M/A phase leads to a near homogeneous microstructure, enabling the substantial improvement on impact toughness (∼9 J–∼42 J at −60 °C, for half-sized specimen). Our material has a tensile strength of 820 MPa, yield ratio of 0.65–0.72, and ductile-brittle transition temperature of −80 °C, exhibiting superior mechanical properties to those of common engineering steels. SAAM approach and the principles of in situ microstructure control provides new idea and avenues for new additive manufacturing and the development of heavyweight steel parts for various industrial applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148849"},"PeriodicalIF":7.0,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724642","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}

引用次数: 0

Superior coarsening resistance and elevated-temperature mechanical stability in L12-strengthened high-entropy alloy under long-time thermal exposure l12强化高熵合金在长时间热暴露下具有优异的抗粗化性能和高温机械稳定性

IF 6.1 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-25 DOI: 10.1016/j.msea.2025.148869

Zhuqun Zhang , Jingyu Pang , Yitong Yang , Zhenqiang Xing , Long Zhang , Yuan Sun , Aimin Wang , Hongwei Zhang

{"title":"Superior coarsening resistance and elevated-temperature mechanical stability in L12-strengthened high-entropy alloy under long-time thermal exposure","authors":"Zhuqun Zhang , Jingyu Pang , Yitong Yang , Zhenqiang Xing , Long Zhang , Yuan Sun , Aimin Wang , Hongwei Zhang","doi":"10.1016/j.msea.2025.148869","DOIUrl":"10.1016/j.msea.2025.148869","url":null,"abstract":"<div><div>The microstructural and mechanical stability of high-temperature structural materials under prolonged high-temperature exposure critically governs their in-service performance and operational reliability. In this study, we developed a novel L1<sub>2</sub>-nanoparticle-strengthened high-entropy alloy (HEA) and quantitatively investigated the evolution of its grain size, L1<sub>2</sub> precipitates, and grain boundary (GB) precipitation during isothermal aging at 750 °C. Results reveal that the developed HEA maintains exceptional microstructural stability, with limited grain size fluctuation, slow coarsening kinetics (coarsening rate constant of 1.64 × 10<sup>−29</sup> m<sup>3</sup>/s), and minimal topologically close-packed (TCP) precipitates at GBs (<0.31 %) after 2000 h aging. Notably, the coarsening kinetics of L1<sub>2</sub> precipitates in this HEA are significantly lower than those of other L1<sub>2</sub>-strengthened HEAs and typical Ni-based superalloys. The superior microstructural stability of HEA ensures remarkable mechanical stability over a wide temperature range. Despite inducing trace TCP phase precipitation that reduces high-temperature elongation below 3 % after the aging time of 500 h, extended aging time restores ductility while maintaining yield strength above 700 MPa, demonstrating exceptional mechanical stability under long-time aging. This study validates HEAs' exceptional microstructure and mechanical stability at high temperatures, highlighting its potential for advanced high-temperature structural applications.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"943 ","pages":"Article 148869"},"PeriodicalIF":6.1,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144704432","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}

引用次数: 0

Biodegradable Mg-Fe interpenetrating-phase composites by reactive melt infiltration 反应熔体渗透的可降解Mg-Fe互渗相复合材料

IF 6.1 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-25 DOI: 10.1016/j.msea.2025.148876

Qiyue Zhang , Tao Yan , Yujing Tong , Ming Zhang , Shaogang Wang , Lili Tan , Qiang Wang , Zengqian Liu , Zhefeng Zhang , Dan Zhang

引用次数: 0

Effect of nano-WC reinforcement on high temperature mechanical properties and fracture mechanism of GH3536 deposited by oscillating laser 纳米wc增强对振荡激光沉积GH3536高温力学性能及断裂机理的影响

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-25 DOI: 10.1016/j.msea.2025.148845

Jingze Wu , Yining Hu , Peipei Sun , Lei Zhu , Tao Wang

{"title":"Effect of nano-WC reinforcement on high temperature mechanical properties and fracture mechanism of GH3536 deposited by oscillating laser","authors":"Jingze Wu , Yining Hu , Peipei Sun , Lei Zhu , Tao Wang","doi":"10.1016/j.msea.2025.148845","DOIUrl":"10.1016/j.msea.2025.148845","url":null,"abstract":"<div><div>The GH3536 pure alloy and nano-WC/GH3536 composite material were fabricated using the circular oscillating laser deposition technique. Their microstructure, room temperature (25 °C) and high temperature (980 °C) tensile properties, as well as crack and fracture morphology, were comprehensively analyzed. The results showed that at 25 °C, compared with the pure alloy, the composite material exhibited a 17 % increase in yield strength, a 7 % decrease in fracture strength, and a 95 % reduction in fracture elongation. At 980 °C, the WC/GH3536 composite demonstrated a 9 % increase in yield strength, a 14 % increase in fracture strength, and a 46 % improvement in fracture elongation, compared to the pure alloy. Fracture morphology analysis revealed that with increasing temperature, the fracture mechanism of the pure alloy transitioned from ductile to brittle, while the WC/GH3536 composite toughness has improved. This change is attributed to different grain growth patterns in the pure alloy and WC/GH3536 composite at 980 °C. The pure alloy's microstructure, initially composed of fine and regular crystal cells, transformed into large grains with different orientations. The precipitation phase is discontinuous, leading to intergranular fracture. In contrast, the WC/GH3536 composite's microstructure, reinforced by the precipitation of additional W-rich carbides, strengthened the existing precipitate network, thus preventing intergranular fracture.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148845"},"PeriodicalIF":7.0,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721498","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}

引用次数: 0

On the role of Zn addition in dispersoid precipitation and associated mechanical properties of Al-Mg-Mn alloy 添加Zn对Al-Mg-Mn合金弥散析出的影响及其力学性能

IF 6.1 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-24 DOI: 10.1016/j.msea.2025.148864

Shihu Hu , Qipeng Dong , Ziwei Yao , Fangzhen Liu , Zhen Li , Lingsen Zeng , Hiromi Nagaumi

{"title":"On the role of Zn addition in dispersoid precipitation and associated mechanical properties of Al-Mg-Mn alloy","authors":"Shihu Hu , Qipeng Dong , Ziwei Yao , Fangzhen Liu , Zhen Li , Lingsen Zeng , Hiromi Nagaumi","doi":"10.1016/j.msea.2025.148864","DOIUrl":"10.1016/j.msea.2025.148864","url":null,"abstract":"<div><div>This study systematically investigates the effects of Zn addition on the precipitation of Mn-rich dispersoids and associated influence on recrystallization resistance and mechanical properties of an Al-Mg-Mn alloy. The results indicate the significant promotion of dispersoids precipitation with Zn addition, with a substantial increase of 237 % in the number density of Mn-rich dispersoids. Moreover, the uniformity of the dispersoids is markedly enhanced. In response to that, the recrystallization resistance and mechanical properties of the alloy were enhanced. The Zn-bearing alloy retained well the fibrous microstructure, while the Zn-free alloy underwent complete recrystallization. An excellent mechanical property was achieved with the Zn addition, exhibiting an ultimate tensile strength of 459.4 MPa and an elongation of 21 %. The improvement in dispersoids precipitation by Zn addition is attributed to the formation MgZn phase during heating process of homogenization, which provides heterogeneous nucleation sites for the Mn-rich dispersoids.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148864"},"PeriodicalIF":6.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713322","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}

引用次数: 0

Unraveling the role of particle size distribution in the cyclic hardening and softening mechanisms of alloy 718Plus during LCF at room temperature and 650 °C under plastic strain control 在室温和650℃塑性应变控制下，揭示718Plus合金在LCF循环硬化和软化过程中粒径分布的作用

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-24 DOI: 10.1016/j.msea.2025.148863

Barun Bharadwaj Dash , Shubhashis Dixit , M. Sundararaman , R. Brandt , H.-J. Christ , S. Sankaran

{"title":"Unraveling the role of particle size distribution in the cyclic hardening and softening mechanisms of alloy 718Plus during LCF at room temperature and 650 °C under plastic strain control","authors":"Barun Bharadwaj Dash , Shubhashis Dixit , M. Sundararaman , R. Brandt , H.-J. Christ , S. Sankaran","doi":"10.1016/j.msea.2025.148863","DOIUrl":"10.1016/j.msea.2025.148863","url":null,"abstract":"<div><div>The effect of particle size distribution on the cyclic deformation mechanisms in alloy 718Plus has been examined in the unimodal (U<sub>STD</sub>) and the bimodal (B<sub>SD</sub>) γʹ distributions under fully reversed low cycle fatigue at room temperature (RT) and 650 °C. The U<sub>STD</sub> specimens depicted a short initial hardening followed by an extensive but gradual cyclic softening, while the B<sub>SD</sub> specimens manifested prolonged hardening followed by a brief yet steep softening response. This contrasting stress response behavior has been explained on the basis of the dislocation–precipitate interaction mechanisms through interrupted LCF specimens, deformed till 25 cycles at 0.15 % plastic strain amplitude at both temperatures. The extended softening in U<sub>STD</sub> specimens occurred due to the weakly coupled dislocation shearing, which required lower shear stress, leading to faster fragmentation and dissolution of the unimodal precipitates, generating γ′-free bands. However, a higher CRSS was needed for the strongly coupled dislocations to shear the bimodal distribution, resulting in delayed softening. Although the extent of overall softening was reduced, the cyclic softening rate (per cycle) increased as a function of the plastic strain amplitude and temperature for both U<sub>STD</sub> and B<sub>SD</sub> specimens.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148863"},"PeriodicalIF":7.0,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144738011","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}

引用次数: 0

Mechanical and microstructural behavior of friction stir powder additive manufactured ceria-stabilized zirconia and polymer-derived ceramic reinforced AA7075 composites 搅拌摩擦粉添加剂制备的氧化锆和聚合物陶瓷增强AA7075复合材料的力学和微观结构行为

IF 6.1 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-24 DOI: 10.1016/j.msea.2025.148859

Nisar Ahamad Khan , Bhavesh Chaudhary , Dipayan Chakraborty , Ardula Gourav Rao , Ajay Kumar

{"title":"Mechanical and microstructural behavior of friction stir powder additive manufactured ceria-stabilized zirconia and polymer-derived ceramic reinforced AA7075 composites","authors":"Nisar Ahamad Khan , Bhavesh Chaudhary , Dipayan Chakraborty , Ardula Gourav Rao , Ajay Kumar","doi":"10.1016/j.msea.2025.148859","DOIUrl":"10.1016/j.msea.2025.148859","url":null,"abstract":"<div><div>Fusion-based additive manufacturing of Al-based composites faces challenges such as oxidation, hot cracking, metallurgical incompatibility, and brittle intermetallic formation due to liquid-solid phase transformations. Solid-state friction stir-based AM processes, on the other hand, minimize these issues but are limited by the availability of suitable feedstock forms, especially for manufacturing composites. Recently developed friction stir powder additive manufacturing (FSPAM) is an emerging solid-state additive manufacturing process that reduces solidification-related issues and overcomes feedstock limitations by using readily available powders, allowing easy preparation of composite feedstocks through powder mixing. This study investigates ceria-stabilized zirconia and polymer-derived ceramic-reinforced AA7075 composites manufactured using the FSPAM process. Microstructure confirmed a uniform, defect-free deposition having fine grains of size 6.4 ± 2.9μm and 58 % high-angle grain boundaries, indicating significant grain refinement due to dynamic recrystallization. The reinforcement particles refined the microstructure through the Zener pinning effect, while <em>η</em> and <em>S</em> precipitates (∼45 nm size) enhanced mechanical strength by inhibiting grain coarsening. The composite exhibited a yield strength of 223 ± 7 MPa, an ultimate tensile strength of 393 ± 3 MPa, and a microhardness of 125 ± 9 HV, closely matching AA7075-T4 alloys. However, elongation was limited to 5.5 ± 0.4 %, possibly due to localized agglomeration of reinforced particles. These findings highlight FSPAM as a promising process in solid-state AM of Al-based composites for high-strength and high-temperature applications, though further research is needed to address geometric constraints for broader industrial adoption.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148859"},"PeriodicalIF":6.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713564","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}

引用次数: 0

Hydrogen embrittlement of duplex stainless steel: Effect of tensile prestrain 双相不锈钢的氢脆：拉伸预应变的影响

IF 6.1 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-24 DOI: 10.1016/j.msea.2025.148855

Weijie Wu , Zhicheng Fang , Yawei Peng , Chenwei Xia , Jian Wang , Jianming Gong , Jinxu Li

{"title":"Hydrogen embrittlement of duplex stainless steel: Effect of tensile prestrain","authors":"Weijie Wu , Zhicheng Fang , Yawei Peng , Chenwei Xia , Jian Wang , Jianming Gong , Jinxu Li","doi":"10.1016/j.msea.2025.148855","DOIUrl":"10.1016/j.msea.2025.148855","url":null,"abstract":"<div><div>This study investigates the effect of deformation-induced microstructures on the hydrogen embrittlement (HE) sensitivity of duplex stainless steel (DSS). By varying the pre-strain temperature (room temperature and 80 °C) and strain level (5–15 %), the microstructural evolution—particularly the distribution of geometrically necessary dislocations (GNDs) in ferrite phase and deformation twins in austenite phase was tailored. Slow strain rate tensile testing (5 × 10<sup>−6</sup> s<sup>−1</sup>) under in-situ hydrogen charging revealed that prestraining mitigates HE sensitivity, with the degree of improvement depending on temperature and strain level. For room-temperature pre-straining, the HE sensitivity decreased by 31–34 % at 5–10 % strain, but only by 15 % at 15 % strain. In contrast, pre-straining at 80 °C led to a modest reduction (∼10 %) at 5–10 % strain, but a more pronounced decrease (∼32 %) at 15 % strain. Notably, samples pre-strained at 80 °C with 5–10 % strain showed a strength–ductility product comparable to that of the annealed material under hydrogen charging, but with a markedly higher strength (over 40 % increase). The improved HE resistance is primarily attributed to the formation of dense GND networks, which act as strong hydrogen traps, thereby limiting hydrogen concentration at crack tips. In contrast, a high pre-strain level (15 %) applied at room temperature promotes extensive deformation twinning and slip bands in austenite, which facilitates hydrogen-assisted cracking and thus reduces HE resistance.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"943 ","pages":"Article 148855"},"PeriodicalIF":6.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144703317","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}

引用次数: 0

The effect of dispersed Ni particles on the microstructure and performance evolution of 3D Ni network reinforced Ag-based contact materials during hot extrusion 热挤压过程中分散Ni颗粒对三维Ni网络增强ag基接触材料组织和性能演变的影响

IF 6.1 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-24 DOI: 10.1016/j.msea.2025.148871

Tianjie Zheng , Zhijie Lin , Songyu Li , Jinlong Wang , Jianeng Huang , Xinyang Xu , Xudong Sun , Pinqiang Dai

{"title":"The effect of dispersed Ni particles on the microstructure and performance evolution of 3D Ni network reinforced Ag-based contact materials during hot extrusion","authors":"Tianjie Zheng , Zhijie Lin , Songyu Li , Jinlong Wang , Jianeng Huang , Xinyang Xu , Xudong Sun , Pinqiang Dai","doi":"10.1016/j.msea.2025.148871","DOIUrl":"10.1016/j.msea.2025.148871","url":null,"abstract":"<div><div>A microstructure-controllable Ag-Ni composite in plastic deformation is of great significance to its mechanical and electrical performance. In this study, AgNi sintered ingots reinforced with 10 wt% of a continuous three-dimensional (3D) Ni network and different quantities of dispersed Ni particles were prepared. Subsequently, AgNi composites were obtained by hot extrusion at 800 °C. The 3D Ni network was initially elongated in the axial direction and then fragmented in the radial direction, accompanied by the formation of Ni belts with {110}<111> texture and the development of a Ag/<100> texture. However, at high true strains, the Ni belts were recrystallized into spindle/tadpole shapes. The Ni particles dispersed in Ag-rich matrix improved the elastic modulus of the Ag-rich matrix via the mixing rule, grain refinement, and dislocation pile-up, resulting in enhanced load transfer and cooperative deformation between the Ag-rich matrix and the Ni network. Therefore, the addition of a small quantity (0.5 wt%) of dispersed Ni particles is beneficial for obtaining Ag-based electrical contact materials reinforced with long Ni belts (1200–1800 μm in length and ∼20 μm in thickness), which exhibit a low mass loss (2.02 mg) after 100,000 contacts at 24 V/10 A of direct current.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148871"},"PeriodicalIF":6.1,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713562","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}

引用次数: 0

Effects of Al addition on microstructure and mechanical properties of a novel FeNi2VAlx high-entropy alloy system Al添加对新型FeNi2VAlx高熵合金体系组织和力学性能的影响

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2025-07-23 DOI: 10.1016/j.msea.2025.148862

Xiaoya Liu , Yongkang Zhou , Jingqian Chen , Huameng Fu , Haifeng Zhang , Yingjie Ma , Zhengwang Zhu

{"title":"Effects of Al addition on microstructure and mechanical properties of a novel FeNi2VAlx high-entropy alloy system","authors":"Xiaoya Liu , Yongkang Zhou , Jingqian Chen , Huameng Fu , Haifeng Zhang , Yingjie Ma , Zhengwang Zhu","doi":"10.1016/j.msea.2025.148862","DOIUrl":"10.1016/j.msea.2025.148862","url":null,"abstract":"<div><div>Multi-phase high-entropy alloys (HEAs) exhibiting an exceptional strength-ductility synergy represent a novel paradigm in advanced alloy design. In this study, a series of FeNi<sub>2</sub>VAl<sub>x</sub> (x = 0, 0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1) HEAs were designed and fabricated, and the effects of Al addition on the phase formation and mechanical properties were systematically investigated. With Al content increasing, the phase constitution in this alloy system evolves from a single face-centered cubic (FCC) phase to a mixture of FCC and L2<sub>1</sub> phase – an ordered body-centered cubic (BCC) derived phase, and finally to a single L2<sub>1</sub> phase. There is a localized short-range ordered L1<sub>2</sub> structure in the FCC phase in the alloys with high Al concentration, and the L2<sub>1</sub> phase in this series of alloys exhibits antiphase domains (APDs) structure, confirming its long-range periodicity. The increasing Al addition leads to the improvement of the strength of the alloys, yield strength from 303 to 1115 MPa, and ultimate tensile strength from 565 to 1407 MPa. The Al0.6 alloy achieves an excellent strength-ductility balance (761 MPa yield strength, 1194 MPa ultimate tensile strength, and 21.2 % elongation) due to the following combined strategy: synergistic FCC/L2<sub>1</sub> phase deformation, Taylor lattices, high-density dislocation walls, and FCC stacking faults, which collectively optimize strain hardening and dislocation restriction. This study provides essential insights into the strategic design of multi-phase HEA structures, enabling the achievement of an extraordinary strength-ductility synergy.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"944 ","pages":"Article 148862"},"PeriodicalIF":7.0,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144721500","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}

引用次数: 0