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

Subsurface microstructure versus surface topography: Impact on the fatigue strength of stress-relieved Laser Powder Bed Fusion (L-PBF) 316L parts 亚表面微观结构与表面形貌：对应力消除激光粉末床熔化（L-PBF） 316L零件疲劳强度的影响

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-01-29 DOI: 10.1016/j.msea.2026.149826

Marion Auffray , Linamaria Gallegos Mayorga , Franck Morel , Etienne Pessard , Thierry Baffie

{"title":"Subsurface microstructure versus surface topography: Impact on the fatigue strength of stress-relieved Laser Powder Bed Fusion (L-PBF) 316L parts","authors":"Marion Auffray , Linamaria Gallegos Mayorga , Franck Morel , Etienne Pessard , Thierry Baffie","doi":"10.1016/j.msea.2026.149826","DOIUrl":"10.1016/j.msea.2026.149826","url":null,"abstract":"<div><div>The Laser Powder Bed Fusion (L-PBF) process allows to manufacture parts with both a complex geometry and a high mechanical performance. The as-built and net-shape L-PBF 316L stainless steel parts - i.e. without any heat nor surface treatment, have tensile residual stresses, subsurface pores, a rough surface and a contour-core microstructure that synergistically lead to a low fatigue strength. Residual stresses can be relieved with a heat-treatment to enhance the fatigue properties, but the best performance is obtained after machining and polishing. The differences between the polished and the heat-treated net-shape conditions lie in the subsurface microstructure, the surface topography, and the population of subsurface pores. This study aims to quantify the impact of each of these subsurface parameters on the fatigue behaviour. To do so, the subsurface microstructure of the net-shape condition is characterised. Then, uni-axial fatigue tests are carried out on stress-relieved specimens with the following surface conditions: net-shape, partially polished, and “machined and polished”. The Kitagawa-Takahashi representation shows that for defects smaller than <span><math><mrow><mn>200</mn><mspace></mspace><mi>μ</mi><mi>m</mi></mrow></math></span>, the subsurface microstructure is the most influential parameter on the fatigue strength. Conversely, the surface topography has a limited influence. After examining the microstructure surrounding killer defects of both net-shape and polished specimens, the grain size under the surface of all surface conditions is considered in the Kitagawa-Takahashi diagram relatively to the killer defect size: this allows to align the various batches’ results.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"955 ","pages":"Article 149826"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146070970","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

In-situ formation of B2-MoNi and its strengthening mechanisms in vacuum laser welded joints of Mo alloy 钼合金真空激光焊接接头中B2-MoNi的原位形成及其强化机制

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-02-08 DOI: 10.1016/j.msea.2026.149901

Bingxiao Xu , Ruihan Li , Fuyun Liu , Yuxi Yang , Ge Zhang , Jianhui Su , Xiaohui Han , Guolong Ma , Fujia Xu , Caiwang Tan , Xiaoguo Song

{"title":"In-situ formation of B2-MoNi and its strengthening mechanisms in vacuum laser welded joints of Mo alloy","authors":"Bingxiao Xu , Ruihan Li , Fuyun Liu , Yuxi Yang , Ge Zhang , Jianhui Su , Xiaohui Han , Guolong Ma , Fujia Xu , Caiwang Tan , Xiaoguo Song","doi":"10.1016/j.msea.2026.149901","DOIUrl":"10.1016/j.msea.2026.149901","url":null,"abstract":"<div><div>The intrinsic brittleness and ultra-high melting point of molybdenum alloys result in poor weldability, with the tensile strength of welded joints typically falling below 150 MPa. In this work, fine and dispersed B2-type MoNi phases were successfully induced during vacuum laser welding of Mo–5Re tubes by incorporating a nickel foil (0.1 mm thickness), utilizing rapid solidification and in-situ reaction mechanisms. The results showed that the B2-type MoNi phases were distributed along grain boundaries and interdendritic regions, exerting pronounced Zener pinning effects that suppressed grain growth. Additionally, semi-coherent MoNi–Mo interfaces featuring nanoscale transition layers were formed, effectively reducing lattice mismatch. Consequently, the fusion-zone grain size was refined from 125.2 μm to 42.4 μm, and the dislocation density increased by 41%. The finely dispersed MoNi particles acted as secondary-phase strengtheners, cooperatively enhancing joint performance. Therefore, the tensile strength of the welded joint increased from 149 MPa in the Ni-free condition to 373 MPa of the Mo–0.1Ni joint, although excessive Ni caused segregation-assisted coarsening and strength degradation. Quantitative analysis indicated that grain refinement, dislocation strengthening, and MoNi-induced precipitation strengthening contributed comparably to the strength increment, with precipitation strengthening providing the largest share. This study demonstrates that in-situ MoNi formation under vacuum pressure constitutes an effective strategy to overcome weldability constraints in refractory Mo-alloy joints.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"956 ","pages":"Article 149901"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146147403","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

Tuning grain boundary cohesion and plasticity in Mg alloys by grain boundary segregation and deformation mechanism manipulation 通过晶界偏析和变形机制调控镁合金的晶界内聚力和塑性

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-02-10 DOI: 10.1016/j.msea.2026.149910

Huaqiang Zeng , Dongfeng Shi , Biaobiao Yang , Chenying Shi , Jin Zhang

{"title":"Tuning grain boundary cohesion and plasticity in Mg alloys by grain boundary segregation and deformation mechanism manipulation","authors":"Huaqiang Zeng , Dongfeng Shi , Biaobiao Yang , Chenying Shi , Jin Zhang","doi":"10.1016/j.msea.2026.149910","DOIUrl":"10.1016/j.msea.2026.149910","url":null,"abstract":"<div><div>The intrinsic mechanisms by which Zn and Al solute additions increase ductility remain obscure for magnesium (Mg) alloys. Mg-2wt%Zn and Mg-2wt%Al alloys with comparable basal textures and an average grain size of ∼36 μm were prepared in this work. Quasi-in-situ electron backscatter diffraction (EBSD)-assisted slip trace analysis and transmission electron microscopy (TEM) were used to study the slip behavior and crack tendencies of both alloys under varying tensile strains. The accumulation of Zn at grain boundaries strengthens intergranular cohesion, suppressing their inclination to crack during the initial deformation stage and enabling the grain boundaries of Mg-2wt%Zn alloy to withstand higher stresses. Meanwhile, under greater tensile strains, twinning and non-basal slips are progressively triggered in hard grains (which are not favorable for basal slip), and this plays a role in boosting the ductility of the Mg-2wt%Zn alloy. In contrast, the Mg-2wt%Al alloy develops pronounced local stress concentrations during deformation due to low Al segregation at grain boundaries and insufficient activation of secondary deformation mechanisms (e.g., twinning and non-basal slips) in hard grains. These localized stress concentrations progressively intensify with increasing tensile strain, thereby serving as the primary driver for crack initiation and subsequent rapid intergranular crack propagation. These findings reveal the critical role of grain boundary segregation on grain boundary cohesion strength and secondary deformation mechanisms and plasticity, and can help design dilute Mg alloys with superior mechanical performance.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"956 ","pages":"Article 149910"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172769","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

Effect of silicon on microstructure and properties of Cu-Be-Ni-Co alloy during multi-stage thermo-mechanical treatment 多级热处理过程中硅对Cu-Be-Ni-Co合金组织和性能的影响

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-02-10 DOI: 10.1016/j.msea.2026.149909

Wei Chen , Nuoyi Jiang , Xiaoyu Jiang , Tao Zhou , Jing He , Tianyuanye Wu , Meng Wang , Yanbin Jiang , Daibo Zhu , Zhou Li

{"title":"Effect of silicon on microstructure and properties of Cu-Be-Ni-Co alloy during multi-stage thermo-mechanical treatment","authors":"Wei Chen , Nuoyi Jiang , Xiaoyu Jiang , Tao Zhou , Jing He , Tianyuanye Wu , Meng Wang , Yanbin Jiang , Daibo Zhu , Zhou Li","doi":"10.1016/j.msea.2026.149909","DOIUrl":"10.1016/j.msea.2026.149909","url":null,"abstract":"<div><div>Partial substitution of beryllium with low-cost elements, coupled with multi-stage thermo-mechanical treatment, provides a promising pathway for developing high-performance, low-cost beryllium-copper alloys. In this work, the role of Si element in the microstructure and properties of a Cu-Be-Ni-Co alloy during multi-stage thermo-mechanical treatment was investigated, and the underlying mechanism was elucidated. Si addition promotes grain refinement and transforms the strengthening phase from a single γ′-(Ni,Co)Be phase into nanoscale (Ni,Co,Si)Be and δ-(Ni,Co)<sub>2</sub>Si phases. This dual-phase synergistic strengthening effectively suppresses precipitate coarsening during aging. First-principles calculations indicate that Si atoms preferentially occupy Be sites in the (Ni,Co)Be phase, forming strong Si-Ni/Co bonds that lower the precipitate/matrix interfacial energy. Through an optimized multi-stage thermo-mechanical treatment, a novel Cu-1.5Be-0.1Ni-0.3Co-0.2Si alloy was developed, which possesses an ultra-high strength of 1441 MPa and a high electrical conductivity of 24.3 %IACS. This alloy outperforms the conventional C17200 alloy in overall properties, while the reduced consumption of strategic Be lowers raw material costs by approximately 13%. This work provides valuable theoretical and processing insights for the development of high-performance, low-beryllium copper alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"956 ","pages":"Article 149909"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146172773","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

Achieving large pre-deformation in a 7B52 laminated aluminum alloy with tailored layer thickness ratios via cryogenic rolling 通过低温轧制实现7B52层压铝合金具有定制层厚比的大预变形

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-02-03 DOI: 10.1016/j.msea.2026.149887

Yufei Chen , Peipei Ma , Longhui Chen , Wen Gao , Chunhui Liu

{"title":"Achieving large pre-deformation in a 7B52 laminated aluminum alloy with tailored layer thickness ratios via cryogenic rolling","authors":"Yufei Chen , Peipei Ma , Longhui Chen , Wen Gao , Chunhui Liu","doi":"10.1016/j.msea.2026.149887","DOIUrl":"10.1016/j.msea.2026.149887","url":null,"abstract":"<div><div>The multi-layer architecture of 7B52 laminated aluminum alloy is designed for superior properties, but its potential is limited by severe edge cracking and interfacial instability induced by conventional room-temperature rolling (RTR). This study introduces a cryogenic rolling (CTR) strategy to overcome these limitations. We systematically investigate laminates with tailored layer thickness ratios (7A52:7A62 = 1:2, 1:1, 2:1) through multi-scale characterizations and finite element analysis. Results demonstrate that RTR causes significant edge cracking and interfacial distortion, with the 2:1 ratio sample developing pronounced interface waviness due to extreme plastic mismatch. In contrast, CTR effectively suppresses these defects. Under cryogenic conditions, all laminates achieved uniform large-strain deformation (67% reduction) without macroscopic cracking, while simultaneously suppressing interlayer shear bands. The CTR-processed laminate with a 1:2 ratio retained high yield strength (581 MPa) and an elongation of 5.8%, outperforming its RTR counterpart which suffered from severe edge cracking at a similar strength (576 MPa). Microstructurally, CTR reduced the standard deviation of the kernel average misorientation (KAM) in the 7A62 layer by 33%, confirming more homogeneous storage of high-density dislocations. This is attributed to the suppression of dynamic recovery and the activation of multiple slip systems at cryogenic temperatures. FEA corroborated that CTR universally mitigates the plastic strain localization and high interlayer shear stress observed in RTR, with the shear stress being 30% higher at the 2:1 ratio than at the 1:2. These findings establish CTR as a fundamental processing route for overcoming performance limits in laminated alloys.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"955 ","pages":"Article 149887"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171527","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

Laves phase-induced failure and synergistic strength mechanism via in situ deformation for high-deposition-rate laser directed energy deposited Inconel 718 alloy 研究了高沉积速率激光定向能沉积Inconel 718合金的原位变形相致失效及协同强度机制

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-01-29 DOI: 10.1016/j.msea.2026.149816

Zuo Li , Xin Lin , Xin Hou , Bo Yao , Wei Fan , Chongliang Zhong , Hua Tan , Yiyi Zhou , Yi Min Xie

{"title":"Laves phase-induced failure and synergistic strength mechanism via in situ deformation for high-deposition-rate laser directed energy deposited Inconel 718 alloy","authors":"Zuo Li , Xin Lin , Xin Hou , Bo Yao , Wei Fan , Chongliang Zhong , Hua Tan , Yiyi Zhou , Yi Min Xie","doi":"10.1016/j.msea.2026.149816","DOIUrl":"10.1016/j.msea.2026.149816","url":null,"abstract":"<div><div>A strategic retention of the optimal content of granular Laves phase in laser directed energy deposited Inconel 718 alloy has been shown to improve strength and ductility, representing a novel paradigm for laser-based repair technologies in critical aerospace components. Fundamental issues persist with regard to the mechanism of Laves phase deformation, their role in crack initiation, and ultimate influence on mechanical performance. In this study, a high-deposition-rate laser directed energy deposition is employed that combines <em>in-situ</em> tensile testing to elucidate the deformation behavior of Laves phases with different characteristics. The material exhibits a high yield strength (1139.9–1173.8 MPa) and elongation (19.05–26.23 %) when retaining Laves phases with controlled dimensions (length: 2.20–3.50 μm, and width: 1.40–2.00 μm) and content (0.79–1.55 %). <em>In-situ</em> monitoring has revealed that a fragmentation of the Laves phase precedes interfacial separation. Two distinct strengthening mechanisms are identified: indirect strengthening <em>via</em> γ” phase modulation, and direct strengthening <em>via</em> morphology-dependent dislocation interactions. The granular Laves phase facilitates a more uniform dislocation distribution when compared with elongated variants, enabling improvements in strength.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"955 ","pages":"Article 149816"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171608","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

Achieving a superior synergy between strength and ductility of a novel metastable beta Ti alloy via tailoring deformation mechanisms 一种新型亚稳β钛合金通过剪裁变形机制实现了强度和延展性之间的卓越协同作用

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-01-28 DOI: 10.1016/j.msea.2026.149841

Rengen Ding , Yan Zhang , Qian Zhou , Xiongxiong Gao , Yulung Chiu , Jian Chen , Jian Miao

{"title":"Achieving a superior synergy between strength and ductility of a novel metastable beta Ti alloy via tailoring deformation mechanisms","authors":"Rengen Ding , Yan Zhang , Qian Zhou , Xiongxiong Gao , Yulung Chiu , Jian Chen , Jian Miao","doi":"10.1016/j.msea.2026.149841","DOIUrl":"10.1016/j.msea.2026.149841","url":null,"abstract":"<div><div>Metastable beta Ti alloys are one of the promising beta Ti alloys with excellent ductility. However, the metastable beta Ti alloys, especially those with transformation-induced plasticity (TRIP), commonly suffer from low yield strength. In this study, we adopted alloying of Fe and Nb to tune deformation mechanisms of a novel metastable beta Ti alloy (Ti-2Al-5Cr-5Mo) so as to achieve a superior synergy of strength and ductility. The alloys of Ti-2Al-5Cr-5Mo and Ti-2Al-5Cr-5Mo-1Nb are predominately deformed via stress-induced phase transformation, mechanical twinning and dislocation slip, showing excellent elongation (∼50 %) and moderate yield strength of ∼450 MPa. Adding 1.0 wt% Fe completely suppresses TRIP effect, thus reducing clearly elongation (∼19 %) but greatly enhancing the yield strength (∼820 MPa). However, the addition of 2.0 wt% Nb produces kink band to rejuvenate the elongation to 30.5 %. Therefore, Ti-2Al-5Cr-5Mo-1Fe-3Nb alloy possesses an excellent synergy of the yield strength (820 MPa) and ductility (30.5 %), which is superior to most other reported metastable beta Ti alloys. This study provides new paths for the development of superior strength and ductility of metastable beta Ti alloys in the future.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"955 ","pages":"Article 149841"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171678","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 influence of short-term annealing on the microstructure and residual stress to the mechanical properties of C18150 alloy strip 短期退火对C18150合金带材组织和残余应力的影响

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-01-25 DOI: 10.1016/j.msea.2026.149825

Yiying Miao , Jingzhao Yang , Yanjun Zhou , Yu Song , Tao Huang , Huiwen Guo , Kexing Song

{"title":"The influence of short-term annealing on the microstructure and residual stress to the mechanical properties of C18150 alloy strip","authors":"Yiying Miao , Jingzhao Yang , Yanjun Zhou , Yu Song , Tao Huang , Huiwen Guo , Kexing Song","doi":"10.1016/j.msea.2026.149825","DOIUrl":"10.1016/j.msea.2026.149825","url":null,"abstract":"<div><div>This work elucidates the microstructural and residual stress regulation mechanisms under 450 °C short-term annealing to mitigate warping in etched C18150 alloy lead frames. Optimal properties are achieved at 3 min of annealing, where nano-precipitate strengthening counterbalances dislocation-mediated softening. The alloy sustains 545 MPa strength alongside 85.39 % IACS conductivity and significant stress relief. Residual stress evolution demonstrates distinct anisotropy, fundamentally driven by the superposition of compressive stress relief via dislocation recovery and tensile stress introduction from nano-precipitate formation. Due to different initial rolling states, the extremely high initial compressive stress (−65 MPa) in the rolling direction (RD) quickly decreased to −16 MPa under dual effects, yet remained compressive. In contrast, the lower initial compressive stress (−33 MPa) in the transverse direction (TD) allowed the tensile stresses introduced by recovery and nano-precipitates to overcome the original stress, achieving an inversion from compressive to tensile stress. Moreover, extensive coarsening of large precipitates at 10 min (from 151 nm to 315 nm), alongside nano-precipitate growth, diminishes pinning efficiency and triggers material softening. This microstructural transition is governed by subgrain coalescence instead of recrystallization.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"955 ","pages":"Article 149825"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171624","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

High-temperature thermal behaviour of FeHf2 Laves phase heterostructures and carbon modification treatment FeHf2 Laves相异质结构的高温热行为及碳改性处理

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-02-06 DOI: 10.1016/j.msea.2026.149778

Xuecheng Peng , Hanjie Guo , Xinfang Zhang , Wensheng Yang , Yiwa Luo , Xiaochen Wang , Gang Li

{"title":"High-temperature thermal behaviour of FeHf2 Laves phase heterostructures and carbon modification treatment","authors":"Xuecheng Peng , Hanjie Guo , Xinfang Zhang , Wensheng Yang , Yiwa Luo , Xiaochen Wang , Gang Li","doi":"10.1016/j.msea.2026.149778","DOIUrl":"10.1016/j.msea.2026.149778","url":null,"abstract":"<div><div>Owing to its atomic size effect and strong negative enthalpy of mixing with other solute species, hafnium (Hf) has notable potential for incorporation into a range of cutting-edge materials, including high-entropy alloys and single-crystal nickel-based superalloys, especially nuclear-grade FeCrAl alloys. However, Hf atoms exhibit a strong tendency to form coarse and brittle intermetallic phases, such as FeHf<sub>2</sub>, which can result in abrupt degradation of the mechanical performance of the material. Traditional high-temperature heat treatment methods appear to be inadequate for fully dissolving FeHf<sub>2</sub> precipitates. In this work, the high-temperature thermal behaviour of FeHf<sub>2</sub> intermetallic compounds within FeCrAl alloys was systematically characterised using in situ scanning electron microscopy (SEM), transmission electron microscopy (TEM), and focused ion beam (FIB) techniques. The findings demonstrate that high-temperature heat treatment alone is insufficient to fully suppress precipitation of coarse FeHf<sub>2</sub> phases, primarily due to the existence of heterogeneous nucleation structures, wherein FeHf<sub>2</sub> tends to precipitate around HfC cores. A favourable lattice mismatch relationship exists between FeHf<sub>2</sub> and HfC, enabling the formation of FeHf<sub>2</sub>–HfC heterostructures that increase the precipitation temperature of FeHf<sub>2</sub>. Given the strong affinity between Hf and carbon atoms, carbon was deliberately introduced to bind free Hf atoms in the alloy matrix. A thermal treatment strategy involving high-temperature quenching followed by intermediate-temperature annealing was subsequently employed to refine coarse FeHf<sub>2</sub> particles and facilitate controlled precipitation of nanoscale HfC strengthening phases.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"955 ","pages":"Article 149778"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146171633","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 properties and strengthening mechanisms of eutectoid Al10(CoFeNi1.5)90 multi-component alloy 共晶Al10(CoFeNi1.5)90多组分合金的力学性能及强化机理

IF 7 2区材料科学

Materials Science and Engineering: A Pub Date : 2026-03-01 Epub Date: 2026-01-27 DOI: 10.1016/j.msea.2026.149850

Mazullah , Muhammad Ismail , Ke Zhang , Iqra Noreen , Hammad Ahmad , Elena Pereloma , Zhiping Xiong

{"title":"Mechanical properties and strengthening mechanisms of eutectoid Al10(CoFeNi1.5)90 multi-component alloy","authors":"Mazullah , Muhammad Ismail , Ke Zhang , Iqra Noreen , Hammad Ahmad , Elena Pereloma , Zhiping Xiong","doi":"10.1016/j.msea.2026.149850","DOIUrl":"10.1016/j.msea.2026.149850","url":null,"abstract":"<div><div>This work addresses the challenge of achieving eutectoid lamellar microstructures (LMs) in multi-component alloys (MCAs) by investigating the evolution of microstructures and mechanical properties in Al<sub>10</sub> (CoFeNi<sub>1.5</sub>)<sub>90</sub> MCA. The results demonstrate that the FCC phase transforms into LMs when aged between 400 and 600 °C. The mechanical properties depend strongly on the lamellar FCC phase width in the LMs, which, in turn, depends on the aging temperature. Aging at 600 °C yields wide LMs (242 ± 150 nm) with lower strength (YS = 758 ± 18 MPa, UTS = 1219 ± 15 MPa) but higher ductility (UE = 17 ± 3 %), while aging at 450 °C yields thin LMs (45 ± 18 nm) with ultra-high strength (YS = 2091 ± 22 MPa, UTS = 2149 ± 16 MPa) but limited ductility (UE = 1.3 ± 0.2 %). The calculated yield strength of 1180 MPa, obtained from the linear summation method of grain boundaries (<span><math><mrow><msub><mi>σ</mi><mrow><mi>G</mi><mi>B</mi></mrow></msub></mrow></math></span>, 33 %), solid solution (<span><math><mrow><msub><mi>σ</mi><mrow><mi>s</mi><mi>s</mi></mrow></msub></mrow></math></span>, ⁓27 %), dislocations (<span><math><mrow><msub><mi>σ</mi><mi>D</mi></msub></mrow></math></span>, ⁓25 %), and precipitations (<span><math><mrow><msub><mi>σ</mi><mi>P</mi></msub></mrow></math></span>, ⁓15 %) contributions, shows excellent agreement with the experimental value of 1167 MPa.</div></div>","PeriodicalId":385,"journal":{"name":"Materials Science and Engineering: A","volume":"955 ","pages":"Article 149850"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077033","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}

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