Materials Characterization最新文献_第2页

Microstructure evolution and precipitate phase growth mechanism of hypereutectoid Al-37Fe-2Er alloy 过共析Al-37Fe-2Er合金组织演变及析出相生长机制

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-16 DOI: 10.1016/j.matchar.2026.116159

Yifan Zhang , Haiyang Hu , Zhongliang Song , Shan Zhang , Wenhui Wu , Wenhui Zhang , Jinshuai Zhang

{"title":"Microstructure evolution and precipitate phase growth mechanism of hypereutectoid Al-37Fe-2Er alloy","authors":"Yifan Zhang , Haiyang Hu , Zhongliang Song , Shan Zhang , Wenhui Wu , Wenhui Zhang , Jinshuai Zhang","doi":"10.1016/j.matchar.2026.116159","DOIUrl":"10.1016/j.matchar.2026.116159","url":null,"abstract":"<div><div>Rare earth elements are widely used in Al alloy materials due to their ability to optimize the microstructure. The microstructure evolution of the Al-37Fe-2Er alloy and the growth mechanism of the Al<sub>8</sub>Fe<sub>4</sub>Er precipitate phase were studied via synchrotron X-ray microtomography, confocal laser scanning microscopy and density functional theory calculation. The results show that the microstructure of the Al-37Fe-Er alloy consists of the Al<sub>8</sub>Fe<sub>4</sub>Er phase, proeutectoid FeAl<sub>2</sub> phase, and the eutectoid structure of FeAl+FeAl<sub>2</sub>. The Al<sub>8</sub>Fe<sub>4</sub>Er phase is formed through three pathways: direct precipitation from the liquid phase, formation from the Fe<sub>5</sub>Al<sub>8</sub> phase via massive transformation, and solid-state phase transformation at the front of the eutectoid structure. The Al<sub>8</sub>Fe<sub>4</sub>Er phase grows along the 〈101〉 direction and the coupling of lattice distortion and elastic strain energy significantly reduce the phase transition potential barrier. The Al<sub>8</sub>Fe<sub>4</sub>Er phase mainly undergoes massive transformation dominated by short-range diffusion and lattice shear, and has no orientation relationship with the parent phase Fe<sub>5</sub>Al<sub>8</sub>.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116159"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386464","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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Mesoscale quantification of Mg2Si precipitation heterogeneity in Al6061 using low-interaction-volume atomic-ratio EDS mapping 利用低相互作用体积原子比能谱图量化Al6061中Mg2Si析出非均匀性的中尺度研究

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-18 DOI: 10.1016/j.matchar.2026.116162

Hyeunseok Cheun, Young Choi, Seungkyu Moon, Choul Kim, Jaesung Hwang, Young Hwan Min, Hui-Youn Shin

{"title":"Mesoscale quantification of Mg2Si precipitation heterogeneity in Al6061 using low-interaction-volume atomic-ratio EDS mapping","authors":"Hyeunseok Cheun, Young Choi, Seungkyu Moon, Choul Kim, Jaesung Hwang, Young Hwan Min, Hui-Youn Shin","doi":"10.1016/j.matchar.2026.116162","DOIUrl":"10.1016/j.matchar.2026.116162","url":null,"abstract":"<div><div>Quantifying the spatial heterogeneity of Mg<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>Si precipitates in Al6061 alloys is critical for optimizing mechanical reliability but remains challenging due to the scale gap between XRD and TEM. This study presents a quantitative SEM-EDS mapping protocol optimized for mesoscale characterization. By employing a low accelerating voltage (10 kV) to restrict electron interaction volume and applying pixel-wise atomic ratio analysis (<span><math><mrow><msub><mrow><mi>C</mi></mrow><mrow><mi>Mg</mi></mrow></msub><mo>/</mo><msub><mrow><mi>C</mi></mrow><mrow><mi>Si</mi></mrow></msub></mrow></math></span>), we effectively segmented precipitate-enriched regions. Despite matrix absorption effects, a strict stoichiometric threshold (<span><math><mrow><mn>2</mn><mo>.</mo><mn>00</mn><mo>±</mo><mn>0</mn><mo>.</mo><mn>05</mn></mrow></math></span>) allowed for the isolation of high-confidence precipitate cores. The method revealed a <span><math><mo>∼</mo></math></span>13.5-fold increase in precipitate cluster area after T6 aging, capturing spatial densification more sensitively than the 2.7-fold volume increase measured by bulk XRD. Furthermore, integrating these maps with EBSD strain analysis demonstrated that these clusters form a network architecture spatially correlated with high-strain grain boundaries. This methodology offers a rapid and statistically representative analysis for monitoring precipitation inhomogeneity, effectively filling the analytical gap between bulk diffraction and nanoscale imaging.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116162"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386501","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

Laser powder bed fusion of SAF 3207 hyper duplex stainless steel featuring columnar-to-equiaxed transition SAF 3207超双相不锈钢的激光粉末床熔合，具有柱状到等轴转变

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-23 DOI: 10.1016/j.matchar.2026.116190

Jalal Kangazian , Soung Yeoul Ahn , Bon Woo Koo , Jae Heung Lee , Shi Woo Lee , Muhammad Raihan Hashmi , Hyoung Seop Kim

{"title":"Laser powder bed fusion of SAF 3207 hyper duplex stainless steel featuring columnar-to-equiaxed transition","authors":"Jalal Kangazian , Soung Yeoul Ahn , Bon Woo Koo , Jae Heung Lee , Shi Woo Lee , Muhammad Raihan Hashmi , Hyoung Seop Kim","doi":"10.1016/j.matchar.2026.116190","DOIUrl":"10.1016/j.matchar.2026.116190","url":null,"abstract":"<div><div>This study reports the successful fabrication of SAF 3207 hyper duplex stainless steel (HDSS) via laser powder bed fusion (LPBF), a high-performance alloy with an exceptional pitting resistance equivalent number (PREN = 51.5). By optimizing process parameters at layer thicknesses of 30 μm and 50 μm, a processing window and near-full densification (≥99.9%) were achieved, accompanied by a dual-phase microstructure containing 8–20% austenite phase. The solidification path of SAF 3207 is governed by its high growth restriction factor and pronounced constitutional undercooling, which promote the columnar-to-equiaxed (CET) transition and enhance austenite stability. Compared to conventional DSS (duplex stainless steel) grades such as SAF 2205 and SAF 2507, Thermo-Calc simulations support a more pronounced ferritic–austenitic solidification tendency for SAF 3207 under the same assumptions. The resulting microstructure exhibits a yield strength exceeding 1280 MPa and uniform elongation up to 7%. Notably, even under high-productivity LPBF conditions with layer thicknesses up to 50 μm, mechanical performance remains robust despite minor porosity. Overall, this work presents SAF 3207 HDSS as a promising option for additive manufacturing of structural components, owing to its distinctive CET transition microstructure, which is clearly distinguishable from those typically reported for LPBF-fabricated DSS grades. Notably, few studies have systematically examined how layer thickness influences productivity, microstructural characteristics, and tensile properties in LPBF-produced DSSs.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116190"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386537","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

Synergistic interfacial design and dual-phase precipitation for high-strength, high-thermal-conductivity Mg-Zn-Al/MWCNT composites 高强度、高导热Mg-Zn-Al/MWCNT复合材料的协同界面设计和双相沉淀

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-26 DOI: 10.1016/j.matchar.2026.116201

Jiangtao Hou , Wenbo Du , Siqing Feng , Xin Xu , Cheng Liu , Yiming Li , Langxiang Zhong , Yujia Xu , Yunhao Kang

{"title":"Synergistic interfacial design and dual-phase precipitation for high-strength, high-thermal-conductivity Mg-Zn-Al/MWCNT composites","authors":"Jiangtao Hou , Wenbo Du , Siqing Feng , Xin Xu , Cheng Liu , Yiming Li , Langxiang Zhong , Yujia Xu , Yunhao Kang","doi":"10.1016/j.matchar.2026.116201","DOIUrl":"10.1016/j.matchar.2026.116201","url":null,"abstract":"<div><div>In the present work, Mg-Zn-Al matrix composites reinforced with multi-walled carbon nanotubes (MWCNTs) were synthesized using a powder metallurgy route coupled with an aging treatment. The influence of Al content and MWCNT addition on the microstructure, mechanical properties, and thermal conductivity of the composites was examined. It was found that the MWCNTs were uniformly dispersed within the matrix, and a partially inserted (PI) interface formed between them and the Mg matrix. After aging treatment, the precipitated phases in the composites consisted of <span><math><msubsup><mi>β</mi><mn>1</mn><mo>′</mo></msubsup></math></span> phase and icosahedral quasi-crystal phase (I phase), and the dominant precipitate shifted from <span><math><msubsup><mi>β</mi><mn>1</mn><mo>′</mo></msubsup></math></span> to I phase as Al content exceeded 1.5 wt%. The evaluation of mechanical properties revealed that the aged Mg-6Zn-1.5Al/0.4MWCNTs composite exhibited tensile yield and ultimate tensile strengths of 296 MPa and 371 MPa, respectively, exhibiting 39% and 25% enhancements compared to the Mg<img>6Zn alloy. Meanwhile, the composite maintained a high thermal conductivity of 101.4 W/(m·K). The enhanced mechanical strength was primarily attributed to the efficient load transfer enabled by well-dispersed MWCNTs with strong interfacial bonding, and was further supplemented by the synergistic strengthening from dual precipitates, Al-induced texture strengthening and minor grain refinement. The high thermal conductivity of the composite was due to the acceleration effect of MWCNTs on free electron migration, coupled with the alleviation of lattice distortions in the Mg matrix caused by the precipitation of <span><math><msubsup><mi>β</mi><mn>1</mn><mo>′</mo></msubsup></math></span> phase and I phase.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116201"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386567","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 mechanism of vanadium microalloying to enhance the mechanical properties and damping capacity in high manganese steel 揭示了钒微合金化提高高锰钢力学性能和阻尼性能的机理

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-03-09 DOI: 10.1016/j.matchar.2026.116239

Shuai Wang , Xiaoli Zhang , Yang Zhao , Junjun Cui , Liqing Chen

{"title":"Unraveling the mechanism of vanadium microalloying to enhance the mechanical properties and damping capacity in high manganese steel","authors":"Shuai Wang , Xiaoli Zhang , Yang Zhao , Junjun Cui , Liqing Chen","doi":"10.1016/j.matchar.2026.116239","DOIUrl":"10.1016/j.matchar.2026.116239","url":null,"abstract":"<div><div>High‑manganese (Mn) steel with an appropriate Mn content exhibits an exceptional damping capacity, which makes it an important and promising structurally and functionally integrated material. In fact, the interstitial carbon atoms in high-Mn damping steel not only inhibit ε-martensitic transformation and formation of stacking faults, which can affect the mechanical properties, but also impede the movement of partial dislocations, thereby deteriorating the damping capacity. In this study, we propose the strategy of using vanadium (V)-microalloying to deplete carbon atoms, attempting to reduce the adverse effects of carbon atoms. The results show that after V-microalloying in Fe-17Mn-V steel, both the mechanical properties and damping capacity have been improved. The strength increase primarily comes from coordinate grain refinement, carbide precipitation, and controlled martensitic transformations; in addition, the enhancement of damping capacity is closely related to the precipitation of V-rich carbides. The V-rich carbides reduce the weak pinning points (C and Cr atoms), thereby lowering the resistance of partial dislocations during the bowing out and breakaway movements. At high strain amplitude, the planar slips of partial and full dislocations are the primary damping mechanisms, and the damping capacity increases rapidly. Moreover, the planar slips of partial and full dislocations can bypass the V-rich carbides, dissipating more energy and further improving the damping capacity. The V-microalloying high-Mn damping steels exhibit an outstanding combination of mechanical properties (tensile strength >950 MPa, elongation >43.0%) and damping capacity (0.041, strain amplitude of 0.1%, frequency of 1 Hz).</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116239"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386690","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

Surface modification of β-type Ti–13Nb–7Sn–4Mo alloy by Sr and Ag incorporation into CaTiO3/anatase nanotubes for antibacterial and cell proliferation enhancement 在CaTiO3/锐钛矿纳米管中掺入Sr和Ag对β型Ti-13Nb-7Sn-4Mo合金表面进行抗菌和细胞增殖修饰

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-03-06 DOI: 10.1016/j.matchar.2026.116234

Hsueh-Chuan Hsu , Shih-Ching Wu , Xin-Hao Chou , Wen-Fu Ho

{"title":"Surface modification of β-type Ti–13Nb–7Sn–4Mo alloy by Sr and Ag incorporation into CaTiO3/anatase nanotubes for antibacterial and cell proliferation enhancement","authors":"Hsueh-Chuan Hsu , Shih-Ching Wu , Xin-Hao Chou , Wen-Fu Ho","doi":"10.1016/j.matchar.2026.116234","DOIUrl":"10.1016/j.matchar.2026.116234","url":null,"abstract":"<div><div>To address the persistent challenges of implant-associated infections and insufficient osseointegration, this study presents a surface modification strategy for low-modulus Ti–13Nb–7Sn–4Mo alloy. In this approach, titania nanotube arrays were prepared by anodization and microwave annealing. A CaTiO<sub>3</sub>/anatase hybrid structure was then formed hydrothermally, followed by Sr and Ag incorporation to enhance cell response and antibacterial function. Transmission electron microscopy analysis revealed that CaTiO<sub>3</sub> particles were primarily distributed on the nanotube surface and partially extended into the nanotube interiors. Selected area electron diffraction and high-resolution TEM confirmed the formation of Ca<sub>(1–x)</sub>Sr<sub>x</sub>TiO<sub>3</sub>, indicating partial substitution of Ca by Sr. In addition, Ag nanoparticles with uniform distribution on and within the nanotube arrays were identified by TEM-SAED analysis. Antibacterial assays using <em>Staphylococcus aureus</em> and <em>Escherichia coli</em> demonstrated that the sample with 0.58 at.% Ag achieved an antibacterial activity value (R) greater than 2.0, corresponding to a bacterial reduction rate exceeding 99%, indicating effective antibacterial performance. These findings highlight the critical role of surface Ag content in antibacterial efficacy. Furthermore, in vitro culture of MG63 osteoblastic cells confirmed that the hierarchical surface morphology—including micron, submicron, and nanoscale features—facilitated strong cell adhesion and proliferation.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116234"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386747","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

Formation and evolution mechanism of twin substructures in Tb-Dy-Fe alloys during Bridgman directional solidification processes Tb-Dy-Fe合金Bridgman定向凝固过程中孪晶亚结构的形成与演化机制

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-03-04 DOI: 10.1016/j.matchar.2026.116220

Jiangping Xin , Siyuan Zhang , Jiheng Li , Xiaoqian Bao , Xuexu Gao

{"title":"Formation and evolution mechanism of twin substructures in Tb-Dy-Fe alloys during Bridgman directional solidification processes","authors":"Jiangping Xin , Siyuan Zhang , Jiheng Li , Xiaoqian Bao , Xuexu Gao","doi":"10.1016/j.matchar.2026.116220","DOIUrl":"10.1016/j.matchar.2026.116220","url":null,"abstract":"<div><div>Tb<sub>0.27</sub>Dy<sub>0.73</sub>Fe<sub>1.95</sub> rare earth magnetostrictive rods with a dimension of φ32 × 200 mm were prepared by the Bridgman directional solidification method. Analyses using techniques such as EBSD and TEM confirmed the existence of twin substructures within Laves (ReFe<sub>2</sub>) phase crystals during the growth process of oriented grains. Through the synergistic analysis of orientation distribution, atomic arrangement, and local strain, the formation mechanism of twin substructures and their evolution with the growth of oriented grains were systematically investigated. The experimental results show that the formation of twin substructures originates from atomic stacking faults in the {111} close-packed planes and is regulated by increased undercooling induced by the grain growth environment, as well as local stress and compositional fluctuations. During the initial growth stage, solute enrichment on both sides of grains induces the formation of twin bands composed of twin lamellae in the transverse direction. The twin boundaries are Σ3{111} coherent twin boundaries (CTB), which are flat and parallel to the longitudinal growth direction. And the width and number of these twin lamellae increase synchronously with grain growth. In the later stage of grain growth, the decreased temperature gradient at the solid-liquid interface front intensifies solute enrichment, promoting the formation of twins along the longitudinal direction (i.e., the temperature gradient direction). The twin boundaries exhibit a step-like morphology and consist of Σ3{111} CTBs and Σ3{112} incoherent twin boundaries (ITBs), which completely alter the longitudinal growth orientation of the grains. This study clarifies the evolution patterns of twins and their key influencing factors during the directional solidification process, deepens the understanding of the orientation growth mechanism of Tb-Dy-Fe alloys.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116220"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386749","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

Dual-heterostructure in selective laser melted CuCrZr alloy: Formation mechanism, deformation behavior and mechanical response 选择性激光熔化CuCrZr合金的双异质结构：形成机制、变形行为和力学响应

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-27 DOI: 10.1016/j.matchar.2026.116205

Yihao Luo , Shuqin Zhang , Liuyi Huang , Yingquan Liu , Ziye Xue , Yiming Chen , Jiabin Liu

{"title":"Dual-heterostructure in selective laser melted CuCrZr alloy: Formation mechanism, deformation behavior and mechanical response","authors":"Yihao Luo , Shuqin Zhang , Liuyi Huang , Yingquan Liu , Ziye Xue , Yiming Chen , Jiabin Liu","doi":"10.1016/j.matchar.2026.116205","DOIUrl":"10.1016/j.matchar.2026.116205","url":null,"abstract":"<div><div>CuCrZr alloy is considered a promising candidate for combustion chamber liners by virtue of its excellent strength and conductivity. In this study, a CuCrZr alloy fabricated by selective laser melting (SLM) and subsequently peak-aged at 500 °C for 0.5 h achieves an excellent strength-conductivity synergy. This enhancement is attributed to the synergistic effect of a heterogeneous grain structure and dual-scale precipitates. The results indicate that the as-built CuCrZr alloy exhibits a bimodal grain structure, consisting of coarse columnar grains in the melt pool centers and fine equiaxed grains in the boundary overlap regions. Simultaneously, intrinsic heat treatment during SLM leads to the formation of primary coarse Cr precipitates with incoherent phase interface. Subsequent aging promotes the precipitation of fine, coherent secondary Cr precipitates. During deformation, plastic incompatibility, arising from the preferential yielding of coarse columnar grains constrained by elastic fine equiaxed grains, creates strain gradients and geometrically necessary dislocations accumulation. The increasing low-angle grain boundaries fraction with strain helps coordinate this deformation, while the ensuing strain partitioning maintains a strain gradient that thereby drives continuous work hardening to fracture. The precipitates govern strengthening via shearing/Orowan mechanisms. The consequent microstructural evolution, from dislocation forests to final damage initiation, underpins the robust mechanical response. This integrated design yields a substantial improvement in both ultimate tensile strength (to 652.8 MPa) and electrical conductivity (to 62.3% IACS) for as-built CuCrZr alloy.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116205"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386757","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

Simultaneous improvement of strength and ductility of Al-2.9Cu-0.8Li alloy: Through addition of Sc and Ti and low-temperature pre-aging treatment 同时提高Al-2.9Cu-0.8Li合金的强度和塑性：通过添加Sc和Ti和低温预时效处理

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-16 DOI: 10.1016/j.matchar.2026.116165

Wei Zhou , Zhen-zhen Liu , Wen-bin Sun , Hao Cheng , Bang-guo Wu , Tian-le Liu , Dan-yang Liu , Jin-feng Li

{"title":"Simultaneous improvement of strength and ductility of Al-2.9Cu-0.8Li alloy: Through addition of Sc and Ti and low-temperature pre-aging treatment","authors":"Wei Zhou , Zhen-zhen Liu , Wen-bin Sun , Hao Cheng , Bang-guo Wu , Tian-le Liu , Dan-yang Liu , Jin-feng Li","doi":"10.1016/j.matchar.2026.116165","DOIUrl":"10.1016/j.matchar.2026.116165","url":null,"abstract":"<div><div>The influence of trace Sc and Ti additions on the microstructure evolution and mechanical properties of Al-2.9Cu-0.8Li alloy was investigated. Furthermore, the mechanical performance was enhanced through the introduction of a low-temperature pre-aging treatment. The results indicated that the combined addition of Sc and Ti combined with low-temperature pre-aging treatment ultimately yields an excellent combination of mechanical properties, including an ultimate tensile strength (UTS) of 449.7 MPa, yield strength (YS) of 368.1 MPa, and elongation (EL) of 14.6%. The Sc and Ti elements were found to preferentially co-precipitate with Zr during solidification, forming Al<sub>3</sub>(Sc, Zr, Ti) particles that act as nucleation sites to refine the alloy's grain structure. During recrystallization, these particles inhibit grain boundary migration, thereby contributing to enhanced grain refinement. During the artificial aging process, the Al<sub>3</sub>(Sc, Zr, Ti) particles acted as nucleation sites to promote the precipitation of T<sub>1</sub> and S phases, while reducing the width of precipitate-free zones (PFZs) at grain boundaries (GBs). Additionally, Sc and Ti solute atoms were verified to exhibit strong interactions with clusters such as Va, Cu-Va, and Mg-Va, significantly accelerating the precipitation of the S phase while suppressing the formation of the θ’ phase. Furthermore, a low-temperature pre-aging treatment creates favorable nucleation conditions for the T<sub>1</sub> phase, increasing its number density and promoting a more uniform distribution. These factors collectively contribute to the improved strength and ductility of the studied Al-Cu-Li alloy.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116165"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386463","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

Strain rate and temperature dependent dynamic response of CoCrFeNi high-entropy alloy fabricated by laser powder bed fusion 激光粉末床熔合CoCrFeNi高熵合金应变速率和温度相关的动态响应

IF 5.5 2区材料科学

Materials Characterization Pub Date : 2026-04-01 Epub Date: 2026-02-19 DOI: 10.1016/j.matchar.2026.116181

Zhiyuan Chen , Hongyu Chen , Ke Chen , Yang Liu , Yonggang Wang , Konrad Kosiba , Konda Gokuldoss Prashanth

{"title":"Strain rate and temperature dependent dynamic response of CoCrFeNi high-entropy alloy fabricated by laser powder bed fusion","authors":"Zhiyuan Chen , Hongyu Chen , Ke Chen , Yang Liu , Yonggang Wang , Konrad Kosiba , Konda Gokuldoss Prashanth","doi":"10.1016/j.matchar.2026.116181","DOIUrl":"10.1016/j.matchar.2026.116181","url":null,"abstract":"<div><div>Laser powder bed fusion (LPBF) offers an effective route for producing high-entropy alloys (HEAs) with tailored microstructures and properties. In this study, experimental testing combined with molecular dynamics (MD) simulations was used to investigate the dynamic deformation behavior of LPBF-fabricated CoCrFeNi HEAs under different strain rates and temperatures. The alloy exhibits pronounced strain-rate dependence, with the dominant deformation mechanism shifting from dislocation slip at low strain rates to deformation twinning at high strain rates. Nanoscale twin boundaries act as strong obstacles to dislocation motion, contributing to the enhanced impact resistance of the alloy. Temperature also plays a crucial role in governing the dynamic response. At cryogenic temperatures, the HEA shows significantly improved strain-hardening capability, which is attributed to the hierarchical formation of nanotwins and their interactions with partial dislocations. Extended stacking faults at low temperatures promote dislocation dissociation and restrict cross-slip, intensifying the interactions between dislocations and hierarchical nanotwins and facilitating stress redistribution. This study clarifies the dynamic deformation mechanisms of LPBF-produced CoCrFeNi HEAs and provides insights for designing high-performance materials for extreme service environments.</div></div>","PeriodicalId":18727,"journal":{"name":"Materials Characterization","volume":"234 ","pages":"Article 116181"},"PeriodicalIF":5.5,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386500","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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