Extraordinary strength-ductility synergy in chemically complex intermetallic alloys with hierarchical dual-phase nanostructures

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-04-26 DOI:10.1016/j.actamat.2025.121084

W.C. Xiao , W.W. Xu , J.X. Zhang , J.Y. Zhang , S.F. Liu , B. Xiao , Y.H. Zhou , J. Ju , Q. Li , Y.L. Zhao , X.L. Wang , P.K. Liaw , T. Yang

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Abstract

Developing structural materials with an excellent combination of strength and ductility is a parament task in advanced industries. Conventional intermetallic alloys (IMAs) usually suffer from insufficient ductility, which severely restricts their practical applications. In this study, we developed a novel high-performance bulk chemically complex intermetallic alloys (CCIMAs) in the multicomponent (Ni, Co)₃(Si, Ti, Al) system. The microstructure, mechanical properties, and associated deformation behaviors were systematically investigated through combinational analyses such as three-dimensional atom probe tomography (3D-APT) and transmission electron microscope (TEM). By multi-step cold rolling and annealing path, the newly developed (Ni, Co)₃(Si, Ti, Al)-type alloys show a unique hierarchical dual-phase nanostructure, exhibiting extraordinary strength and ductility at ambient temperature. The yield strength, tensile strength, and ductility can reach ∼1011 MPa, ∼1690 MPa, and 35 %, respectively. Detailed TEM and 3D-APT analyses revealed that the coherent Co-rich disordered nanoparticles precipitated out from the L1₂ matrix region. These reversely precipitated nanoparticles are mainly sheared by superlattice dislocation pairs and generate a significant strengthening effect. Superlattice stacking faults (SSFs) were also observed at large deformation due to the reduction of stacking fault energy and high stress level that reaches a critical value. These findings are expected to accelerate the innovative design of ultra-strong yet ductile intermetallic compounds for structural applications.

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具有分层双相纳米结构的化学复杂金属间合金的非凡强度-延展性协同作用

开发强度和延性兼备的结构材料是先进工业的重要课题。传统金属间合金的延展性不足，严重制约了其实际应用。在这项研究中，我们在多组分（Ni, Co）3（Si, Ti, Al）体系中开发了一种新型的高性能体化学复杂金属间合金（ccima）。通过三维原子探针断层扫描（3D-APT）和透射电子显微镜（TEM）等组合分析，系统地研究了复合材料的显微组织、力学性能和相关变形行为。通过多步冷轧和退火工艺，制备的（Ni, Co）3（Si, Ti, Al）型合金呈现出独特的分层双相纳米结构，在常温下表现出优异的强度和延展性。屈服强度、抗拉强度和延展性分别可达~ 1011 MPa、~ 1690 MPa和35%。详细的TEM和3D-APT分析表明，从L12基体区域析出了相干的富co无序纳米颗粒。这些反向沉淀的纳米颗粒主要被超晶格位错对剪切，并产生显著的强化效应。由于层错能的降低和达到临界值的高应力水平，在大变形时也观察到超晶格层错。这些发现有望加速用于结构应用的超强延展性金属间化合物的创新设计。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.