部分再结晶的0000组织增强了单相Co35.5Ni35.5Cr10Fe10Mo9多主元素合金的强度-塑性协同作用

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-04-23 DOI:10.1016/j.msea.2025.148398

Kerui Yu , Honghong Su , Yixi Hou , Guoliang Pei , Qiyu Wang , Cheng Jiang , Luyan Yang , Dawei Pang , Xiao Wei , Shengcheng Mao , Xiaodong Han

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引用次数: 0

摘要

CoCrFeNi多主元素合金（MPEA）以其优异的延展性而闻名；然而，其较低的室温强度限制了其广泛的实际应用。本研究制备了部分再结晶的异质组织单相Co35.5Ni35.5Cr10Fe10Mo9合金。这种合金是通过掺杂钼（Mo）来设计的，钼是一种具有更大原子半径的元素，结合异质结构策略。该合金在室温下具有较高的屈服强度（1131 MPa）和良好的塑性（23.6%），表现出强度和塑性的平衡增强。这种合金的这种特殊性能归因于几种机制的协同作用，包括层错网络、lomo - cottrell位错锁、变形孪晶诱导塑性和非均质变形诱导硬化。这些机制共同作用，增强拉伸变形过程中的应变硬化。这项研究强调了利用部分再结晶异质结构作为优化mpea力学性能的手段的潜力。

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Partially recrystallized 0000 microstructure enhanced strength-ductility synergy in a single phase Co35.5Ni35.5Cr10Fe10Mo9 multi-principal element alloy

The CoCrFeNi multi-principal element alloy (MPEA) is well known for its remarkable ductility; however, its low room-temperature strength limits its broader practical applications. In this study, a partially recrystallized heterostructure single-phase Co_35.5Ni_35.5Cr₁₀Fe₁₀Mo₉ alloy was developed. This alloy was engineered through the doping of molybdenum (Mo), an element with a larger atomic radius, in combination with a heterostructure strategy. The alloy exhibits both high yield strength (1131 MPa) and excellent ductility (23.6 %) at room temperature, showcasing a balanced enhancement of strength and ductility. Such exceptional properties of this alloy are attributed to the synergistic effects of several mechanisms, including stacking fault networks, Lomer-Cottrell dislocation locks, deformation twinning-induced plasticity, and heterogeneous deformation-induced hardening. These mechanisms work together to enhance strain-hardening during tensile deformation. This study highlights the potential of utilizing partially recrystallized heterostructures as means to optimize the mechanical properties of MPEAs.

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.