Dynamic compression behavior and strengthening mechanisms of Nb-alloyed CoCrNi medium entropy alloys

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-09-27 DOI:10.1016/j.msea.2025.149198

Yihuan Cao , Yuxian Cao , Yunwei Gui , Zihan Jia , Yingying Li , Qingsheng Liu , Huadong Fu

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引用次数: 0

Abstract

It is of substantial scientific significance and practical value to understand the mechanical properties and intrinsic mechanisms of medium-entropy alloys (MEAs) under high strain rates. This study systematically investigates Nb microalloying effects on the dynamic deformation behavior of CoCrNi MEAs, revealing Nb-dependent microstructural evolution and strengthening mechanisms. Nb addition induces multi-scale second phase formation accompanied by lattice expansion/distortion, effectively suppressing grain boundary mobility and dislocation annihilation during recrystallization. These coupled microstructural modifications lead to a significant enhancement in yield strength under high-strain-rate loading compared to Nb-free counterparts. Furthermore, the hierarchical strain accommodation mechanisms, encompassing dislocations, stacking faults, and deformation nanotwins, synergistically contribute to superior strain hardening. The research findings provide key theoretical and experimental support for the application of medium-entropy alloys under extreme dynamic loads.

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铌化CoCrNi中熵合金的动态压缩行为及强化机理

研究中熵合金在高应变速率下的力学性能及其内在机制具有重要的科学意义和实用价值。本研究系统研究了Nb微合金化对CoCrNi MEAs动态变形行为的影响，揭示了Nb依赖的微观组织演化和强化机制。Nb的加入诱导了多尺度第二相的形成，并伴随着晶格膨胀/变形，有效地抑制了再结晶过程中的晶界迁移率和位错湮灭。与无铌合金相比，这些耦合的微观结构修饰导致高应变率载荷下屈服强度的显著提高。此外，分层应变调节机制，包括位错、层错和变形纳米孪晶，协同促进了优异的应变硬化。研究结果为中熵合金在极端动载荷下的应用提供了关键的理论和实验支持。

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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.