Grain refinement and precipitation synergistic strengthening in CuMnNiTix medium-entropy alloys

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2025-02-01 DOI:10.1016/j.msea.2024.147659

Jie Cheng , Yujie Ma , Xiaotian Wang , Liang Cheng , Yaoyao Hu , Tairan Xu , Zhenhua Cao

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Abstract

In this study, Cu₄₀Mn₃₀Ni₃₀ (Ti0) and Cu₃₈Mn_28.5Ni_28.5Ti₅ (Ti5) medium-entropy alloys (MEAs) were designed, and the influence of 5 at.% Ti addition on the microstructure and mechanical properties of the MEAs was investigated. The results indicated that the addition of Ti promoted the formation of Ni₃Ti-rich hexagonal close-packed (hcp) precipitates, leading to significant grain refinement in the Ti5 MEA. The yield strength, tensile strength and elongation of Ti5-A750 MEA achieved 586 ± 17 MPa, 893 ± 18 MPa and 7.7 ± 0.4 %, respectively, showing a superior combination of high strength and ductility compared to the Ti0-A750 MEA and other traditional high-strength Cu alloys. The improvement of mechanical properties for Ti5-A750 MEA was mainly attributed to the synergistic strengthening mechanisms of grain refinement strengthening and precipitation strengthening resulting from the Ni₃Ti-rich hcp precipitates. This synergistic strengthening strategy provides new ideas for designing novel high strength and ductility Cu alloys.

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CuMnNiTix中熵合金的晶粒细化和析出协同强化

本研究设计了Cu40Mn30Ni30 （Ti0）和Cu38Mn28.5Ni28.5Ti5 （Ti5）中熵合金（MEAs），研究了5 at的影响。研究了添加% Ti对MEAs显微组织和力学性能的影响。结果表明，Ti的加入促进了富ni3ti六方密堆积（hcp）相的形成，导致Ti5 MEA中晶粒明显细化。Ti5-A750 MEA的屈服强度、抗拉强度和伸长率分别达到586±17 MPa、893±18 MPa和7.7±0.4%，与Ti0-A750 MEA和其他传统高强度Cu合金相比，具有优越的高强度和延展性。Ti5-A750 MEA力学性能的改善主要是由于富ni3ti的hcp析出相产生的晶粒细化强化和析出强化的协同强化机制所致。这种协同强化策略为设计新型高强度、高延展性铜合金提供了新的思路。

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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.