Effects of Ti on the Ageing Microstructure and Mechanical Properties of Ni-Co-Cr-Ti Multi-Principal Element Alloy

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

Materials Science and Engineering: A Pub Date : 2025-02-06 DOI:10.1016/j.msea.2025.148007

Yuxin Sun , Caixia Wang , Caijuan Shi , Ruixin Sheng , Weidong Li , Gihan Velisa , Shuying Chen , Fanchao Meng , Peter K. Liaw , Y. Tong

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引用次数: 0

Abstract

We investigated the impact of Ti addition on the microstructure, tensile properties, and deformation mechanisms of the Co₅₀Cr₃₀Ni₂₀ multi-principal element alloy. Our findings show that different heat treatments yield varied microstructures, including combinations of incoherent precipitates at grain boundaries with coherent precipitates within grains, mixtures of lamellae in discontinuous precipitation zones and coherent precipitates in continuous zones, and configurations of a Widmanstätten microstructure with cuboidal precipitates. Among all aged specimens, the strongest alloy exhibits a yield strength of 1193 MPa, ultimate tensile strength of 1535 MPa, and notable elongation of 17%. Detailed microstructural characterization reveals that Ti addition effectively suppresses the formation of the brittle hexagonal close-packed phase, while the uniform distribution of nanoscale L1₂ phase particles within grains contributes to grain refinement and dislocation pinning, enhancing alloy strength. Furthermore, the development of stacking fault networks introduces an additional strengthening mechanism via the dynamic Hall-Petch effect. Together, these mechanisms are essential for improving strain-hardening capacity and ultimately enhancing the alloy’s ductility.

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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.