Enhancing Strength-Ductility Synergy of CoCrNi-Based Medium-Entropy Alloy Through Coherent L12 Nanoprecipitates and Grain Boundary Precipitates

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外文摘要：The L12-strengthened Co34Cr32Ni27Al4Ti3 medium-entropy alloy(MEA)with precipitations of grain boundaries has been developed through selective laser melting(SLM)followed by cold rolling and annealing,exhibiting excellent strength-ductil-ity synergy.The as-printed alloy exhibits low yield strength(YS)of～384 MPa,ultimate tensile strength(UTS)of～453 MPa,and uniform elongation(UE)of 1.5％due to the existence of the SLM-induced defects.After cold rolling and annealing,the YS,UTS,and UE are significantly increased to～739 MPa,～1230 MPa,and～47％,respectively.This enhancement primar-ily originates from the refined grain structure induced by cold rolling and annealing.The presence of coherent spherical γ'precipitates(L12 phases)and Al/Ti-rich precipitates at the grain boundaries,coupled with increased lattice defects such as dislocations,stacking faults,and ultrafine deformation twins,further contribute to the property's improvement.Our study highlights the potential of SLM in producing high-strength and ductile MEA with coherent L12 nanoprecipitates,which can be further optimized through subsequent rolling and annealing processes.These findings offer valuable insights for the development of high-performance alloys for future engineering applications.

外文关键词：

Medium-entropy alloySelective laser meltingPrecipitationStrengthDuctility

作者：

Leilei Li、Kaikai Song、Qingwei Gao、Changshan Zhou、Xiaoming Liu、Yaocen Wang、Xiaojun Bai、Chongde Cao

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作者单位：

School of Physical Science and Technology,Northwestern Polytechnical University,Xi'an 710016,China

Weihai Research Institute of Industrial Technology,Shandong University,Weihai 264209,China

Research and Development Institute of Northwestern,Polytechnical University in Shenzhen,Shenzhen 518057,China

基金：

国家自然科学基金国家自然科学基金国家自然科学基金Guangdong Provincial Science and Technology Program,ChinaShaanxi Provincial Science and Technology Program,ChinaForeign Senior Talents Program of Guangdong Province,China中央高校基本科研业务费专项Shenzhen Fundamental Research Program

项目编号：

5197118052271037519711792019B0909050092023-JC-ZD-23D5000230131JCYJ20210324122203010

出版年：

2024

DOI：

10.1007/s40195-023-01641-5

金属学报(英文版)

中国金属学会

金属学报(英文版)

CSTPCD

影响因子：0.77

ISSN：1006-7191

年,卷(期)：2024.37(1)

参考文献量66