Bidirectional improvement of strength and ductility of CoCrFeNiTi (Co40Cr16Fe35Ni8Ti1) high-entropy alloys suitable for coronary stents

被引：8

作者：

Chen, Xiaohong ^{[2
]}

Lu, Qingqing ^{[1
]}

Gao, Yuhang ^{[2
]}

Tian, Wei ^{[1
]}

Wang, Hao ^{[2
]}

Zhou, Honglei ^{[2
]}

Fu, Shaoli ^{[2
]}

Liu, Ping ^{[2
]}

Wang, Xinjiao ^{[1
]}

Jiang, Tao ^{[2
]}

Wan, Maoyuan ^{[1
]}

机构：

[1] Univ Shanghai Sci & Technol, Coll Sci, Shanghai 200093, Peoples R China

[2] Univ Shanghai Sci & Technol, Sch Mat Sci & Engn, Shanghai 200093, Peoples R China

来源：

JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2022年 / 18卷

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

HEA; Strength; Ductility; Hank's simulated body; MECHANICAL-PROPERTIES; CORROSION-RESISTANCE; TENSILE PROPERTIES; HIGH-TEMPERATURE; MICROSTRUCTURE; BEHAVIOR; STRAIN; CR;

D O I：

10.1016/j.jmrt.2022.03.084

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new type of non-equivalent atomic ratio Co40Fe35Cr16Ni8Ti1 HEA that can be used as an alternative material for coronary stents was successfully designed and synthesized, and one of its main features was the low Ni and containing Ti, which made it have good biocompatibility while also achieving the bidirectional improvement of strength-ductility. XRD tests showed that Co40Fe35Cr16Ni8Ti1 HEA had precipitation of R and Laves phases. SEM tests equipped with EDS showed that Co40Fe35Cr16Ni8Ti1 HEA with grains and grain boundaries corroded by aqua regia appeared rich Ni & Ti elements and rich Co & Ti elements at different locations, which matched the R and Laves phases shown in XRD respectively. EBSD test showed that Co40Fe35Cr16Ni8Ti1 HEA had a smaller proportion of deformed grains and a higher proportion of small-angle grain boundaries, and the grain size of Co40Fe35Cr16Ni8Ti1 had a more typical bimodal structure, which indicates that it was a perfect combination of both high strength and high ductility. Tensile experiments showed that the yield strength and ductility of Co40Fe35Cr16Ni8Ti1 HEA had reached the upper limit of ASTM F90. The Tafel test showed that Co40Fe35Cr16Ni8Ti1 HEA also had excellent corrosion resistance. (c) 2022 The Author(s). Published by Elsevier B.V.

引用

页码：1934 / 1946

页数：13

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