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Composition design, microstructure, and mechanical properties of novel Ti–Co–Ni–Zr complex concentrated alloys

Junxia Wu, Peiyou Li, Hongfeng Dong, Yuefei Jia, Yaling Liu, Wei Zhang and Mina Zhang

Abstract

The composition design of complex concentrated alloys originates from the composition design of amorphous alloys. To expand the composition design of alloys, herein, the compositions of novel Ti–Co–Ni–Zr complex concentrated alloys were obtained by the proportional mixing of Ti2Co intermetallics and Ni64Zr36 binary eutectic. The theory and method of this new alloy design are also discussed. The as-cast Ti28Co14Ni37.12Zr20.88, Ti30Co15Ni35.2Zr19.8, and Ti32 . Co16Ni33.3Zr18.7 alloys were composed of body-centered cubic TiNi and Ti2Ni phases. The Ti28Co14Ni37.12Zr20.88 alloy exhibited high yield strength (2 164 MPa) and compressive strength (2 539 MPa) under quasi-static compression at roomtemperature. The high strength of Ti28Co14Ni37.12Zr20.88 alloy is related to the precipitation of Ti2Ni along the grain boundary and the precipitation in the crystal. This paper validates that using the proportional mixing method of intermetallics and eutectic alloy is an effective method to design complex concentrated alloys with high strength.


Prof. Dr. Peiyou Li School of Materials Science and Engineering Shaanxi University of Technology East first ring road Hanzhong, 723001 People’s Republic of China Tel.: +86-0916-2641711 Fax.: +86-0916-2641711 Web: http://www.snut.edu.cn/

Funding statement: Authors acknowledge financial support from Natural Science Basic Research Program of Shaanxi Province (2020JQ-870), Zhejiang Postdoctoral Scientific Research Project (ZJ2019166), and Ningbo Natural Science Foundation (2019A610168).

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Received: 2021-01-03
Accepted: 2021-08-01
Published Online: 2021-11-05

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