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CoCrFeMnNi high-entropy alloys reinforced with Laves phase by adding Nb and Ti elements

Published online by Cambridge University Press:  18 January 2019

Gang Qin ,
Zibo Li ,
Ruirun Chen Open the ORCID record for Ruirun Chen [Opens in a new window] ,
Huiting Zheng ,
Chenlei Fan ,
Liang Wang ,
Yanqing Su ,
Hongsheng Ding ,
Jingjie Guo  and
Hengzhi Fu
Gang Qin
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China
Zibo Li
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China
Ruirun Chen*
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China; and State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001, Harbin, China
Huiting Zheng
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China
Chenlei Fan
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China
Liang Wang
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China
Yanqing Su
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China
Hongsheng Ding
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China
Jingjie Guo
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China
Hengzhi Fu
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, 150001, Harbin, China
*
a)Address all correspondence to this author. e-mail: ruirunchen@hit.edu.cn
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Abstract

Laves phase plays a positive role in improving the strength of high-entropy alloys (HEAs); Nb and Ti elements have potential to promote Laves phase formation in some HEAs. For improving the strength of the face-centered cubic (FCC) CoCrFeMnNi HEA, a series of (CoCrFeMnNi)100−xNbx (atomic ratio: x = 0, 4, 8, 12, 16) and (CoCrFeMnNi)100−xTix (atomic ratio: x = 0, 2, 4, 6, 8, 12) HEAs were prepared by melting. The effects of Nb and Ti on the microstructure evolution and compressive properties of the CoCrFeMnNi HEAs were investigated. For (CoCrFeMnNi)100−xNbx HEAs, the second-phase (Laves and σ phase) volume fraction increased from 0 to 42%. The yield strength also increased gradually from 202 to 1010 MPa. However, the fracture strain decreased from 60% (no fracture) to 12% with increasing Nb content. For (CoCrFeMnNi)100−xTix HEAs, the yield strength increased from 202 to 1322 MPa. The Laves phase volume fraction also increased from 0 to 27%. However, the fracture strain decreased from 60% (no fracture) to 7.5% with increasing Ti content. Addition of Nb and Ti has a good effect on improving the strength of FCC CoCrFeMnNi HEA.

Keywords

high-entropy alloyslaves phasephase selectionmechanical properties
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 6 , 28 March 2019 , pp. 1011 - 1020
Copyright
Copyright © Materials Research Society 2019 

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