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Effects of titanium addition on microstructure and mechanical properties of CrFeNiTix (x = 0.2–0.6) compositionally complex alloys

Published online by Cambridge University Press:  05 March 2019

Shuo Gao
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China; Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, Xu’zhou 221116, China; and Xuzhou City Key Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xu’zhou 221116, China
Teng Kong
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China
Man Zhang
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China
Xiao Chen
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China
Yan Wei Sui*
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China; Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipments, Xu’zhou 221116, China; and Xuzhou City Key Laboratory of High Efficient Energy Storage Technology and Equipments, China University of Mining and Technology, Xu’zhou 221116, China
Yao Jian Ren
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China
Ji Qiu Qi
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China
Fu Xiang Wei
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China
Ye Zeng He
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China
Qing Kun Meng
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China
Zhi Sun*
Affiliation:
School of Materials Science and Engineering, China University of Mining and Technology, Xu’zhou 221116, China
*
a)Address all correspondence to these authors. e-mail: wyds123456@outlook.com
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Abstract

CrFeNiTix (x = 0.2, 0.3, 0.4, 0.5, and 0.6 molar ratio) compositionally complex alloys were fabricated by vacuum arc melting to investigate the microstructure, hardness, and compressive properties. The results revealed that CrFeNiTix alloys consisted of the principal face-centered cubic (FCC) phase and body-centered cubic (BCC) solid solution, with an amount of (Ni, Ti)-rich hexagonal close-packed phase. CrFeNiTix alloys exhibited the typical dendrite. Ti0.2 and Ti0.3 alloys were composed of FCC and BCC solid solutions in the dendrite, as well as ε (Ni3Ti) and R (Ni2.67Ti1.33) phases in the inter-dendrite, simultaneously. For Ti0.4, Ti0.5, and Ti0.6 alloys, (Fe, Cr)-rich solid solution separated out and ε phase transformed into R phase gradually. Meanwhile, TEM analysis indicated that Ti0.4 alloy matrix consisted of the principal FCC phase containing (Ni, Ti)-rich intragranular nanoprecipitates. The hardness values of CrFeNiTix alloys were increased with the addition of Ti content and the high compressive strength of CrFeNiTix alloys was maintained, which was attributed to the solid solution strengthening and precipitation hardening.

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Article
Copyright
Copyright © Materials Research Society 2019 

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