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Role of Ru on the microstructure and property of novel Co–Ti–V Superalloy

Published online by Cambridge University Press:  10 September 2020

Pengjie Zhou ,
Xinkang Gao ,
Dehang Song ,
Qilong Liu ,
Yinbing Liu  and
Jun Cheng
Pengjie Zhou*
Affiliation:
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang212003, China
Xinkang Gao
Affiliation:
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang212003, China
Dehang Song
Affiliation:
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang212003, China
Qilong Liu
Affiliation:
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang212003, China
Yinbing Liu
Affiliation:
School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang212003, China
Jun Cheng
Affiliation:
Northwest Institute for Nonferrous Metal Research, Shanxi Key Laboratory of Biomedical Metal Materials, Xi'an 710016, China State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
*
a)Address all correspondence to this author. e-mail: zhoupengjie@just.edu.cn
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Abstract

In the present paper, the authors investigated the microstructures and mechanical properties of dual-phase Co–Ti–V-based superalloys with different additions of Ru. The results showed that with the increase of Ru contents, the size of γ′ precipitates of the alloy gradually raised, the volume fraction of γ′ phase slightly, and the lattice misfit between γ/γ′ phases increased. Ru was enriched in the γ′ phase, and the elemental partition coefficients (KX = Cγ′/Cγ) of Ti and V increased with the increment of Ru. The Ru contents have no remarkable influence on the solvus temperatures of γ′ in the Co–Ti–V alloys. The yield strength at 1000 °C of the Co–10Ti–11V–0.5Ru alloy was the highest, while the yield strength of the 1Ru alloy was the smallest. Transmission electron microscopy and scanning electron microscopy observations showed that the γ′ shape in the compressed specimen containing 0.5Ru remain integrated, while the γ′ in other alloys were cut into several parts.

Keywords

RustrengthCoCo–Ti–V alloymisfitmicrostructural morphologymechanical properties
Type
Article
Information
Journal of Materials Research , Volume 35 , Issue 20 , 28 October 2020 , pp. 2737 - 2745
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of Materials Research Society

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