Cr-based second phases in a high conductivity Cu-Cr-Nb alloy with high high-temperature strength

Yihai Yang; Qian Lei; Huan Liu; Jianda Hong; Zhen Han; Qi An; Jimin Shan; Xi Chen; Haoran Xu; Zhu Xiao; Shen Gong

Materials & Design (Jul 2022)

Cr-based second phases in a high conductivity Cu-Cr-Nb alloy with high high-temperature strength

Yihai Yang,
Qian Lei,
Huan Liu,
Jianda Hong,
Zhen Han,
Qi An,
Jimin Shan,
Xi Chen,
Haoran Xu,
Zhu Xiao,
Shen Gong

Affiliations

Yihai Yang: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
Qian Lei: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China; Corresponding author.
Huan Liu: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
Jianda Hong: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
Zhen Han: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
Qi An: School of Information Science and Engineering, Hunan Institute of Science and Technology, Yueyang 414000, China
Jimin Shan: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
Xi Chen: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
Haoran Xu: State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China
Zhu Xiao: School of Materials Science and Engineering, Central South University, Changsha 410083, China
Shen Gong: School of Materials Science and Engineering, Central South University, Changsha 410083, China

Journal volume & issue: Vol. 219
p. 110784

Abstract

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Cu-Cr-Nb alloys have attracted many researchers’ interest for decades while their structure and second phases inside were unclear. We have characterized the second phase particles formed during solidification, hot rolling, and aging treatments in a Cu-4.06Cr-1.25Nb alloy. Face-centered-cubic (FCC) Cr, L12 Cr3Cu, C14 Cr2Nb, C15 Cr2Nb, and Nb-rich particles were detected in the alloy. The crystal structure, precipitation, phase transformation behavior and orientation relationship (OR) were uncovered. C15 Cr2Nb particles formed in the solidification process while C14 Cr2Nb particles precipitated as aged at 600 °C. The competition of nucleation between nano-scale Cr3Cu and Cr2Nb particles aged at 600 °C was discussed. The nucleation of L12 Cr3Cu was prior to that of C14 Cr2Nb, and the precipitation of Cr2Nb particles would limit the coarsening of Cr particles. A phase transformation map during age treatment was established on the basis of transmission electron microscope (TEM) images and X-ray diffraction (XRD) patterns. These findings are helpful in developing high-performance Cu-Cr-Nb alloys.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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