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Effects of distribution and growth orientation of precipitates on oxidation resistance of Cu–Cu12–[Crx/(12+x)Ni12/(12+x)]5 alloys

Published online by Cambridge University Press:  28 September 2015

Yuehong Zheng ,
Xiaona Li ,
Lujie Jin ,
Kun Zhang  and
Chuang Dong
Yuehong Zheng
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China
Xiaona Li*
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China; and Changzhou Institute of Dalian University of Technology, Changzhou 213164, Jiangsu, China
Lujie Jin
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China
Kun Zhang
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China
Chuang Dong
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China; and Changzhou Institute of Dalian University of Technology, Changzhou 213164, Jiangsu, China
*
a)Address all correspondence to this author. e-mail: lixiaona@dlut.edu.cn
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Abstract

Cr is one of common alloying elements that improve the oxidation resistance of Cu. Its content and distribution are the two important factors that influence the oxidation resistance of alloys. In this paper, the cluster structure model of stable solid solutions was used for designing Cu–Cu12–[Crx/(12+x)Ni12/(12+x)]5 (x = 1, 2, 4, 6 or 8) alloys. The insoluble antioxidative Cr was uniformly distributed in the Cu matrix with the help of Ni element. The solid solution and precipitation of alloys were effectively controlled by changing the Cr/Ni ratio, and the effects of the distribution of alloying elements on the oxidation resistance of Cu alloy were discussed. The studies on isothermal oxidation at 850 °C show that element Cr of the Cu–Ni–Cr alloys designed using cluster model can be dispersed in the Cu matrix, and a continuous protective Cr-rich oxide layer can be formed when the Cr content dispersed in the alloys reaches 9.26 at% during isothermal oxidation. 1/2 of Cr in the Cu–Ni–Cr alloys is replaced by Fe, forming Cu–Ni–(Cr + Fe) alloys; oxide precipitates exhibit a columnar structure revealing the orientation of growth perpendicular to the matrix, thereby forming a lot of O diffusion channels and resulting in a sharp decline in its oxidation resistance. Therefore, the growth morphology of the oxide precipitates may significantly affect the oxidation resistance.

Keywords

copperoxidationscanning electron microscopy
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 21 , 13 November 2015 , pp. 3299 - 3306
Copyright
Copyright © Materials Research Society 2015 

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Footnotes

Contributing Editor: Yang-T. Cheng

References

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