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Effects of trace La additions on the microstructures and properties of nanoprecipitates strengthened Cu–Zr alloys

Published online by Cambridge University Press:  23 December 2014

Tongmin Wang ,
Mingyu Li ,
Huijun Kang ,
Wei Wang ,
Cunlei Zou  and
Zongning Chen
Tongmin Wang*
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China
Mingyu Li
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China
Huijun Kang*
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China
Wei Wang
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China
Cunlei Zou
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China
Zongning Chen
Affiliation:
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education), School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, China
*
a)Address all correspondence to these authors. e-mail: tmwang@dlut.edu.cn
b)e-mail: kanghuijun@dlut.edu.cn
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Abstract

The effects of trace La additions on the microstructures and mechanical properties of Cu–0.2 wt% Zr alloy have been investigated. Traditional thermo-mechanical processing was applied to the Cu–Zr alloys. Isochronal aging and isothermal aging were used to optimize the aging conditions. According to the hardness and conductivity tests, the optimized aging condition should be 150 min isothermal holding at 400 °C following 85% cold-rolling. If the as-cast sample is subjected to aging, the addition of La obviously refines the microstructures. After cold-rolling, however, the La addition has no significant effects on the grain size of the aged sample. SEM and TEM are combined to observe the distribution and morphology of the precipitates, which are identified to be Cu5Zr. The addition of La can improve the hardness and conductivity simultaneously in the as-cast samples after aging, while it improves the hardness and strength and decreases the conductivity slightly in the cold-rolled samples after aging. XRD and TEM results show that the lattice parameter and the dislocation density are increased by the addition of La.

Keywords

nonferrous alloysmechanical characterizationthermo-mechanical processingaging hardeningprecipitation
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 2 , 28 January 2015 , pp. 248 - 256
Copyright
Copyright © Materials Research Society 2015 

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