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Microstructure evolution of Cu–0.2Mg alloy during continuous extrusion process

Published online by Cambridge University Press:  04 September 2015

Yuan Yuan ,
Cheng Dai ,
Zhou Li ,
Guang Yang ,
Yue Liu  and
Zhu Xiao
Yuan Yuan
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China; and China Railway Construction Electrification Bureau Group Kang Yuan New Materials CO., LTD, Jiangyin 214521, China
Cheng Dai
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Zhou Li*
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China; and State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
Guang Yang
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Yue Liu
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China
Zhu Xiao
Affiliation:
School of Materials Science and Engineering, Central South University, Changsha 410083, China; and Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Changsha 410083, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this study, scanning electron microscope, electron backscatter diffraction, and transmission electron microscope have been used to investigate the microstructure evolution of Cu–0.2Mg alloy during continuous extrusion in mass production. The continuous extrusion could change the size and orientation of as-cast crystallite grains of the alloy. Hardness increased gently in upsetting zone and dropped sharply in adhesion zone. Hardness reached the maximum value in right-angle bending zone; and it decreased rapidly in extending extrusion zone. Upsetting zone was mainly composed of cell blocks and microbands, and adhesion zone mainly consisted of discontinuous recrystallize grain. Shear band and subgrains were formed in right-angle bending zone due to polygonization during shear deformation. In extending extrusion zone and extrusion rod zone, recrystallize microstructures were predominant.

Keywords

Cu–Mg alloyultrafine grain materialscontinuous extrusion processmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 18 , 28 September 2015 , pp. 2783 - 2791
Copyright
Copyright © Materials Research Society 2015 

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