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Microstructure characteristics and mechanical properties of a 2A66 Al–Li alloy processed by continuous repetitive upsetting and extrusion

Published online by Cambridge University Press:  01 July 2016

Wenli Gao ,
Juan Xu ,
Jie Teng  and
Zheng Lu
Wenli Gao*
Affiliation:
Department of Materials Forming and Control, College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, People's Republic of China
Juan Xu
Affiliation:
Department of Materials Forming and Control, College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, People's Republic of China
Jie Teng
Affiliation:
Department of Metal Materials Science and Engineering, College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, People's Republic of China
Zheng Lu
Affiliation:
Institute of Aluminum and Magnesium Alloy, Beijing Institute of Aeronautical Material, Beijing 100095, People's Republic of China; and Beijing Advanced Engineering and Application Research Center of Aluminum Materials, Beijing 100095, People's Republic of China
*
a) Address all correspondence to this author. e-mail: wenligaohd@163.com
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Abstract

Continuous repetitive upsetting and extrusion (CRUE) processing was performed to investigate its effects on microstructures, mechanical properties and texture characteristics of a 2A66 Al–Li alloy. The results show that the average grain size is effectively refined from initial as-extruded ∼140 µm to ∼4 µm after 3 CRUE passes. The grain refinement is the combined effect of continuous dynamic recrystallization and discontinuous dynamic recrystallization. The texture intensity tends to be weaker and new cube texture is gradually developed with increasing CRUE passes. In addition, the fraction of high angle grain boundaries increases to 86.37% after 3 CRUE passes. Tensile test results reveal that the ductility is greatly enhanced with modest reduction in strength after CRUE processing. The variation in mechanical properties may be mainly due to the decrease of dislocation density and weakening of texture.

Keywords

microstructuregrain sizetexture
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 16 , 29 August 2016 , pp. 2506 - 2515
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Copyright
Copyright © Materials Research Society 2016 

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