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Compression deformation behavior of semisolid Al2O3np reinforced 7075 aluminum matrix composites with high solid fraction

Published online by Cambridge University Press:  21 November 2016

Xiuliang Zou ,
Hong Yan  and
Xiaohui Chen
Xiuliang Zou
Affiliation:
School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China; and Key Laboratory of Light Alloy Preparation & Processing in Nanchang City, Nanchang 330031, China
Hong Yan*
Affiliation:
School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China; and Key Laboratory of Light Alloy Preparation & Processing in Nanchang City, Nanchang 330031, China
Xiaohui Chen
Affiliation:
School of Mechanical and Electrical Engineering, Nanchang University, Nanchang 330031, China; and Key Laboratory of Light Alloy Preparation & Processing in Nanchang City, Nanchang 330031, China
*
a) Address all correspondence to this author. e-mail: yanhong_wh@163.com
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Abstract

Semisolid forging is a type of semisolid metal processing with high solid fraction. However, the presence of nanosized particles has strong influences on flow behavior of the composites in the semisolid forging process. In this study, the compression deformation behavior of nanosized Al2O3 particles (Al2O3np) reinforced 7075 aluminum matrix composites with high solid fraction was investigated by conducting semisolid isothermal compression experiment. The microstructures after semisolid compression were characterized. The results showed that the true stress decreased with the increase of the deformation temperature and size of Al2O3np, the decrease of the strain rate and mass fraction of Al2O3np. After semisolid compression, deformation degree in large deformation zone was larger than that in free deformation zone. Besides, the solid grains in large deformation zone showed evidence of having undergone different degrees of plastic deformation under different deformation conditions. Simultaneously, the deformation mechanisms during the semisolid compression process were discussed.

Keywords

semisolid forgingaluminum matrix compositesnanosized Al2O3 particlescompression deformation behaviordeformation mechanisms
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 24 , 28 December 2016 , pp. 3981 - 3990
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Copyright
Copyright © Materials Research Society 2016 

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