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Microstructure modification and resultant mechanical properties of Mg–6Zn–1.5Ca (wt%) alloy through hot extrusion

Published online by Cambridge University Press:  15 February 2018

Yuzhou Du ,
Mingyi Zheng  and
Bailing Jiang
Yuzhou Du*
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, People’s Republic of China; and Shaanxi Province Engineering Research Center for Magnesium Alloys, Xi’an University of Technology, Xi’an 710048, People’s Republic of China
Mingyi Zheng
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Bailing Jiang
Affiliation:
School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, People’s Republic of China; and Shaanxi Province Engineering Research Center for Magnesium Alloys, Xi’an University of Technology, Xi’an 710048, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The microstructure and tensile property of extruded Mg–6Zn–1.5Ca (wt%) alloy were examined by means of electron backscattered diffraction, scanning and transmission electron microscopy. A bimodal microstructure featuring fine dynamically recrystallized (DRXed) grains with weaker texture and coarse-deformed region with strong basal texture and fine precipitates was achieved in the as-extruded Mg–Zn–Ca alloy, which resulted in a yield strength as high as 305 MPa and a moderate elongation to fracture of 8.6%. Dynamic precipitation was detected in the deformed region, which inhibited the dynamic recrystallization process. The texture intensity in the DRXed region was weakened compared with that in the deformed region, which was associated with the preferred nucleation during dynamic recrystallization. Such texture weakening effects gave rise to an obvious ductility improvement for the as-annealed alloy.

Keywords

Mgtexturesecond phase
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 8 , 27 April 2018 , pp. 1003 - 1010
Copyright
Copyright © Materials Research Society 2018 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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