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Microstructure and mechanical properties of Mg–4Zn–xY alloys prepared by hot-extrusion

Published online by Cambridge University Press:  01 June 2015

Jibao Li ,
Feng Wang ,
Pingli Mao  and
Zheng Liu
Jibao Li
Affiliation:
School of Material Science and Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China
Feng Wang*
Affiliation:
School of Material Science and Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China
Pingli Mao
Affiliation:
School of Material Science and Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China
Zheng Liu
Affiliation:
School of Material Science and Engineering, Shenyang University of Technology, Shenyang, Liaoning 110870, China
*
a)Address all correspondence to this author. e-mail: wf9709@126.com
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Abstract

To investigate the effect of Y element and hot-extrusion on microstructure and mechanical properties of the three alloys which are Mg–4Zn–xY (x = 1, 2, 3 in wt%). All the three alloys are hot-extruded and analyzed. The results show that as Y is increased, the microstructures of the as-cast alloys are more refined and the phase compositions are changed from both I-phase and W-phase to single W-phase whose structure is changed from mix of net and spheroidization to continuous net. The mechanical properties are increased to a small extent mainly due to the refining effect of Y. After hot-extrusion, coarse dendrite crystals are broken and dynamic recrystallization appears which obviously refine the microstructure. Second phases are redistributed along the extrusion direction. W-phases are twisted and broken, while I-phases are spheroidized. Tensile strengths and elongations are all increased by around 100% compared with the as-cast alloys.

Keywords

Mg–4Zn–xY alloysmicrostructuremechanical propertieshot-extrusion
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 12 , 28 June 2015 , pp. 1965 - 1972
Copyright
Copyright © Materials Research Society 2015 

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References

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