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Development of Mg–Zn–Y–Ca alloys containing icosahedral quasicrystal phase through trace addition of Y

Published online by Cambridge University Press:  31 August 2018

Kaibo Nie*
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China; and Shanxi key laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, Taiyuan 030024, China
Xinkai Kang
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China
Kunkun Deng
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China; and Shanxi key laboratory of Advanced Magnesium-based Materials, Taiyuan University of Technology, Taiyuan 030024, China
Yachao Guo
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China
Jungang Han
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China
Zhihao Zhu
Affiliation:
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected], [email protected]
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Abstract

In this work, three Mg–Zn–Y–Ca alloys reinforced by icosahedral quasicrystal phase through trace Y addition were extruded at a low temperature of 503 K. With increasing the contents of Zn and Y, the grain size of the as-extruded alloy was significantly reduced while both the size and volume fraction of nanosized precipitates were increased. The grain refinement in the Mg–Zn–Y–Ca alloy was related to dynamical recrystallization during extrusion and the pinning effect of nanosized precipitates on the grain boundaries. After extrusion, the yield strength (YS) and ultimate tensile strength (UTS) of the three alloys were significantly increased. The YS of 294.0 MPa, UTS of 337.5 MPa, and elongation of 10.6% were obtained in the case of Mg–2.09Zn–0.26Y–0.12Ca (at.%) alloys. The improvement in the mechanical properties could mainly be due to the grain boundary strengthening and Orowan strengthening. The as-cast alloy exhibited a typical cleavage fracture while the as-extruded alloy possessed a mixture fracture of dimple fracture and cracking along the twinning.

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Article
Copyright
Copyright © Materials Research Society 2018 

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References

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