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Microstructures and mechanical properties of as-ECAPed Mg–8Sn alloys with the combined addition of Zn and Al

Published online by Cambridge University Press:  18 April 2017

Wei-li Cheng ,
Liang Tian ,
Yang Bai ,
Shi-chao Ma  and
Hong-xia Wang
Wei-li Cheng*
Affiliation:
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China; and Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, China
Liang Tian
Affiliation:
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Yang Bai
Affiliation:
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Shi-chao Ma
Affiliation:
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Hong-xia Wang
Affiliation:
School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

A “RE-free” and I-phase-containing Mg–8Sn-based alloy system was developed and successfully fabricated through the equal channel angular pressing (ECAP) process. The influence of the Zn/Al mass ratio on the microstructures and mechanical properties of the as-ECAPed Mg–8Sn–(5,6,7)Zn–2(wt%)Al alloys was investigated using an optical microscope, an X-ray diffractometer, a scanning electron microscope, a transmission electron microscope, and a universal testing machine. Grain size, dynamic recrystallization behavior, and texture were found to be greatly affected by the Zn/Al mass ratio. Furthermore, the ultimate tensile strength (250 MPa) and elongation (14.5%) of the alloy with a Zn/Al mass ratio of 3 were considerably increased compared to those of the as-ECAPed alloys with Zn/Al ratios of 2.5 and 3.5 (ultimate tensile strength and elongation of 215 MPa and 13% and 184 MPa and 10%, respectively). This significant enhancement was attributed to extensive grain boundary strengthening, precipitation strengthening, and higher work hardening capacity as well as texture randomization. The strength and ductility of the as-ECAPed alloys are also discussed in terms of the I-phase and Mg2Sn formation.

Keywords

magnesium alloyZn/Al mass ratiotextureprecipitationmechanical property
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 12 , 28 June 2017 , pp. 2315 - 2324
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jörg F. Löffler

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