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Effect of ECAP temperature on precipitation and strengthening mechanisms of Mg–9Al–1Si alloys

Published online by Cambridge University Press:  21 May 2018

Pengwen Zhou ,
Hongxia Wang ,
Huihui Nie ,
Weili Cheng ,
Xiaofeng Niu ,
Zhiwen Wang  and
Wei Liang
Pengwen Zhou
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Hongxia Wang*
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Huihui Nie
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Weili Cheng*
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Xiaofeng Niu
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Zhiwen Wang*
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Wei Liang
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

The effect of equal-channel angular pressing (ECAP) at various temperatures (310, 330, and 350 °C) on precipitations and strengthening mechanisms of Mg–9Al–1Si alloys was investigated. The results indicated that the average grain size decreased gradually with decreasing of ECAP temperature. The distribution of the Mg2Si phase changed a little when the ECAP temperature increased. However, the different morphologies of β-Mg17Al12 phase were observed, including continuous and uncontinuous precipitation of particles at 310 and 350 °C. The continuous β-Mg17Al12 phase was hardly found and the refined β-Mg17Al12 phase was distributed dispersedly in the matrix at 330 °C. Thus, the mechanical properties of the Mg–9Al–1Si alloy was optimum: ultimate tensile strength and elongation were ∼350.8 MPa and ∼14.77%, respectively. It can be deduced that both grain refinement strengthening and precipitation strengthening play significant roles in strength increment of the alloy during the ECAP process. However, precipitation strengthening is the predominant mechanism.

Keywords

ECAPtemperatureprecipitation strengtheninggrain refinement strengtheningmechanical properties
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 12 , 28 June 2018 , pp. 1822 - 1829
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Copyright
Copyright © Materials Research Society 2018 

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