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Materials 2018, 11(1), 136; doi:10.3390/ma11010136

Microstructure and Tensile Properties of ECAPed Mg-9Al-1Si-1SiC Composites: The Influence of Initial Microstructures

1
Shanxi Key Laboratory of Advanced Magnesium-Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2
Southwest Technique and Engineering Research Institute, Chongqing 400039, China
*
Authors to whom correspondence should be addressed.
Received: 10 December 2017 / Revised: 2 January 2018 / Accepted: 11 January 2018 / Published: 15 January 2018
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Abstract

Mg-9Al-1Si-1SiC composites with various initial microstructures prior to equal channel angular pressing (ECAP) were obtained by different pre-treatments (without and with homogenization treatment), and the resultant grain size, second phase and tensile properties of ECAPed composites were reported. The ECAPed composite with homogenization treatment (HT) exhibited finer grain size, higher fraction of dynamically recrystallized (DRXed) grains, weaker texture intensity, as well as the presence of dynamic precipitated Mg17Al12 phase compared to that without HT. Besides, the morphology of pre-existing Mg2Si changed from massive-like to needle-like in the ECAPed composite with HT. Room-temperature tensile test results showed that ultimate tensile strength (UTS), yield strength (YS), and elongation (El) of ECAPed composites with HT were 16.1%, 23%, and 27.3% larger than that without HT, respectively. View Full-Text
Keywords: Mg-9Al-1Si-1SiC composite; homogenization treatment; ECAP; microstructure; mechanical properties Mg-9Al-1Si-1SiC composite; homogenization treatment; ECAP; microstructure; mechanical properties
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Zhang, S.; Li, M.; Wang, H.; Cheng, W.; Lei, W.; Liu, Y.; Liang, W. Microstructure and Tensile Properties of ECAPed Mg-9Al-1Si-1SiC Composites: The Influence of Initial Microstructures. Materials 2018, 11, 136.

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