2Ca phase; Microstructure; Mechanical property."/> 2Ca phase along grain boundaries. After extrusion, grains of the matrix are refined further and the Al2Ca phase broke into particulates. Moreover, the Al2Ca phase and grain size can be further refined by the addition of SiCp. As compared with monolithic Mg–5Al–2Ca alloy, the addition of SiCp conduces to obvious improvement of TYS and work hardening rate, however, at the expense of elongation. Unlike the TYS, the UTS of SiCp/Mg-5Al-2Ca composite does not change monotonously with increasing SiCp’s content, the highest UTS appears when the SiCp’s volume fraction is 5%. The interfacial debonding between SiCp and Al2Ca phase and cracked particles are considered as the main crack source for SiCp/Mg–5Al–2Ca composite."/>

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Effects of SiCp content on the microstructure and mechanical properties of SiCp/Mg–5Al–2Ca composites
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National center for materials service safety,University of Science and Technology,Beijing,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials, College of Materials Science and Engineering, Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology,Shanxi key laboratory of advanced magnesium-based materials,College of Materials Science and Engineering,Taiyuan University of Technology

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    Abstract:

    The Mg–5Al–2Ca alloys reinforced by 2 vol.%, 5 vol.% and 10 vol.% 5μm SiCp were fabricated by stir casting. The cast composites were subject to hot extrusion. In the cast composites, addition of SiCp disturbs the network distribution of Al2Ca phase along grain boundaries. After extrusion, grains of the matrix are refined further and the Al2Ca phase broke into particulates. Moreover, the Al2Ca phase and grain size can be further refined by the addition of SiCp. As compared with monolithic Mg–5Al–2Ca alloy, the addition of SiCp conduces to obvious improvement of TYS and work hardening rate, however, at the expense of elongation. Unlike the TYS, the UTS of SiCp/Mg-5Al-2Ca composite does not change monotonously with increasing SiCp’s content, the highest UTS appears when the SiCp’s volume fraction is 5%. The interfacial debonding between SiCp and Al2Ca phase and cracked particles are considered as the main crack source for SiCp/Mg–5Al–2Ca composite.

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[Hai Chang, Cui-ju Wang, Kun-kun Deng, Kai-bo Nie, Kun Su, Ling Liao, Hong-xia Wang. Effects of SiCp content on the microstructure and mechanical properties of SiCp/Mg–5Al–2Ca composites[J]. Rare Metal Materials and Engineering,2018,47(5):1377~1384.]
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History
  • Received:April 10,2017
  • Revised:August 14,2017
  • Adopted:November 08,2017
  • Online: June 08,2018
  • Published: