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Effects of SiCp Content on the Microstructure and Mechanical Properties of SiCp/Mg-5Al-2Ca Composites
- Source :
- Rare Metal Materials and Engineering. 47:1377-1384
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- The Mg-5Al-2Ca alloys reinforced by 2vol%, 5vol% and 10vol% 5 μm 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 break into particulates. Moreover, the Al2Ca phase and grain size can be further refined by the addition of SiCp. Compared with Mg-5Al-2Ca alloy, the addition of SiCp introduces obvious improvement of tensile yield strength (TYS) and work hardening rate, however, at the expense of elongation. Unlike the TYS, the ultimate tensile strength (UTS) of SiCp/Mg-5Al-2Ca composite does not change monotonously with increasing SiCp's content, and 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.
- Subjects :
- 010302 applied physics
Materials science
Composite number
General Engineering
02 engineering and technology
Work hardening
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
Grain size
0103 physical sciences
Ultimate tensile strength
Volume fraction
Extrusion
Grain boundary
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 18755372
- Volume :
- 47
- Database :
- OpenAIRE
- Journal :
- Rare Metal Materials and Engineering
- Accession number :
- edsair.doi...........58590f019a505945a7fd8a75fa10767a