期刊
METALS
卷 7, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/met7090359
关键词
Al metal matrix composites; microstructure; mechanical properties; strengthening mechanism
资金
- National Natural Science Foundation of China [51601110, 51601109, 51375294, 51402189]
- China Postdoctoral Science Foundation [2016M601563]
- Natural Science Foundation of Shanghai [17ZR1440800, 14ZR1418800]
- Youth Teacher Development Program of Shanghai Universities [ZZGCD15100, ZZGCD15036]
- Program of Shanghai University of Engineering Science [2016-45]
Al2O3 nanoparticle-reinforced Al-12Si matrix composites were successfully fabricated by hot pressing and subsequent hot extrusion. The influence of weight fraction of Al2O3 particles on the microstructure, mechanical properties, and the corresponding strengthening mechanisms were investigated in detail. The Al2O3 particles are uniformly distributed in the matrix, when 2 and 5 wt. % of Al2O3 particles were added to the Al-12Si matrix. Significant agglomeration can be found in composites with 10 wt. % addition of Al2O3 nanoparticles. The maximum hardness, the yield strength, and tensile strength were obtained for the composite with 5 wt. % Al2O3 addition, which showed an increase of about 0-11%, 23%, and 26%, respectively, compared with the Al-12Si matrix. Meanwhile, the elongation increased to about -30%. The contribution of different mechanisms including Orowan strengthening, thermal mismatch strengthening, and load transfer strengthening were analyzed. It was shown that the thermal mismatch strengthening has a more significant contribution to strengthening these composites than the Orowan and load transfer strengthening mechanisms.
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