The effects of hot pressing temperature on microstructures and tensile properties of 15% (volume fraction) SiCp/2009Al composites were investigated in this paper. The relative density of the composites increased rapidly with increasing the hot pressing temperature up to 580 ℃ and decreased with further increasing the temperatures. TEM observations revealed that the interface bonding was quite weak with the interface crack when the hot pressing temperature was below 560 ℃. When the composites were hot pressed at 580 and 600 ℃, the interface was clean and had a good interface bonding. The MgAl2O4 and Al4C3 formed at the interfaces when the hot pressing temperature was above 620 ℃. Tensile tests indicated that the composite fabricated at 580 ℃ exhibited the optimum strengtand ductility. Fractography revealed that for the composite fabricated at the hot pessing temperture below 560 ℃, the fracture mechanism was mainly the interfacial debonding. For the compositfabrcated at 580 and 600 ℃, the fracture mechanism of the composite was the matrix ductile fracture and the SiC particle fracture, When the hot pressing temperature was above 620 ℃, the interface fractured along MgAl2O4 and Al4C3, and the fracture mechanism of the composite was the matrix ductile fracture, the interface crack and the particle fracture.
JIN Peng
,
XIAO Ba-Lv
,
YU Quan-Zhao
,
MA Zong-Xi
,
LIU Huo
,
LI Shu
. EFFECT OF HOT PRESSING TEMPERATURE ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF SiC PARTICLE REINFORCED ALUMINUM
MATRIX COMPOSITES[J]. Acta Metall Sin, 2011
, 47(3)
: 298
-304
.
DOI: 10.3724/SP.J.1037.2010.00413
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