Synthesis, characterisation and mechanical properties of SiC reinforced Al based nanocomposites processed by MA and SPS

被引:33
作者
Al-Aqeeli, N. [1 ]
Abdullahi, K. [1 ]
Hakeem, A. S. [2 ]
Suryanarayana, C. [3 ]
Laoui, T. [1 ]
Nouari, S. [1 ]
机构
[1] King Fahd Univ Petr & Minerals, Dept Mech Engn, Dhahran 31261, Saudi Arabia
[2] King Fahd Univ Petr & Minerals, Ctr Excellence Nanotechnol CENT, Dhahran 31261, Saudi Arabia
[3] Univ Cent Florida, Dept Mech Mat & Aerosp Engn, Orlando, FL 32816 USA
关键词
Aluminium alloys; Silicon carbide; Mechanical alloying; Spark plasma sintering; Microstructure; Hardness; STRUCTURAL EVOLUTION; PARTICLES; POWDERS;
D O I
10.1179/1743290112Y.0000000029
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
Al based alloys reinforced with different amounts (5, 12 and 20 wt-%) of nanosized SiC particulates were synthesised by mechanical alloying and consolidated by the spark plasma sintering (SPS) technique. The distribution of the reinforcement phase in the composite was evaluated as a function of the milling time and the amount of SiC. The processed materials were characterised by scanning electron microscopy and energy dispersive spectroscopy for the morphology and composition and X-ray diffraction. Continuous reduction in crystallite size was observed as milling progressed and after milling for 20 h the resulting powders reached a grain size of <100 nm. These Al-SiC composites were successfully consolidated by the SPS method at different sintering temperatures of 400, 450 and 500 degrees C. It is suggested that a higher hardness can be achieved even at 20 wt-% SiC when a higher sintering temperature, for example, above 500 degrees C, is used.
引用
收藏
页码:149 / 157
页数:9
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