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Microstructure and Wear Properties of Aluminum Matrix Composites Fabricated by Exothermic Dispersion Reaction in Al-TiO2-C System


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Microstructure and Wear Properties of Aluminum Matrix Composites Fabricated by Exothermic Dispersion Reaction in Al-TiO2-C System
ZHU He-guoCHEN ShiWU XuYUAN Yun-zhan
Department of Materials Science and Engineering,NUST,Nanjing 210094,China
exothermic dispersion reaction aluminum matrix composites grinds wear wear properties
The microstructure and the dry sliding wear properties of the composites fabricated by exothermic dispersion reaction in Al-TiO2-C system are investigated.The dry sliding wear test results indicate that the wear mass losses increase linearly with sliding distance.With the increase of the sliding velocity,the wear mass losses increase to 0.9 m/s and then decrease.When the C/TiO2 mole ratio is zero,the reinforcements of the composites are composed of α-Al2O3 particles and Al3Ti sticks.There are many accumulated debris on the wear surface,which is formed by de-bonding of lamina and creaking of the Al3Ti.With adding C powder,the wear properties are improved greatly due to decreasing Al3Ti.When the C/TiO2 mole ratios increase to 1,the Al3Ti almost disappears,the ultimate tensile strength of the composites increases greatly.The wear surface becomes smooth,the amount of grind particles on the wear surfaces decreases greatly,no lamina appears on the wear surface,and the thickness of the plastic deformation region under the wear subsurface increases relatively.The adhesion abrasion plays a main role in the wear process of the composites.


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Last Update: 2012-12-05