Studies on wear behavior of nano-intermetallic reinforced Al-base amorphousanocrystalline matrix in situ composite

摘要

Resistance to wear is an important factor in design and selection of structural components in relative motion against a mating surface. The present work deals with studies on fretting wear behavior of in situ nano-Al_3Ti reinforced Al-Ti-Si amorphousanocrystalline matrix composite, processed by high pressure (8 GPa) sintering at room temperature, 350, 400 or 450℃. The wear experiments were carried out in gross slip fretting regime to investigate the performance of this composite against Al_2O_3 at ambient temperature (22-25℃) and humidity (50-55%). The highest resistance to fretting wear has been observed in the composites sintered at 400℃. The fretting wear involves oxidation of Al_3Ti particles in the composite. A continuous, smooth and protective tribolayer is formed on the worn surface of the composite sintered at 400℃, while fragmentation and spallation leads to a rougher surface and greater wear in the composite sintered at 450℃.