Abstract
Experiments of thermal shock damage on a piston were conducted by a shaped high-power laser. The microstructure of thermal shock damaged specimen was characterized by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). The mechanical properties of the thermal shock specimen were evaluated by microhardness and the corresponding damaged mechanisms were discussed. The results show that cracks originated from the interface of the Al-matrix and intermetallic phase due to the thermal and mechanical mismatch between the brittle components of the microstructure and the surrounding ductile matrix. Oxides of thermal shock crack can accelerate the damage of the piston. There exists a decline in the microhardness of the piston at all locations after thermal shock tests due to the comprehensive effects of the nonequilibrium distribution of the temperature and cooling method.
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