Al-20Si/SiCp composite was fabricated by spray deposition.The thermal fatigue behavior of Al-20Si/SiCp composite was investigated in the water-quench method.Optical microscopy(OM) and scanning electron microscopy(SEM) were used to examine the damage mechanisms of thermal fatigue.Almost all the primary fatigue cracks at an elevated temperature initiated at V-notch.After several thermal cycles,the speed rate of crack propagation decreased with the relative density of composite increase.Because-Al matrix could...