采用有限元数值计算方法研究了冷喷涂过程中Cu粒子与Cu基体的碰撞变形行为,探讨了粒子速度、温度对其碰撞基体后的变形行为、界面温度变化与粒子和基体的接触面积的影响.结果表明,随粒子碰撞速度的增加,粒子扁平率与碰撞界面温度增加、接触面积增大.证实了存在使碰撞界面发生绝热剪切失稳变形的临界速度,该速度与粒子沉积的临界速度一致.当粒子速度大于产生绝热剪切失稳变形的临界速度时,粒子的变形扁平率显著增加,且界面温度与有效接触界面面积也显著增加;随碰撞前粒子温度的增加,碰撞界面的温度也显著增加.高达粒子材料熔点的界面温度与有效接触面积的显著增加,将有助于粒子与基体之间冶金结合的形成.
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