【摘要】 本文用金相显微和扫描电镜诊断技术,对序列尖峰脉冲准连续激光束照射LY12CZ和LF6M铝合金板材,产生激光热熔融与激光热应力效应,使照射区板材引生激光烧蚀熔池和许多断裂裂纹,造成材料断裂破坏的机理,进行了研究。给出了激光热应力、裂纹扩展应力与照射激光强度的变化关系和研究结果。更多还原

【Abstract】 By use of the metalloscopy and scanning electron microscopy,we have studied the fracture mechanism of aluminum-alloys(LY12CZ and LF6M) plates when irradiated by a quasi-continuous laser beam with series of sharp pulses. Melt pool formed in the laser radiation region, and many cracks appeared,due to the laser induced thermal stress. The relationships of the thermal stress and crack spreading stress with the incident laser intensity were obtained by this investigation.更多还原