The results show a certain time thermal cycle can cause the fracture mechanism change.It varies from original pure shear fracture to microvoid coalescence fracture gradually.

• 结果表明,一定时间的热循环会造成LF6铝合金焊接接头断裂机理的改变,由未经热循环时的纯剪切型断裂,逐渐过渡成微孔聚集型断裂。