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利用原位拉伸扫描电镜,观察并研究了3104铝合金冷轧板动态拉伸过程中裂纹萌生和裂纹扩展情况,讨论了裂纹萌生和扩展与板材微观组织之间的关系。结果表明:在拉伸过程中,裂纹起源于滑移带处,并沿滑移带扩展。裂纹扩展路径受拉伸应力状态以及板材内部晶粒和粗大第二相分布的影响。原位拉伸断裂模式为韧窝断裂和剪切断裂复合断裂模式,断口形貌受裂纹扩展应力状态的影响。
In-situ tensile scanning electron microscopy (SEM) was used to observe and study crack initiation and crack propagation in 3104 aluminum alloy cold-rolled sheet during dynamic drawing. The relationship between crack initiation and propagation and the microstructure of the sheet was discussed. The results show that during the stretching process, the crack originates at the slip band and propagates along the slip band. The crack propagation path is affected by the tensile stress state and the distribution of grain and coarse second phase in the sheet. In-situ tensile fracture mode is dimple-fracture and shear-fracture complex fracture mode, and the fracture morphology is affected by the crack propagation stress state.