铝合金材料LY12CZ临界空穴扩张比的适用性探讨

The Applicable Study for The Critical Void Growth Parameter(V_(GC) ) of Aluminium Alloy LY12CZ

对光滑试样和 3种不同曲率半径的切口试样 ,采用拉伸试验和电镜观测相结合的方法 ,研究了铝合金材料LY12CZ的VGC 参数的适用性。证实VGC 参数对材料的断裂形式较为敏感 ,适用于以拉伸型断裂为主的切口试样 ,对以剪切断裂为主的光滑拉伸试样不适用。

In this paper,the tensile smooth and notched specimens made of aluminium alloy LY12CZ were employed to study the applicable for the V GC of the material,both from the macro and micro points of view.It's found that the new ductile fracture parameter V GC is sensitive to the fracture morphology which is suitable for the case of tensile broken while not applicab1e for the case of the shear failure,i.e.the case of smooth tensile specimens.