中文摘要：

X 光检查断层摄影术被用来在高压力描绘孔死 AM60B 合金扔。在 situ，张力的变丑被执行观察裂缝开始，繁殖和标本的随后的骨折上的孔和他们的影响的变化。结果显示出孔的四种类型，包括煤气收缩的毛孔，煤气的毛孔，网收缩和岛收缩，能根据形成机制和形态学描述被识别。在张力的变丑期间，这被显示出煤气收缩的毛孔和网收缩，而非煤气的毛孔或岛收缩，是为快克的主要来源开始。另外，裂缝由与忍受区域的最小的有效力量在生气的节互连孔宣传了。在外部地团结的晶体(转换字符) 是在场的的地方，，在这些地点，裂缝将在一个内部小粒的模式沿着 ESC 边界宣传在没有转换字符的这些地点，裂缝将在 trans 小粒、内部小粒的模式的联合沿着对张力的压力垂直的方向粗略地宣传。

英文摘要：

X-ray tomography was used to characterize the porosity in high pressure die casting of AM60B alloy. In situ tensile deformation was performed to observe the change of porosities and their influences on crack initiation, propagation and subsequent fracture of specimen. Results showed that four types of porosi- ties, including gas-shrinkage pore, gas pore, net-shrinkage and island-shrinkage, could be identified according to the formation mechanism and morphology characterization. During tensile deformation, it was shown that the gas-shrinkage pore and net-shrinkage, rather than gas pore or island-shrinkage, were the main sources for crack initiation. In addition, the crack propagated by interconnecting the po- rosities at the cross section with minimum efficient force bearing area. At these locations where externally solidified crystals （ESCs） were present, the crack would propagate along the ESC boundaries in an inter- granular mode, while at these locations without ESCs, the crack would propagate roughly along the direction perpendicular to the tensile stress in a combination of trans-granular and inter-granular modes.