...fracture surface; dimple fracture; brittle fracture; expendable pattern shell [gap=18797]关键词：A356；微观组织；拉伸性能；断口表面；韧窝断裂；脆性断裂；消失模壳型铸造 ...
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计算表明， 断口表面层绝热升温温度依然高于液相线温度。
The adiabatic heating induces the temperature of fracture surface layer to be higher than the liquidus temperature too.
当裂纹扩展至拉伸过载区，断口表面则呈现明显的冲击断裂特征。
The fatigue fracture surface exhibits obviously impact facture characterization, when the crack propagates into overload tensile zone.
较高的疲劳性能与裂纹尖端闭合应力、断口表面粗糙度以及裂纹扩展路径弯折程度有关。
The high fatigue properties were found to be related with higher crack closure stress, rough fracture surface and tortuousity of crack path.
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