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通过定向凝固Ａｌ－Ｃｕ合金和Ｒｅｎｅｌ２５合金热裂纹的电子扫描显微分析，发现了热裂纹中晶间搭桥的存在，以及裂纹断面晶间搭桥破断留下的痕迹。并根据合金凝固过程的理论分析，对热裂纹的形成过程进行了合理的推测
Through the scanning electron microscopy analysis of the hot crack of Al-Cu alloy and Renel25 alloy, the existence of intergranular bridging in the hot crack and the traces left by the bridging between the intergranular cracks were found. Based on the theoretical analysis of the solidification process of the alloy, the formation of the hot crack is reasonably inferred