Dynamic cracking behaviors of weld solidification cracks for aluminum alloys at elevated temperature

The solidification microstructures of three Aluminum alloys of 5083,6082 and ZL101 were investigated and their dynamic cracking behaviors and the fracture features at elevated temperatures were observed and recorded.The results show that the metallurgical factors play a main role on the dynamic cracking behaviors of weld solidification cracks,that is to say,the dynamic cracking models of different alloys are different with their metallurgical characteristics.Therefore the dynamic cracking models can be classified into three types,one with healing effect such as ZL101,one with deformation and breaking down of metal bridge,like 5083 and another with the separation of liquid film along grain boundary such as 6082.