The fracture surface appeared intergranularcrack, due to the oxide formed during tensile test.
拉伸过程中形成的氧化物夹杂成为裂纹源，断口表现为沿晶断裂。
2
The oxidation degree of grain boundaries and crack propagation are qualitatively analyzed based on crack density and percentage of intergranularcrack.
用裂纹密度和晶界裂纹的比例对晶界氧化的程度及裂纹扩展情况定性地加以分析。
3
The results show that the precipitates on the grain boundaries and precipitate free zone (PFZ) were the main factor to enhance the intergranularcrack of the alloy.