The tensile performance and the fracture toughness of 7B04 aluminium alloy have been determined, and the fracture of tensilesample is scanned.
通过比较不同时效工艺制度的性能指标和断口形貌，总结出时效制度对7B04铝合金断裂韧度的影响规律。
2
Hardness, tensile strength, breaking elongation ratio and aging property of samples were tested and surface of sample after aging was represented by SEM.
对试样进行了硬度、拉伸强度、断裂伸长率、热老化等性能试验；对老化后的试样表面进行了SEM表征。
3
Tensile test shall be carried out on one pipe sample representing each inspection lot. But not less than one pipe sample representing each heat test.