对室温和低温对欠时效态3 J 21合金拉伸性能的影响进行了讨论。
The influence of temperature on the tensile properties of the under-aged 3j21 alloy was discussed.
结果表明：欠时效态3 J 21合金的室温断口为韧窝断口，而低温断口呈现混合断裂特征。
It was found that the room-temperature fracture of the under-aged 3j21 alloy was of a dimple, while the low-temperature fracture assumed a mixed rupture feature.
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