The aging behavior, dislocation array and mechanical properties of a 2091 alloy aging at low temperature ( 80 ℃) have been studied by using TEM 、 DSC AND Instron tensile testing machine. 本文用透射电镜、示差扫描热分析和Instron电子拉伸机研究2091合金在低温(80℃)时效过程中的析出行为、位错组态及机械性能变化。