常规固溶态2024铝合金ECAP加工后的拉伸性能

Tensile Properties of the 2024Al Alloy Processed by Conventional Solid-Solution and Subsequent Equal-Channel Angular Pressing (ECAP)

在室温下对处于常规固溶处理态的2024高强铝合金成功实现了等效应变为0．5的等通道转角挤压(ECAP),将形变强化、时效强化和结构细化强化三者有机组合,制备出超高强铝合金,其硬度、屈服强度、伸长率分别高达1770 MPa,550 MPa和14％。研究结果首次证明,固溶处理+室温ECAP+时效是提升常规高强铝合金的强度、制取超高强铝合金的一条有效途径。

Equal-channel angular pressing （ECAP） of the 2024Al alloy treated by conventional solid solution has been successfully performed at room temperature with an imposed equivalent strain of -0.5. A considerably high hardness of-1770 MPa and a yield strength of-550 MPa in terms of commercial aluminum alloys were observed for the ECAPed alloy. In addition to the strengthening, this process allows the ECAPed alloy has a moderate level of tensile ductility （-14%）. It is believed that the ECAP-induced dislocation, fine-particle precipitation, and microstructural refinement and homogenization are responsible to the modification in tensile properties. It is concluded that a pre-ECAP solid solution plus post-ECAP naturally aging treatment is very effective in improving the hardness and strength of 2024 Al alloy.