固溶-大应变-后续热处理态AZ31镁合金的组织和性能

Microstructure and Properties of AZ31 Processed by Solid-Solution-Large

摘要:

以AZ31镁合金为试验对象，探索固溶-大应变-后续热处理工艺路线制备高强镁合金的可行性。研究表明：固溶-大应变(强烈压缩)可以大幅度提高镁合金的强度(屈服强度约330 MPa)；后续适当的时效可以进一步提高镁合金的强度(时效强化)，其屈服强度约为370 MPa；后续再结晶处理可以在保持固溶态合金强度的同时大幅度提高其塑性。大应变样品显微组织中存在着大量的孪晶(内有亚晶存在)和位错。研究结果发现固溶-大应变-后续热处理是制备高强高延性镁合金的有效途径

Abstract:

AZ31 magnesium alloy is used as a research object to explore whether the solid-solution, large strain deformation and post heat treatment can be used to prepare a high strength magnesium alloy. It is found that a yield strength of about 330 MPa can be got by the solid-solution and large strain deformation, and a yield strength of about 370 MPa can be got by the post appropriate aging due to aging strengthening. The plasticity can be enhanced by post recrystallization, keeping the strength of solid-solution state at the same time. Many twins and dislocations are found in the large strain deformation sample with a mean grain size of 1~3 μm. It can be concluded that the solid-solution, large strain deformation and post heat treatment technology is an a effective method to enhance the strength and ductility for aluminum alloys and magnesium alloys