"The traditional pre-deformation + aging treatment process can significantly improve the strength of magnesium alloys. Chinese researchers found that the process of aging treatment before torsional deformation can more effectively improve the performance of Mg-Al alloy. The tensile strength of the sample is from 157MPa Increased to 230MPa. Changed the traditional pre-deformation + aging strengthening method to provide more possibilities for subsequent research. ".
As the lightest metal structural material, magnesium alloys have broad prospects in the aerospace and automotive industries. In recent years, many studies have been devoted to improving its strength, ductility, fatigue and creep properties, so as to be suitable for a wider range of applications. The study found that pre-deformation + aging treatment can significantly improve the strength of magnesium alloy. This is mainly due to the introduction of a large number of twins in the pre-deformation stage, which can promote the continuous precipitation of the aging process.
Torsional deformation is a simple, effective, and low-cost gradient structure generation process. In recent years, a combination of torsional deformation and subsequent heat treatment has been used to improve the structural properties of magnesium alloys. The process of aging first and then torsional deformation has also been found to help strengthen the Mg alloy, but has a different microstructure mechanism. At this time, the main mechanism is that the deformation can reduce the dynamic recrystallization grain size and increase the content of precipitated particles, thereby playing a fine grain Strengthening and precipitation strengthening. However, the mechanism of the effect of aging after torsional deformation on the mechanical properties of magnesium alloys is not yet clear.
To this end, Xin Renlong team of Chongqing University and others used the process of aging treatment (SAT) before torsional deformation to study the structural properties of AZ91 alloy. The tensile strength of the sample was increased from 157MPa to 230MPa.