Research on High Temperature Pyroplastic Deformation Behavior of Cu-Mn-Al Alloy

The pyroplastic deformation behavior of Cu-Mn-Al alloy was investigated by high temperature tensile test and thermal simulation compression test.The results show that the alloy has good thermal stability below 350℃, the tensile strength reaches above 860 MPa, but the elongation is near to zero.Then, the strength begins to decrease and the elongation increases significantly after increasing to 400 ℃, and the ductile-brittle transition temperature of the material is about 365.84℃.In hot simulation compressive process, the "flutter" phenomenon occurs in the true stress-strain curves of the alloy at higher strain rate or lower temperature, the material softens significantly at lower strain rate (0.001 s^-1) and higher temperature(650 ℃).In the range of 500-600℃, the relationship between flow stress and strain rate of the alloy accords with the power exponential law.