Abstract: Large volume fraction of tensile twins were preset in ZK60 magnesium alloy sheet by corrugated wide limit alignment. The effects of deformation path along RD (rolling direction) and TD (transverse direction) at 200 ℃ on the microstructure and mechanical properties of the sheet were studied. The results show that the microstructure and properties of the ZK60 magnesium alloy sheet are different under different deformation paths. When deformed along RD direction, the volume fraction of tensile twins is higher than that deformed along the TD direction. When the tensile test is carried out along the RD direction, the yield strength of the sample deformed along the RD direction decreases and the tensile strength increases, while the yield strength of the sample deformed along the TD direction increases significantly and the tensile strength increases slightly. When the tensile test is carried out along the TD direction, all the yield strength and tensile strength of the sample deformed along the RD and TD direction increase. After the corrugated wide limit alignment, the strain-hardening exponent (n value) increases and the plastic strain ratio (r value) decreases significantly, which is beneficial to effectively improve the plastic forming performance of magnesium alloy sheet.

Key words: Mg alloy sheet, corrugated wide limit alignment, deformation path, mechanical properties