Microstructure and Mechanical Properties of Mg-Li-Mn Alloy

Mg-Li-Mn alloy is produced and rolled to thin sheet at room temperature in the present work. Adding Mn from 0.5% to 2% to the alloy can refine the crystalline grains. The resulting microstructure of alloy consists of α-Mg,β-Li and new Mn-rich phase. Uniaxial tension tests are carried out at room temperature. The prepared sheets have good tensile strengthen and yield strength. They can be raised by 16% and 17%,respectively,with Mn content increasing from 1% to 2%. It is observed that the existence of Mn on the grain boundary makes the grains refined,and hard particles of MgMn2O4 and Li0.5MnO2 forming in the alloy improves its mechanical properties.