Microstructure and properties of M g-Li-A lalloys with Mn addition

Abstract

Mg-xLi-Al alloys with Mn addition from 0.2% to 1.5% by wt. were produced and studied. The density of the alloys is very low , betw een 1.21 g/cm3 and 1.64 g/cm3, while the microstructures change from single α-,(α＋β)-,to single β-phase with lithium contentrising from 5% to 22% by wt.The m ain alloy studied w as LA 92 alloy with Mn addition. The results ofthe tensile tests show that the strength decreases with increasing lithium content, while the elongation increases sharply,and the U TS and Y S rise by 26.8% and 22.7% respectively,when 0.5% by wt. Mn is added.It is also known,by microstructure observation,SEM with EDS and X-ray analysis,that adding Mn can produce som e new hard phases in the alloy, which may worsen the tensile properties.

Keywords

• Mg-Li-A lalloy
• Mn
• microstructure
• tensile properties