2009•Rejiagong gongyiRequires access

Microstructure and Mechanical Properties of New Type of Mg-Li-Al-Mn Alloy

Hongbin Li

Abstract

The effects of Mn on microstructure and properties of Mg-9Li-1Al alloy were studied. Adding Mn (from 0.2wt% to 0.5wt%) in to the alloy can refine grains. Mn addition can improve mechanical properties of the alloy at room temperature. Uniaxial tensile tests are carried out at room temperature. The tensile strength and yield strength of the alloy with 0.5wt% Mn may increase by 31.3% and 22.4% , respectively. Both the strength and the elongation decrease with Mn content rising. It is clarified that adsorption of Mn on the grain boundary makes grains refine and improves the tensile properties of the sheets, but the production of lots of MgMn2O4 and Li0.5MnO2 particles worsen the properties of the alloy.

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Key concepts: Alloy, Microstructure, Materials science, Ultimate tensile strength, Elongation, Metallurgy, 6063 aluminium alloy, Grain boundary