Effect of Trace Mn on Microstructure and Mechanical Properties of Al-7%Mg Alloy Ingots
Author of the article:LI Shengfeng;LI Jilin;NONG Deng;SUN Xiaoyan;LU Jianning;LIU Mingyang
Author's Workplace：Institute of Material and Forming Technology of Guangdong Province, Guangzhou 510651, China
Key Words：Mn content Al-7%Mg alloy fluidity mechanical properties microstructure
Abstract：
The effects of trace Mn on the as-cast microstructure, fluidity and mechanical properties of Al-7%Mg alloy were investigated by means of optical microscopy (OM), fluidity and mechanical properties test. The results show that the addition of trace Mn has no obvious grain refining effect on Al-7%Mg alloy;but, it is beneficial to improve the mechanical properties of the alloy. With the increase of Mn content, the fluidity of Al-7%Mg alloy increases first and then decreases. When 0.15% Mn is added, the unidirectional popularity of the alloy is the best, and the average flow length reaches 900 mm. When the Mn content fluctuated within 0.05%~0.25%, the tensile strength, yield strength and elongation of the alloy increased significantly with the increase of Mn. When adding 0.25% Mn, they were 299 MPa, 151 MPa and 12.6% respectively.
