Effect of Change of Main Elements on Microstructure and Mechanical Properties of Al-8Mg-xSi Alloy
A series of compositions were designed on the basis of high magnesium aluminum alloy,and the effect of Si content on the microstructure and mechanical properties of Al-8Mg-xSi alloy was studied.The results show that with the increase of Si content,the grain boundary profile becomes clearer and the volume fraction of Mg2Si strengthening phase increases.When the content of Si is 2.6wt.%,the comprehensive mechanical properties of the alloy are the best,and the hardness,tensile strength and yield strength are 93.1,254.9MPa and 232.5MPa,respectively,which are 7.4,37.7MPa and 26MPa higher than those of the alloy with 1 wt.%Si.Among them,the fracture mechanism changes from mixed fracture to brittle fracture.
Al-Mg-Si alloyHigh Mg-added Al alloyMicrostructureMechanical properties