Microstructure and Properties of New Automobile Magnesium Alloy Modified by Vanadium and Titanium

In order to optimize the quality and properties of Mg-8Al-0.6Zn alloy for automobile,vanadium-titanium modification of Mg-8Al-0.6Zn-xV-0.5Ti(x=0,0.1,0.5,0.8) specimens was carried out,and the microstructure and mechanical properties of specimens with different vanadium content were tested and analyzed.The results show that with the increase of vanadium addition,the average grain size of the alloy decreases gradually,and the structure becomes dense and uniform with the strength increasing gradually.At 0.8% of the vanadium content,the average grain size of the alloy is the smallest at 16 μm with the tensile strength and yield strength of the alloy reaching to maximum of 289 MPa and 243 MPa respectively,and the elongation after fracture is 8.7%.Therefore,proper addition of vanadium is beneficial to improve the comprehensive properties of Mg-8Al-0.6Zn-xV-0.5Ti alloy for automobile.