Alloy Elements Optimization of High Strength Al alloy Plate for Automobile

The extruded 5754 aluminum alloy high strength plate specimens for automobile with various contents of alloying elements vanadium and strontium had been used to carry out tensile and thermal fatigue tests.The results show that vanadium and strontium additions could improve the tensile properties and thermal fatigue property of the plates.The optimized content of alloying elements vanadium and strontium was 0.6% and 0.4%,respectively. Compared with the plate without vanadium,the tensile strength and yield strength of the plate with vanadium of 0.6% increased by 16% and 43%,and the average width and length of main crack decreased by 36% and 35%,respectively.Compared with the plate containing vanadium without strontium,the tensile strength and yield strength of the plate with strontium of 0.4% increased by 8%and 17%,and the average width and length of main crack decreased by 73% and 65%,respectively.