Microstructure And Properties Of Vacuum Die Casting Magnesium Alloy Shock Tower

2022-07-20 15:08

The microstructure and mechanical properties of the vacuum die-casting magnesium alloy shock tower were analyzed by OM, SEM and EDS. The casting simulation software EKKCapcast was used to simulate the filling process of die-casting, and the porosity in different positions of the shock tower was compared, and then the reasons for the entrainment of the casting were analyzed. The tensile test results show that when the high and low speed switching position of the punch changes between 560 and 600 mm, it has little effect on the mechanical properties of the shock tower. The reasons for the lower performance; and the simulations effectively predict where the entrainment may occur and the severity of entrainment. In recent years, with the rapid development of new energy vehicles, vehicle lightweighting has received increasing attention in the automotive industry. In order to control vehicle weight, reduce energy consumption and reduce exhaust pollution, more and more new materials are being used in the automotive industry. Magnesium alloy is the lightest metal structural material, about 35% lighter than aluminum alloy, about 78% lighter than steel, and also has the characteristics of good dimensional stability, high specific strength/specific stiffness, and easy processing. Al and RE are the main alloying elements in AE44 magnesium alloy. As the most commonly used alloying element in magnesium alloys, Al can improve its strength and castability. The atomic bonding force between RE and Al is greater than that of Mg and RE, so the Al11RE3 phase with high thermal stability will be preferentially combined, thereby reducing the Mg17Al12 phase with poor thermal stability, which is beneficial to the high temperature performance of magnesium alloys. The RE element can also improve the morphology of the Mg17Al12 phase and refine the grains, thereby improving the room temperature mechanical properties of the alloy. Moreover, due to the improved morphology and reduced content of the Mg17Al12 phase, the microcurrent density between the phase and the magnesium matrix is ​​reduced, which reduces microcurrent corrosion and improves the corrosion resistance of the alloy.

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