Study on Microstructure and Casting Properties of ADC12-0.25Ti Aluminum Alloy for Automobile Parts

ADC12-0.25Ti aluminum alloy for automotive parts was prepared by different pouring temperatures, and the microstructure, fluidity and thermal cracking resistance of the samples were tested and analyzed.The results show that with the increase of pouring temperature from 690 ℃to 750℃, the microstructure of the alloy keeps unchanged at first and then coarsens rapidly, the fluidity increases gradually, and the hot cracking resistance increases first and then decreases. When the pouring temperature is 690 ℃, the flow length of the molten aluminum is the shortest; when the pouring temperature is 750 ℃, the flow length of the molten aluminum is the longest, which is 71 mm larger than that at 690 ℃.When the pouring temperature is 720 ℃, the crack length of the sample is the shortest, which decreases by 2.9 mm compared with that of pouring temperature at 690 ℃; when the pouring temperature is 750 ℃, the crack length of the sample is the longest, which increases by 3.4 mm compared with that of pouring temperature at 690℃.