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电场下的凝固是控制金属凝固组织和制造具有特殊性能新型材料的一种新途径。研究交流电场对Al-Si共晶合金凝固组织的影响,以及对其力学性能的影响。通过试验分析Al-Si共晶合金Si的形貌、Si相间距、Si片的线长度、抗拉强度和硬度。试验结果表明:在Al-Si共晶合金凝固过程中施加交流电场,Al-Si共晶合金的凝固组织得到细化;共晶Si质点增加,共晶Si由原来的针片状演化成细小的针状,合金力学性能得到了改善;在通入适当数值的电流后Al-Si共晶合金能够获得最佳的抗拉强度和硬度。
Solidification under the electric field is a new way to control the metal solidification structure and manufacture new materials with special properties. The effect of AC electric field on the microstructure of Al-Si eutectic alloy and its mechanical properties were studied. The morphology, Si phase spacing, Si wire length, tensile strength and hardness of Al-Si eutectic alloy were analyzed through experiments. The experimental results show that the solidified microstructure of Al-Si eutectic alloy is refined by AC electric field during the solidification process of Al-Si eutectic alloy. The eutectic Si particles increase and the eutectic Si evolves from the original needle- Acicular, alloy mechanical properties have been improved; access to a suitable value of the current Al-Si eutectic alloy can get the best tensile strength and hardness.