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在ZL102铝硅合金中分别加入3%Cu、11%Zn以及同时加入3%Cu和11%Zn后进行了挤压铸造工艺试验,并对其力学性能、显微组织、断口形貌进行了对比分析研究。结果发现,Al7Si3Cu合金的最佳工艺方案为:模具预热温度200℃,浇注温度700℃,压力140 kN,保压时间12 s;Al7Si11Zn合金的最佳工艺方案为:模具预热温度200℃,浇注温度680℃,压力100 kN,保压时间10 s;Al7Si11Zn3Cu合金的最佳工艺方案为:模具预热温度200℃,浇注温度700℃,压力140 kN,保压时间12 s。试验结果表明,向Al7Si3Cu合金中加入11%的Zn,使其抗拉强度提高了14.7%,硬度提高了35.6%;Al7Si11Zn合金中加入3%的Cu,虽然硬度提高了11.6%,但是抗拉强度下降了20.2%;Al7Si11Zn合金比Al7Si3Cu合金的平均抗拉强度高44.5%,平均硬度高21.5%。
ZL102 Al-Si alloy were added 3% Cu, 11% Zn and at the same time adding 3% Cu and 11% Zn after squeeze casting process test, and its mechanical properties, microstructure, fracture morphology were compared Analysis. The results show that the optimum technological process of Al7Si3Cu alloy is as follows: preheating temperature of mold is 200 ℃, pouring temperature is 700 ℃, pressure is 140 kN, holding time is 12 s. The optimum technological process of Al7Si11Zn alloy is as follows: preheating temperature of mold is 200 ℃, Pouring temperature is 680 ℃, pressure is 100 kN and dwell time is 10 s. The optimum technological process of Al7Si11Zn3Cu alloy is: mold preheating temperature is 200 ℃, pouring temperature is 700 ℃, pressure is 140 kN, dwell time is 12 s. The results show that adding 11% Zn to Al7Si3Cu alloy increases the tensile strength by 14.7% and the hardness by 35.6%, while adding 3% Cu to Al7Si11Zn alloy increases the hardness by 11.6%, but the tensile strength Decreased by 20.2%. The average tensile strength of Al7Si11Zn alloy was 44.5% and the average hardness was 21.5% higher than that of Al7Si11Cu alloy.