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根据金属凝固理论,建立了半固态镁合金流动性的计算模型,采用该模型预测了半固态AZ91D镁合金的充型能力。结果证实,预测结果与试验结果相吻合。通过流动性试验,对半固态AZ91D镁合金的充型能力进行了研究。结果表明,剪切后的半固态镁合金浆料的充型能力明显要比未经剪切的镁合金浆料的充型能力好。随着充型温度降低,剪切前后镁合金浆料充型长度增加值逐渐增大,而随着充型温度的继续降低,剪切前后的充型长度的增加值又逐渐降低。半固态镁合金在560~570℃时充型长度增加值最大。
According to the theory of metal solidification, a computational model of fluidity of semi-solid magnesium alloy was established. The model was used to predict the chargeability of semi-solid AZ91D magnesium alloy. The results confirm that the predicted results are consistent with the experimental results. Through the liquidity test, the filling ability of semi-solid AZ91D magnesium alloy was studied. The results show that the filling ability of the sheared semi-solid magnesium alloy slurry is obviously better than that of the non-sheared magnesium alloy slurry. With the decrease of filling temperature, the increase of filling length of magnesium alloy before and after shearing gradually increases. With the continuous decrease of filling temperature, the increasing of filling length before and after shearing decrease gradually. Semi-solid magnesium alloy at 560 ~ 570 ℃ when filling the maximum increase in length.