添加稀土元素的ADC12铝合金铸造性能研究

Study on Casting Properties of ADC12 Aluminum Alloy Added Rare Earth Elements

在ADC12铝合金中添加0.1wt%不同种类的稀土元素制备了新型铝合金铸态试样,并进行了流动性、自由线收缩、热裂倾向的测试与对比分析。结果表明:在ADC12铝合金中添加稀土元素有助于提高流动性、线收缩性能、抗热裂倾向性,改善合金的铸造性能。与添加La相比,在ADC12铝合金中添加Ce的流程长度增大186 mm,线收缩率减小0.22%,热裂应力减小37 kPa;添加Y的流程长度增大54 mm,线收缩率减小0.17%,热裂应力减小20k Pa。在添加量相同的前提下,稀土元素对ADC12铝合金铸造性能的改善效果:Ce>Y>La。

A new type of aluminum alloy as-cast sample was prepared by adding different rare earth elements with0.1wt% to ADC12 aluminum alloy. And the fluidity, free line shrinkage and hot cracking tendency were tested and compared.The results show that the addition of rare earth elements in ADC12 aluminum alloy is helpful to improve the fluidity, linear shrinkage, hot cracking resistance and castability of the alloy. Compared with that of La, the flow length of ADC12 aluminum alloy with Ce increases by 186 mm, the linear shrinkage decreases by 0.22% and the hot cracking stress decreases by 37 kPa;the flow length of ADC12 aluminum alloy with Y increases by 54 mm, the linear shrinkage decreases by 0.17% and the hot cracking stress decreases by 20 kPa. On the premise of the same addition amount, the improvement effect of rare earth elements on the casting properties of ADC12 aluminum alloy is Ce>Y>La.