稀土元素对铝铜合金流动性的影响

采用同心三螺旋合金流动性测定仪和正交实验法研究了稀土La、Ce和温度对ZL205A合金流动性的影响规律,并通过断口形貌分析铝铜合金停止流动机理。研究表明,流动性随不同的浇注温度呈正相关的线性变化规律,且随着稀土元素La和Ce的加入ZL205A合金流动性明显提高。当熔炼温度为720℃,稀土Ce含量为0.1%、La含量为0.2%时ZL205A合金的流动长度为980 mm;稀土La和Ce的添加缩短了合金凝固区间,起到了异质形核作用,晶粒细小,提高了流动性。

Effect of Rare Earth on the Fluidity of Al-Cu Alloy

The influence of La, Ce and temperature on the fluidity of ZL205 A alloy was studied by concentric three-helix alloy fluidity tester and orthogonal experimental method. The flow stopping mechanism of Al-Cu alloy was analyzed by fracture morphology. The results show that the fluidity of ZL205 A alloy is positively correlated with casting temperature,and the fluidity of ZL205 A alloy is significantly increased with the addition of rare earth elements La and Ce. When the melting temperature is 720 ℃, rare earth Ce content is 0.1%, the La content is 0.2% when ZL205 A alloy flow length is980 mm;The addition of La and Ce shortens the solidification interval of the alloy, plays the role of heterogeneous nucleation, and improves the fluidity due to the fine grain size.