固液复合成形铝镁双金属件平直界面的精确控制

Precise control on flat and straight interface for aluminum-magnesium bimetal component in solid-liquid composite forming

提出了固液复合成形制造平直界面铝镁双金属构件的方法,即采用室温固态镁合金和铝合金熔体作为初始坯料,通过整体模锻使铝合金熔体充型并包覆镁合金坯料。研究了成形压力为250、300、350和400 MPa,铝合金熔体温度为660、710、760和810℃时构件的成形质量和界面平直度。结果表明:增大压力和升高铝合金熔体温度可提高铝合金熔体的流动性,进而提高成形质量和界面平直度;但压力过大或温度过高时,镁合金易发生塑性变形,造成界面弯曲。当成形压力为350 MPa、铝合金熔体温度为710℃时,获得了平直而稳定的机械-冶金结合界面,实现了铝镁双金属构件平直界面的精确控制,并通过后续切削加工获得了具有完整平直界面的铝镁双金属构件。

A method of solid-liquid composite forming to manufacture Al/Mg bimetal component with flat and straight interface was proposed,namely,solid Mg alloy at room temperature and Al alloy melt were used as initial blanks,and the Al alloy melt filled the cavity and covered the Mg alloy blank through integral die forging.Then,the forming quality and interface flatness of components under the forming pressures of 250,300,350 and 400 MPa as well as the temperatures of 660,710,760 and 810℃of Al alloy melt were studied respectively.The results show that increasing the forming pressure and the temperature of Al alloy melt improves the fluidity of Al alloy melt,the forming quality and the interface flatness,but when the pressure or the temperature is too high,Mg alloy is prone to plastic deformation causing the interface to bend.As the forming pressure and the temperature of Al alloy melt were 350 MPa and 710℃respectively,a flat and stable mechanical-metallurgical bonding interface is obtained to realize the precise control of the flat and straight interface for Al/Mg bimetal component,and the Al/Mg bimetal component with the flat and straight interface is obtained through the subsequent cutting process.