铝合金熔体泡沫化过程及多样化的泡沫铝合金

为满足高技术对多样化高比强新型多组元泡沫铝合金的需求,研究了泡沫化过程如下规律：何种铝合金适合泡沫化制备又可获得高比强;泡沫铝合金凝固收缩的物理本质及其解决的新方法;球形孔泡沫铝合金形成规律;二次泡沫化形成泡沫铝合金异型件的规律及其控制.     

Additional force field in cooling process of cellular Al alloy

The foaming process of Al alloy is similar to that of Al, but there is a solid-liquid state zone in the solidification process of cellular Al alloy which does not exist in the case of Al. In the unidirectional solidification of cellular Al alloy, the proportion of the solid phase gradually reduces from the solid front to the liquid front. This will introduce a force and result in a serious quick shrinkage. By the mathematic and physical mode, the solidification of the cellular Al alloy is studied. The data measured by experiment are close to the result calculated by the mode. This kind of shrinkage can be solved by suitable cooling method in appropriate growth stage. The compressive strength of the cellular Al alloy made by this way is 40% higher than that of cellular Al.     

胞状铝合金凝固过程中固-液两相区的附加力场

铝合金在泡沫化过程中和纯铝有着相似性, 但在在凝固过程中具有纯铝所没有的固液两相区, 单向凝固过程中离固相面距离不同固相含量也不同, 因此会产生一个导致严重收缩现象的附加力场, 采用物理数学模型与实验相结合的方法, 研究了具有固-液两相区胞状铝合金凝固过程的规律, 理论与实验结果符合良好. 在合适的生长阶段采用各向同时冷却的方法则可以解决这种缺陷. 采用这种方法制备的胞状铝合金的压缩屈服应力比胞状纯铝高40%以上.