论文部分内容阅读
制备一种含有Al4C3和Ti C颗粒团的Al-Ti-C中间合金,该合金对纯镁有很好的细化作用。当中间合金加入量为2%时,镁晶粒细化为(110±17)μm的等轴晶。通过分析可知,Al4C3和Ti C组成的颗粒团在细化过程中发挥了重要作用。与单个、光滑的形核颗粒相比,颗粒团上的凹面区域增加了熔体中的液态镁原子向稳定晶核转变的可能性,依附在颗粒团凹面区域尺寸较小的晶胚也可以满足临界形核半径的要求,这使得Al4C3和TiC颗粒团成为镁晶粒更理想的形核基底。
An Al-Ti-C master alloy containing Al4C3 and TiC particles is prepared, which has good refining effect on pure magnesium. When the addition amount of the master alloy is 2%, the grain refinement of magnesium is (110 ± 17) μm equiaxed. Through the analysis we can see, Al4C3 and TiC particle group in the refining process has played an important role. The concave areas on the pellet increase the likelihood that the liquid magnesium atoms in the melt will transition to a stable nucleus, as compared to a single, smooth nucleation particle, and embryoids that are attached to a smaller size in the concave area of the pellet may also satisfy Critical nucleation radius requirements, which makes Al4C3 and TiC particles into a more ideal magnesium crystal nucleation substrate.