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用相场法模拟了凝固过程中椭圆形钉扎颗粒对晶粒长大的影响,考虑了不同长短轴比下的椭圆形颗粒对单位面积内晶粒数目、晶粒平均半径、晶粒尺寸分布以及晶粒所占面积分数的影响。结果表明,长短轴之比越小(短轴越长),颗粒对晶粒的钉扎作用就越弱,晶粒数目会越少,晶粒所占的面积分数会越来越大,平均晶粒尺寸也会越来越大,晶粒尺寸分布会越来越不均匀,发生晶粒异常长大的几率就会越来越大。
The effects of elliptical pinning particles on the grain growth during solidification were simulated by phase-field method. The influence of the elliptical particles with different length to short axis ratio on the number of grains per unit area, the average grain radius and the grain size distribution As well as the influence of grain area fraction. The results show that the smaller the ratio of the major axis to the minor axis (the longer the minor axis), the weaker the pinning effect of the particles on the grains, the smaller the number of the grains and the larger the area fraction of the grains, and the average grain The grain size will be bigger and bigger, the grain size distribution will be more and more uneven, the probability of abnormal grain growth will be bigger and bigger.