The effect of lanthanum addition on the grain refinement of CrMnFeCoNi high-entropy alloys (HEAs) was investigated experimentally. When 9.3 pct lanthanum was added, the equiaxed zone faction enlarged sharply from 41.17 to 76.58 pct. The number of grains < 200 µm increased obviously, and the mean grain size in the equiaxed zone decreased from 331 to 144 μm. Compositional undercooling induced by lanthanum addition caused grain refinement of the HEAs.

中文翻译：

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添加镧细化CrMnFeCoNi高熵合金铸锭的晶粒

实验研究了镧对CrMnFeCoNi高熵合金（HEAs）晶粒细化的影响。当添加9.3 pct镧时，等轴区​​派系从41.17 pct急剧扩大到76.58 pct。晶粒的数量<200 μ米明显增加，并在等轴晶区的平均粒径从331减少到144  μ米。镧添加引起的成分过冷导致了HEA的晶粒细化。