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采用差热分析及凝固组织研究Nd_9Fe_(85-x)Ti_4C_2B_x(x=10,12)合金熔体过热度对其过冷度以及凝固组织的影响。结果表明:Nd_9Fe_(85-x) Ti_4C_2B_x(x=10,12)合金的过冷度随熔体过热度的增大而显著增大,且每种合金均出现两个对应于平均过冷度急剧增大的临界过热度。两个平均过冷度转折点的存在与过热熔体中的结构转变有关,这最终导致凝固组织中非晶相体积分数的增加。
Differential thermal analysis and solidification microstructure were used to study the effects of melt superheat of Nd_9Fe_ (85-x) Ti_4C_2B_x (x = 10,12) alloy on its subcooling degree and solidification microstructure. The results show that the undercooling of Nd_9Fe_ (85-x) Ti_4C_2B_x (x = 10,12) alloy increases with the increase of the degree of superheating, and there are two peaks in each alloy corresponding to the average degree of undercooling Increased critical superheat. The existence of two mean subcooling junctions is related to the structural transformation in the overheated melt, which eventually leads to an increase in the volume fraction of amorphous phase in the solidified structure.