摘要
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。
The effectsof melt overheating degree on the undercooling degree and resultant solidification structures of Nd9Fe85-xTi4C2Bx(x=10, 12) glass-forming alloyswerestudied by differential thermal analysis combining with solidification structure analysis. The results indicate that the undercooling degree of Nd9Fe85-xTi4C2Bx(x=10, 12) alloys significantly increaseswith the rise of melt overheating degree, and two overheating degree thresholds corresponding to the drastic increase of the mean undercooling degree are found for each of the alloys. The existence of two turning points of the mean undercooling degreescan be linked to the structure transitions inside the overheated melts, which result in the evident increase of volume fraction of amorphous phasein the solidified structures.
基金
Projects(51174121,51274125)supported by the National Natural Science Foundation of China
Project(2010R50016-30)supported by Zhejiang Province Science and Technology Innovation Team of Key Projects,China
Project supported by the K.C.Wong Magna Fund of Ningbo University,China
关键词
磁性合金
熔体过热
过冷度
结构转变
非晶形成能力
magnetic alloy
melt overheating
undercoolingdegree
structure transition
glass formability