Effects of melt overheating degree on undercooling degree and amorphous forming of Nd_9Fe_(85-x)Ti_4C_2B_x(x=10, 12) magnetic alloys  

熔体过热度对Nd_9Fe_(85-x)Ti_4C_2B_x(x=10,12)磁性合金过冷度和非晶形成的影响（英文）

作　　者：杨梦琳[1] 潘晶[1] 刘新才[1] 肖晓燕[1] 詹玉勇 

机构地区：[1]宁波大学材料科学与化学工程学院,宁波315211

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第10期2633-2640,共8页中国有色金属学报（英文版）

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

摘　　要：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.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。

关 键 词：magnetic alloy melt overheating undercoolingdegree structure transition glass formability 

分 类 号：TG132.27[一般工业技术—材料科学与工程]