机械合金化Nd—11Fe-Ti合金和机械研磨 NdFe_(11)Ti化合物退火时的相转变  

PHASE TRANSFORMATION IN ANNEALED MECHANICAL ALLOYING Nd-11Fe-Ti ALLOY AND ANNEALED MECHANICAL MILLING NdFe(11)Ti COMPOUND

作　　者：唐少龙[1] 吴昌衡[2] 金希梅[2] 王博文[2] 庄育智[2] 

机构地区：[1]湘潭大学机械工程系,湘潭411105 [2]中国科学院金属研究所,沈阳110015

出　　处：《金属学报》2000年第1期21-24,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金!59471022

摘　　要：采用 Ｘ射线衍射、初始交流磁性率和差热分析研究了机械合金化 Ｎｄ－１１Ｆｅ－Ｔｉ（原子比）合金粉和机械研磨 ＮｄＦｅ_１１Ｔｉ比台物粉在退火过程中的相转变．球磨７ｈ后二者均由非晶相和Ｔｉ在α－Ｆｅ中过饱和固溶体组成。机械合金化粉末样品中的非晶相的晶化温度为 ６２０℃，晶化亚稳相为 ＴｂＣｕ_７，结构的 Ｎｄ（Ｆｅ；Ｔｉ）７， ９００℃以上退火时。亚稳相转变成 ＴｈＭｎ１２结构 Ｎｄ（Ｆｅ， Ｔｉ）１２相；机械研磨的ＮｄＦｅ１１Ｔｉ化合物树中非晶相在６３８℃晶化形成的Ｎｄ（Ｆｅ，Ｔｉ）７在１０００℃以上退火向Ｎｄ（Ｆｅ，Ｔｉ）_１２相转变。Phase transformation in annealed mechanical alloying Nd--11Fe-Ti alloy and annealed mechanical milling NdFe11Ti compound is investigated by using X--ray diffraction, ac initial susceptibility measurement and differential thermometric analysis. Both the as-milled samples consist of a mixture of an amorphous phase and a bcc solid solution of Ti in a--Fe. For mechanical alloying Nd--11Fe-Ti alloy the crystallized temperature of the amorphous phase is 620℃ and the alloy transforms into the TbCu7--type Nd(Fe, Ti)7 phase after crystallization. When the annealing temperature is 900℃, the ThMn12--type Nd(Fe, Ti)12 is readily formed. For mechanical milling NdFe11Ti compound the crystallized temperature is 638℃ and only when the annealing temperature is higher than 1000 ℃the Nd(Fe, Ti)7 phase begins to transform into the Nd(Fe, Ti)12 phase. These differences are attributed to the differences of Ti distribution in the amorphous and a--Fe phases.

关 键 词：机械合金化 机械研磨 Nd(Fe Ti)12相 相变 

分 类 号：TF12[冶金工程—粉末冶金] TG111.5[冶金工程—冶金物理化学]