【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。这些差别归因于两种样品中Ｔｉ原子在非晶相与α—Ｆｅ相中分配的不同更多还原

【Abstract】 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.更多还原