钼硅混合粉末在机械合金化过程中的结构演变(英文)  

Structure Development during Mechanical Alloying of Mo and Si Powders

作　　者：马勤[1] 王翠霞[1] 薛群基[2] 

机构地区：[1]甘肃工业大学材料科学与工程学院,甘肃兰州730050 [2]中国科学院兰州化学物理研究所,甘肃兰州730000

出　　处：《稀有金属材料与工程》2003年第3期170-172,共3页Rare Metal Materials and Engineering

摘　　要：采用X射线衍射仪(XRD)和差热分析仪(DTA)研究了Mo-67at%Si元素混合粉末在中等强度的机械研磨(合金化)过程中的结构变化过程。结果表明:在中等强度的研磨过程中,β-MoSi2是初生相,且在随后的研磨过程中非晶化;在高研磨强度下生成α-MoSi2的量大于β-MoSi2,且α-MoSi2的含量随研磨时间的增加而增加。差热分析表明亚稳相β-MoSi2随着温度的升高会向α-MoSi2转变。In the article, the product formation of Mo-67 at % Si powders mixture during mechanical alloying (MA) under the condition of a middle ball milling energy was studied. The mechanically alloyed powders were characterized by X-ray diffraction (XRD) and differential thermal analysis (DTA). The change in XRD patterns of the blended powders of Mo and Si during milling shows that the hexagonal (beta-MoSi2) was the first phase formed under the present condition and the microcrystalline beta-MoSi2 was amorphizated in the further ball milling process. The formation of tetragonal alpha-MoSi2 required much higher milling energy compared to the formation of beta-MoSi2. The transformation of alpha-MoSi2 might take place in the milling process with the milling time increasing. DTA experiments indicated that metastable beta-MoSi2 phase can transformed into stable alpha-MoSi2 phase with the temperature raising.

关 键 词：钼硅混合粉末 机械合金化 结构演变 α-二硅化钼 β-二硅化钼 

分 类 号：TF124[冶金工程—粉末冶金]