MOSi2机械球磨过程中的物相转变

利用ZJM10T型搅拌球磨机、X射线衍射仪研究MoSi2粉末在球磨过程中的固态相变行为。结果表明,随着球磨时间的延长,MoSi2粉末的衍射峰强度不断减弱、衍射峰逐渐宽化。当球磨强度较高,提供的能量达到相变所需的能量时,粉末发生t-MoSi2相向h-MoSi2相的转变,否则,粉末仅发生物理变化。随着球磨时间的增加,h-MoSi2相的量逐渐增加,继续球磨,MoSi2合金粉末呈非晶化。h-MoSi2相与t-MoSi2相在原子的堆垛顺序上有所不同,它可以在t-MoSi2晶体结构中原位形成。

Solid Phase Transformation of MoSi2 in Mechanical Milling Process

The solid phase transformation of MoSi2 in mechanical milling process are studied with ZJM10T miller and X-ray diffractometer( XRD). The results show that the intensity and width of diffraction peak of MoSi2 powder are continuously decreased and increased with the increase of the mechanical milling time, respectively. During the process of milling, the h -MoSi2 phase appears while the strength of milling is high enough, otherwise only the physical changes occur in MoSi2 powder. The amount of h -MoSi2 is gradually increased, and the MoSi2 powder will be transferred into non-crystalline structure with the continuously increasing of the grinding time. The stack sequence of h -MoSi2 is different from the t -MoSi2, and h -MoSi2 can be formed from the crystallite of t -MoSi2 in situation.