论文部分内容阅读
对Fe-24Mn,Fe-24Mn-6Si成分的粉末混合物进行了机械球磨,并对不同时间的球磨样品进行了X射线衍射(XRD)和Mo¨sbauer谱测量。结果表明,球磨使得Fe、Mn、Si在原子尺度上发生了混合,形成了顺磁性、面心立方结构的Fe-24Mn或Fe-24Mn-6Si纳米晶合金,这是Fe、Mn或Si原子由颗粒表面到体内扩散的结果。球磨67h以后结构未发生变化,表明形成的是一种热力学亚稳结构,这个结果与Fe-Mn和Fe-Mn-Si合金在室温下的相图结构明显不同。
The powder mixtures of Fe-24Mn and Fe-24Mn-6Si were ball-milled by mechanical milling, and X-ray diffraction (XRD) and Mo¨sbauer spectrum measurements of ball milled samples at different time were carried out. The results show that Fe, Mn and Si atoms are mixed at the atomic scale by ball milling to form a paramagnetic, face-centered cubic Fe-24Mn or Fe-24Mn-6Si nanocrystalline alloy with Fe, Mn or Si atoms consisting of The result of particle surface diffusion into the body. After milling for 67h, the structure did not change, indicating that a thermodynamic metastable structure was formed. This result is obviously different from the phase diagram of Fe-Mn and Fe-Mn-Si alloys at room temperature.