Fe-Cr-C纳米晶机械合金化的相变研究

Research on Phase Transformation of Nano-crystalline Fe-Cr-C Prepared by Mechanical Alloying

用X射线衍射仪、透射电子显微镜及穆斯堡尔谱仪分析了 Fe Cr C混合粉末经不同球磨时间机械合金化的相变趋势,以及不同含 C、Cr量对相变趋势的影响。研究表明,球磨时间及 C、Cr含量对机械合金化过程中相变趋势有重要影响。对Fe 13%Cr 8%C粉,球磨10 h,形成过饱和固溶体;球磨 20 h,有以(Fe,Cr)3C型碳化物为主的新相生成。当Cr=13%、C<5.7%时,球磨20 h,无新相析出,粉末原子一直处于扩散固溶状态;当C=5.7%、Cr>30%时,亦无新相析出,粉末逐步向非晶态转变。

The phase transformation tendency with different ball milling time and different C、Cr content was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and( M(o¨))ssbauer spectroscopy. The results show that the milling time and C、Cr content play an important role in the phase transformation tendency during mechanical alloying. For Fe-13%Cr-8%C powder, supersaturated solid solution formed after 10h of milling, while after 20h of milling, the main new phase (Fe,Cr)_3C carbide appeared. In addition, for powders with Cr=13%、C<5.7%, there is no new phase founds and almost all atoms in diffusion and solid solution during milling. On the other hand, there also is no new phase appeareds and the state of crystal changed to amorphous for C=5.7%、 Cr>30% powders.