FORMATION OF DISORDERED STRUCTURES IN CR-FE ALLOY BY MECHANICAL MILLING

Mechanical milling was performed on the alloy Cr72Fe28. X-ray diffract ion and Mossbauer spectroscopy were used to follow the progress of the structural variation. The experimental results can be interpreted by assuming that the milled powders are composed of a small amount of cry stalline component and two disordered components: one with a random de nsely packed structure and the other with a random loosely packed stru cture. Moreover, differential scanning calorimetry was used to obtain the crystallization temperature. A mechanism was proposed to describe the formation of the disordered structures as well as the structural s tability in this alloy.