Cr/Al复合合金化Fe_3Si基有序合金及其有序度研究

Fe_3Si Based Ordered Alloyed by Cr/Al and Their Degree of Ordering

基于合金化的改性原理,以调整材料的长程有序度为改性思想,采用真空电弧熔炼/热压退火制备了四种Cr/Al复合合金化Fe3Si基有序合金。通过XRD,SEM,EPMA等对合金进行了表征,并采用长程有序参数定量表征了退火得到的有序相的有序程度。结果表明:四种不同成分的有序合金,具有不同的显微组织。随着Si含量降低合金有序度下降,且Cr/Al的复合效应对这一趋势起到了促进作用,使得具有相同Si含量的Fe65Si25Cr5Al5有序合金的有序度低于Fe3Si,分别为0.658和0.796。

Based on the modification principle and adjustment of materials order degree,four kinds of Fe3Si based ordered alloys alloyed with Cr and Al were prepared by vacuum arc melting and annealing.Meanwhile,the alloys were characterized by XRD,SEM,EPMA,and the degree of ordering of the ordered phase was evaluated by the long range order（LRO） parameter.The result shows that four kinds of ordered intermetallics have different microstructure.With the decrease of Si content,the degree of order decreases.The effect of Al and Cr alloying plays a promoting roles in the decreasing tendency of degree of order.At the same content of Si,the order degree of Fe65Si25Cr5Al5 is lower than that of Fe3Si.The order degrees of Fe65Si25Cr5Al5 and Fe3Si are 0.658 and 0.796 respectively.