Fe-Al合金有序化过程中的内耗峰

INTERNAL FRICTION PEAK IN B2 Fe-A1 ALLOYS DURING ORDERING PROCESS

利用内耗方法对B2 Fe-Al合金的有序化过程进行了研究,并分析了有序化过程与原子换位运动之间的关系.对于油冷Fe_(47)Al_(53)合金,在570℃左右观察到一个内耗峰;但是对于炉冷样品,该峰并不出现.这个内耗峰具有典型的相变峰特征,XRD和DSC显示,该峰的出现与样品的有序化过程有关,它产生于反位置原子通过最近邻的空位向自身亚晶格位置的跳动.油冷Fe_(57)Al_(43)合金中类似的峰出现在540℃附近.

The internal friction behaviors of B2 Fe Al alloys were examined to understand the correlation between the ordering process and the atomic movement. An internal friction peak was found at around 570 ℃ in the oil cooled Fe47Al53 alloy, while the peak in the furnace-cooled specimens disappeared. The peak has the typical phase transition character. Combined with analyses of XRD and DSC, it is proposed that the peak originates from the ordering process, which is caused by the jump of antisite atoms to their own sublattice sites through the nearest neighboring vacancies. Similar internal peak was observed also at 540 ℃ for Fe57Al43 alloy.