利用内耗方法对空冷B2 Fe-Al合金中原子缺陷的运动特征进行了研究.在210℃(称为P1峰)和410℃(称为P2峰)附近观察到两个与样品热空位浓度密切相关的弛豫型内耗峰.研究表明,P1峰产生于应力作用下双空位(V_(Fe)V_(Al))的重新取向,而P2峰起源于反位置原子与Fe空位之间的相互作用.对于富Fe的B2 Fe-Al合金,P2峰产生于应力作用下三倍体缺陷(2V_(Fe)Fe_(Al))的重新取向;而对于富Al的B2 Fe-Al合金,P2峰则产生于应力诱导下Al反位置原子在Fe空位之间的运动.
The internal friction behaviors of air-cooled B2 Fe-A1 alloys were examined to understand the movement of atomic defects. Two internal friction peaks were found at around 210℃ (P1 peak) and 410℃ (P2 peak), respectively. Both the peaks showed relaxational nature and they are correlated to the concentration of vacancies. It is suggested that the P1 peak originates from the reorientation of the divacancies (V_(Fe)V_(Al)), the P2 peak from the interactions between antisite atoms and Fe vacancies. For the Fe-rich B2 Fe-Al alloys, the P2 peak is attributed to the reorientation of the triple defects (2V_(Fe)Fe_(Al)) ; for the Al-rich alloys, however, it is caused by the stress-induced migration of Al antisite atoms among the Fe vacancies.
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