快冷Fe71Al29合金中的两个内耗峰

用一个计算机控制的倒扭摆研究了快冷Fe71Al29合金中的两个内耗峰.在快冷的Fe71Al29样品中分别在180℃(P1)，340 ℃(P2)和510℃(P3)出现了内耗峰，而在慢冷的Fe71Al29样品中只发现了P3峰.快冷样品中的P1和P2峰在从650℃冷却下来的测量过程中或在350℃经过较长时间的时效后消失，其峰高随时效时间的增加 而下降，直至消失.P1和P2峰都有弛豫特征，它们的激活能分别为：H1=1．03±0．08eV(P1峰)；H2=1．64±0．05eV(P2峰).P1峰被认为是无序合金中Al原子在四面体点阵内的最近邻运动所引起，P2峰则是无序合金中Al原子在四面体点阵内的次近邻运动所引起. 关键词： Fe-Al合金 内耗

The two internal friction peaks in rapidly cooled Fe71 Al29 alloy

Three internal friction peaks were found around 180℃ (termed as P1),340℃ (termed as P2) and 510℃(termed as P3) in rapidly cooled Fe71Al29 alloy,while only the　P3 peak can be observed in slowly cooled sp ecimens.Only the P1 and P2 peaks were investigated using a computer- controlled inverted torsion pendulum in the present study.The P1 and P2 peaks in air-cooled specimens disappear during cooling or after long term ag eing at 350℃.They decline even disappear with increasing ageing time.Both the P1 and P2 peaks have relaxation features and their activation energy values are H1=1．03±0．08eVfor the P1 peak and H2=1．64±0．05eV for the P2 peak.It is suggested that P1 peak originates from the nearest neighbor jumps of Al atoms within tetrahedral lattices and P2 peak from the next-nearest-neighbor jumps of Al atoms within tetrahedral lattices in quenched alloys.