Al含量对Fe-Al合金Zener弛豫的影响

在多功能内耗仪上用自由衰减和强迫振动方法研究了Al含量对退火态Fe-Al合金Zener弛豫的作用.结果显示：中等Al含量的Fe-Al合金产生强的Zener弛豫，而较低和较高Al含量的Fe-Al合金只产生微弱的Zener弛豫峰.Fe-Al合金中的Zener弛豫产生于次近邻Al原子对的重新取向以及它们之间的相互作用，而不是来源于最近邻的Al原子对，后者因为形成短程有序结构不能产生Zener弛豫. 关键词： Zener弛豫 Al含量

Influence of Al content on Zener relaxation in Fe-Al alloys

The effect of Al content on the Zener relaxation peak in annealed Fe-Al alloys has been investigated using a computer-controlled automatic inverted torsion pendulum through free-decay and forced vibration method. It has been shown that alloys with medium Al contents show strong relaxation while lower or higher Al content leads to relatively weak Zener relaxation peak. The relaxation in Fe-Al alloys originates from the next-nearest-neighbor atom-pairs and their interaction instead of the nearest-neighbor atom-pairs. The latter may not produce the Zener relaxation because of the ordered-structure formed, which suppresses Zener relaxation.