We systematically investigate the internal friction properties of a Fe–(43 at.%)Al powder mixture compact during the heating process with the expectation to understand the phase formation and transition process. Three internal friction peaks are successively observed during the heating process from room temperature to 750°C, but almost completely disappear in the subsequent cooling process. Three internal friction peaks exhibit obvious measuring frequency dependence, which increases with decreasing the frequency. The first internal friction peak originates from the micro-sliding of weak bonding interface between Al particles corresponding to a recrystallization process of deformed Al particles. The second internal friction peak is attributed to a phase formation process associated with the formation of the intermediate phase Fe2Al5. The third internal friction peak is considered to result from the formation of the FeAl intermetallic compound owing to the reaction of Fe2Al5 and residual Fe initiated by a dramatic thermal explosion reaction.

中文翻译：

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加热过程中铁铝相形成的内摩擦研究

我们系统地研究了加热过程中 Fe-(43 at.%) Al 粉末混合物压块的内摩擦性能，以期了解相形成和转变过程。在从室温到 750°C 的加热过程中连续观察到三个内摩擦峰，但在随后的冷却过程中几乎完全消失。三个内摩擦峰表现出明显的测量频率依赖性，随着频率的降低而增加。第一个内摩擦峰源于铝颗粒之间弱结合界面的微滑动，对应于变形铝颗粒的再结晶过程。第二个内摩擦峰归因于与中间相 Fe2Al5 形成相关的相形成过程。