Abstract A disordered Fe-31.2Pd (at.%) alloy exhibits a weak first-order martensitic transformation (MT) from a face-centered cubic structure to a face-centered tetragonal structure. We employed a Dynamic Mechanical Analysis (DMA) to understand the transformation behavior. As the temperature decreases, the storage modulus E ′ decreases in the parent phase and increases in the martensite phase. The loss tangent (tan δ ) shows a slight increase when approaching M s (=225 K), suggesting the formation of movable interfaces even above M s . The value of tan δ is nearly proportional to (1 − c/a ) 2 below M s , meaning that highly mobile twinned interfaces are essential for internal friction below M s . The so-called transitory term of tan δ is negligibly small for the MT of this alloy.

中文翻译：

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铁钯合金中弱一级马氏体相变的动态力学分析

摘要 一种无序的 Fe-31.2Pd (at.%) 合金表现出从面心立方结构到面心四方结构的弱一级马氏体转变 (MT)。我们采用动态机械分析 (DMA) 来了解转换行为。随着温度的降低，母相的储能模量 E ' 降低，马氏体相的储能模量 E ' 增加。当接近 M s (=225 K) 时，损耗角正切 (tan δ ) 略有增加，表明即使在 M s 之上也形成了可移动界面。在 M s 之下，tan δ 的值几乎与 (1 − c/a ) 2 成正比，这意味着高度移动的孪晶界面对于低于 M s 的内摩擦是必不可少的。对于这种合金的 MT，所谓的 tan δ 过渡项小到可以忽略不计。