Dynamic mechanical analysis of weak first-order martensitic transformation in an iron–palladium alloy
Dynamic mechanical analysis of weak first-order martensitic transformation in an iron–palladium alloy
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DOI：
10.1016/j.jallcom.2015.07.105
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发表时间：
2015-11
影响因子：
6.2
通讯作者：
F. Xiao;T. Fukuda;T. Kakeshita;M. Jin;X. Jin
中科院分区：
文献类型：
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作者：
F. Xiao;T. Fukuda;T. Kakeshita;M. Jin;X. Jin
无序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相变（MT）。我们采用了动态力学分析（DMA）来了解转变行为。随着温度的降低，母相的储能模量E ′减小，马氏体相的储能模量E ′增大。损耗角正切（tanδ）在接近Ms（=225 K）时略有增加，表明在Ms以上仍有可动界面形成。tanδ的值几乎与M以下的（1 −c/a）2成正比，这意味着高度移动的孪晶界面对于M以下的内摩擦是必不可少的。对于该合金的MT，所谓的tanδ的过渡项小得可以忽略。
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 modulusE′ decreases in the parent phase and increases in the martensite phase. The loss tangent (tanδ) shows a slight increase when approachingMs(=225 K), suggesting the formation of movable interfaces even aboveMs. The value of tanδis nearly proportional to (1 −c/a)2belowMs, meaning that highly mobile twinned interfaces are essential for internal friction belowMs. The so-called transitory term of tanδis negligibly small for the MT of this alloy.