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首页> 外文期刊>Philosophical Magazine Letters >Changes in microstructure near the R-phase transformation in Ti_(50)Ni_(48)Fe_2 studied by in-situ electron microscopy
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Changes in microstructure near the R-phase transformation in Ti_(50)Ni_(48)Fe_2 studied by in-situ electron microscopy

机译：原位电子显微镜研究Ti_（50）Ni_（48）Fe_2中R相转变附近的组织变化

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摘要

Microstructural changes associated with the martensitic transformation from cubic (parent phase) to trigonal (R phase) which occurs with decreasing temperature in Ti_(50)Ni_(48)Fe_2 have been intensively studied by in-situ electron microscopy. Although the parent phase shows a characteristic microstructure with small domains, which are due to lattice modulation as a precursor to the transformation, their temperature dependence is contrasted with that of domains which appear below the transformation temperature in the R phase. The observations convince us that there is an essential difference between the natures of the domains observed in each state, and also reveal the formation of peculiar antiphase-like boundaries within a needle-like variant of the R phase. We also estimate the approximate size of the R phase just after nucleation and compare this with a theoretical consideration of the size of nuclei in martensites.
机译：Ti_（50）Ni_（48）Fe_2随着温度的降低，发生了与马氏体从立方相（母相）到三角相（R相）的马氏体转变有关的微观结构变化。尽管母相显示出具有小畴的特征微结构，这是由于晶格调制作为转变的前兆所致，但它们的温度依赖性与R相中出现在转变温度以下的畴的温度依赖性相反。这些观察结果使我们相信，在每种状态下观察到的域的性质之间都存在本质区别，并且还揭示了在R相的针状变体中形成了奇特的反相样边界。我们还估计刚成核后R相的近似大小，并将其与马氏体中核大小的理论考虑进行比较。

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