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首页> 外文期刊>Philosophical Magazine Letters >Studies on the a -> y phase transformation mechanism in Ti-48at.% Al alloy by high-resolution electron microscopy
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Studies on the a -> y phase transformation mechanism in Ti-48at.% Al alloy by high-resolution electron microscopy

机译：高分辨率电子显微镜研究Ti-48at。％铝合金中a→y相变机理

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The a -> y phase transformation, which occurs during quenching and produces extremely fine o"2-y lamellae, is discussed in relation to the analysis of the a2-y interface structure. In a high-resolution image obtained from the growth edge of a y plate in the a2 matrix, steps that were always found to be (0002)a2 or (111)7 planes high were observed at the a2-y interface. This indicates that the a->y phase transformation is performed by the migration of (a/3) (1100)hcp Shockley partial dislocations on alternate (0001 )hCp planes to change the stacking sequence AB. to ABC- Chemical analysis by analytical transmission electron microscopy with energy-dispersive X-rays showed that the a2 and y plates have the same composition, so that the a->y phase transformation which occurred during quenching can be interpreted as being composition invariant when these results are taken into consideration, it is suggested that the transformation is martensitic.
机译：关于a2-y界面结构的分析，讨论了在淬火过程中发生的a→y相变，并产生极细的o“ 2-y薄片。在从a2-y界面的生长边缘获得的高分辨率图像中，在a2矩阵中的ay平板上，在a2-y界面上观察到的台阶通常被发现为（0002）a2或（111）7平面高，这表明a-> y相变是通过迁移A进行的。 （a / 3）（1100）hcp Shockley局部位错在交替（0001）hCp平面上的位错，以改变堆积顺序AB。转换为ABC-化学分析通过透射电子显微镜用能量色散X射线显示，a2和y板由于具有相同的组成，因此当将这些结果考虑在内时，淬火过程中发生的a-> y相变可以解释为组成不变，这表明该转变是马氏体的。

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