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TEM Analysis of Long-Period Superstructures in TiAl Single Crystal with Composition Gradient

机译:成分梯度TiAl单晶的长周期超微结构的TEM分析

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The ordering mechanism of long-period superstructures (LPSs) in Al-rich Ti-Al alloys was studied using a TiAl single crystal with a composition gradient. A TiAl single crystal with gradient compositions from 55 to 75 at.% Al was prepared by annealing in a molten Al at 1234℃. The single crystal exhibits long-period ordering into different LPSs depending on the Al concentration as follows: an Al_5Ti_3 type short-range order, h-Al_2Ti and one-dimensional antiphase domain structures. These LPSs show an orientation relationship in which Al (002) layers of the LPSs are parallel to those of the TiAl matrix. The atomic arrangements of the LPSs are characterized in common as the alternate stacking of the Al (002) layers and Ti-Al (002) layers. It is thus concluded that the ordering of this type of LPSs and the phase transition between these LPSs are explained as structural changes in Ti-Al (002) layers of the Al-rich L1_0-TiAl crystal.
机译:利用具有梯度成分的TiAl单晶研究了富铝Ti-Al合金中长周期超晶格(LPS)的有序机制。通过在1234℃下在熔融的Al中退火来制备具有55至75at。%的Al的梯度组成的TiAl单晶。根据Al的浓度,单晶表现出长周期有序化为不同的LPS,如下所示:Al_5Ti_3型短程有序,h-Al_2Ti和一维反相畴结构。这些LPS显示了取向关系,其中LPS的Al(002)层与TiAl基体的Al(002)层平行。 LPS的原子排列的共同特征是Al(002)层和Ti-Al(002)层的交替堆叠。因此可以得出结论,这种类型的LPS的排序以及这些LPS之间的相变被解释为富Al的L1_0-TiAl晶体的Ti-Al(002)层的结构变化。

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