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On the formation mechanism of faulted dipolar loops in λ-TiAl

机译：λ-TiAl中有缺陷偶极环的形成机理

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Some new geometrical features of 1/6<112] faulted dipolar loops have been observed in a Ti-52 at. % Al alloy deformed at 77 K. It was observed that the 1/6<1-bar 1-bar 2] dipole could switch its alignment from <1-bar 01] to <0 1-bar 1] directions, and vice versa; also the loops in alignment along both <1 0-bar 1] and <0 1-bar 1] could be created by the same parent superdislocation along its line and, on further movement of the parent dislocation, the two loops could attach to one another at the meeting point. No extra dislocation debris or segments were created at either the turning point or the attachment site. These particular features have been discussed on the basis of the available models for the formation mechanism of the dipoles. It is predicted that the particular features can be created only under a favourable stress and no such features are expected for 1/3<211] faulted dipolar loops.
机译：在Ti-52 at处观察到1/6 <112]断层偶极环的一些新的几何特征。 ％铝合金在77 K时变形。观察到1/6 <1-bar 1-bar 2]偶极子可将其排列从<1-bar 01]转换为<0 1-bar 1]方向，反之亦然;同样，沿<1 0-bar 1]和<0 1-bar 1]对齐的循环也可以由同一父代超位错沿其线创建，并且在父位错进一步移动时，两个环可以连接到一个在集合点另一个。在转折点或附着位置均未产生额外的位错碎片或碎片。这些特定特征已经在偶极子形成机理的可用模型的基础上进行了讨论。可以预料，只有在良好的应力下才能创建特定的特征，而对于1/3 <211]断层的偶极环，并没有这样的特征。

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