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首页> 外文期刊>Journal of Physics. Condensed Matter >Deformation twinning in a creep-deformed nanolaminate structure
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Deformation twinning in a creep-deformed nanolaminate structure

机译：蠕变变形纳米层状结构中的变形孪生

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摘要

The underlying mechanism of deformation twinning occurring in a TiAl-(γ)/Ti_3Al-(α_2) nanolaminate creep deformed at elevated temperatures has been studied. Since the multiplication and propagation of lattice dislocations in both γ and α_2 thin lamellae are very limited, the total flow of lattice dislocations becomes insufficient to accommodate the accumulated creep strains. Consequently, the movement of interfacial dislocations along the laminate interfaces, i.e., interface sliding, becomes an alternative deformation mode of the nanolaminate structure. Pile-ups of interfacial dislocations occur when interfacial ledges and impinged lattice dislocations act as obstacles to impede the movement of interfacial dislocations. Deformation twinning can accordingly take place to relieve a stress concentration resulting from the pile-up of interfacial dislocations. An interface-controlled twinning mechanism driven by the pile-up and dissociation of interfacial dislocations is accordingly proposed.
机译：研究了在高温下变形的TiAl-（γ）/ Ti_3Al-（α_2）纳米叠层蠕变中发生孪生变形的潜在机理。由于γ和α_2薄层中晶格位错的扩散和传播非常有限，因此晶格位错的总流量变得不足以容纳累积的蠕变应变。因此，沿着层合物界面的界面位错的运动，即界面滑动，成为纳米层状结构的替代变形模式。当界面壁架和撞击的晶格位错充当阻碍界面位错运动的障碍时，就会发生界面位错的堆积。因此，可以发生变形孪晶以减轻由于界面位错的堆积而引起的应力集中。因此，提出了一种由界面位错的堆积和解离驱动的界面控制孪晶机制。

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