Formation of {112¯2} contraction twins in titanium through reversible martensitic phase transformation
Formation of {112¯2} contraction twins in titanium through reversible martensitic phase transformation
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DOI：
10.1016/j.scriptamat.2020.113694
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发表时间：
2021-04
影响因子：
6
通讯作者：
Amir Hassan Zahiri;Jamie Ombogo;Lei Cao
中科院分区：
文献类型：
--
作者：
Amir Hassan Zahiri;Jamie Ombogo;Lei Cao
我们报告了α-钛通过可逆α→ω→α马氏体相变发现了非常规的{11.2¯2}孪晶机制。具体来说，母相α-首先转变为中间ω-相，然后迅速转变为孪晶α-相，形成{11²¯2}收缩孪晶。此外，我们还证明了可逆α→ω→α相变在母相α-、中间相ω-和孪相α-之间遵循严格的取向关系。最后，我们证明了我们的机制在洗牌、剪切和共轭孪晶平面上符合经典孪晶理论。本研究揭示了中间ω相在孪晶过程中的重要作用，为{11.2¯2}孪晶的现有机制增添了关键细节。
We report the discovery of a non-conventional {11 2¯ 2} twinning mechanism in α-titanium through reversible α→ ω→ α martensitic phase transformations. Specifically, the parent α-phase first transforms into an intermediate ω-phase, which then quickly transforms into a twin α-phase, leading to the formation of {11 2¯ 2} contraction twins. In addition, we prove that the reversible α→ ω→ α phase transformations follow strict orientation relations between the parent α-, intermediate ω-, and twin α-phases. Finally, we demonstrate that our mechanism agrees with classical twinning theory in the shuffle, shear, and conjugate twinning plane. This study reveals the important role of the intermediate ω-phase in the twinning process, adding critical details to the existing mechanism of {11 2¯ 2} twinning.