Abnormal twin-twin interaction by {112¯2} twinning in [0001]-oriented micropillar of pure titanium at cryogenic temperature

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2024-10-07 DOI:10.1016/j.scriptamat.2024.116402

Min-Su Lee , Nicolò Maria della Ventura , Amit Sharma , Chunhua Tian , Xavier Maeder , Tea-Sung Jun

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Abstract

Uniaxial compression tests were performed on [0001]-oriented micropillars of pure titanium at cryogenic temperature (T = 205 K). The interaction between {

11 \bar{2} 2

} twin variants activated in the micropillar was investigated by transmission Kikuchi diffraction (TKD) in scanning electron microscope (SEM) and precession electron diffraction (PED) in transmission electron microscope (TEM). Critical resolved shear stress (CRSS) for {

11 \bar{2} 2

} twinning was estimated to be 471

\pm

40 MPa. The sudden stress-drops were induced by twinning, and the subsequent stress-strain response was dependent on the twin-twin interaction. The interaction between nano-size twins resulted in the formation of abnormal twin-twin boundaries (TTBs), thereby suppressed the twin growth and reduced the twinning-induced stress-drop. The complicated twin structures led to the strain-hardening after the stress-drop.

Abstract Image

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低温下纯钛的[0001]取向微柱中{112¯2}孪晶产生的异常孪晶相互作用

在低温（T = 205 K）下对纯钛的[0001]取向微柱进行了单轴压缩试验。通过扫描电子显微镜（SEM）中的透射菊池衍射（TKD）和透射电子显微镜（TEM）中的前驱电子衍射（PED）研究了微柱中活化的{112¯2}孪晶变体之间的相互作用。{112¯2}孪晶的临界分辨剪切应力（CRSS）估计为 471 ± 40 兆帕。孪晶诱发了突然的应力下降，随后的应力-应变响应取决于孪晶-孪晶之间的相互作用。纳米级孪晶之间的相互作用导致异常孪晶边界（TTB）的形成，从而抑制了孪晶的生长，降低了孪晶诱导的应力下降。复杂的孪生结构导致了应力下降后的应变硬化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.