{101¯2}张力和{112¯2}压缩孪晶对Ti中α到ω相变的作用

IF 5.6 2区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY
Khanh Dang, Laurent Capolungo
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引用次数: 0

摘要

预先存在的孪晶网络在六方紧密堆积(HCP) α Ti向ω六方Ti相变中的作用仍未被研究。在这项工作中,我们从热力学和动力学的角度研究了这些效应。我们利用各向同性和线弹性微力学模型以及MD模拟来确定预先存在的双胞胎对ω核稳定性的影响。从热力学角度来看,预先存在的{101¯2}张力和{112¯2}压缩孪晶均促进孪晶内ω核的成核(具有非共区取向关系),前者在减小临界半径从而减小整体激活势垒方面具有更大的作用。MD模拟表明,{112¯2}CTB阻止了ω核的生长,而{101¯2}CTB没有阻止ω核的生长;从而显示出短距离钉住边界的作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The role of {101¯2} tension and {112¯2} compression twins on the α to ω phase transformation in Ti

The role of {101¯2} tension and {112¯2} compression twins on the α to ω phase transformation in Ti
The role of preexisting twin networks on the phase transformation from hexagonal close packed (HCP) α Ti to ω hexagonal Ti remains relatively unexplored. In this work, we study these effects from both thermodynamics and kinetics standpoints. We utilize an isotropic and linear elasticity micromechanical model alongside MD simulations to determine the effects of preexisting twins on the stability of ω nucleus. It is found that from a thermodynamic standpoint, both preexisting {101¯2} tension and {112¯2} compression twins promote nucleation of ω nucleus (with non-cozone orientation relationship) within the twin, with the former having a greater effect in reducing the critical radius and thus the overall activation barrier. MD simulations reveal that the growth of the ω nucleus is stopped by the {112¯2} CTB but not the {101¯2} CTB; thereby showing the role of short-range pinning of boundaries.
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来源期刊
Scripta Materialia
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.
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