A unique kind of distribution band of martensitic laths formed along {332}〈113〉 twin boundary in the Ti42Nb alloy subjected to instable deformation

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Characterization Pub Date : 2024-10-15 DOI:10.1016/j.matchar.2024.114460

引用次数: 0

Abstract

Multi-scale electron microscopy characterization of the {332}<113 > _β twins produced in the necking region near fracture surface of the deformed β-type Ti42Nb (wt%) alloy have been carried out. A unique kind of band-shaped zone with plenty of laths of two α″ martensitic subvariants distributed in about 90° crossing directions has been found to be formed in the {332}<113 > _β deformation twin along the twin boundary. This finding clearly reveals that intense local stress concentration and its complex accommodation process associated with the β-to-α″ and α″-to-β structural transitions can occur specially in the twinned region of stress-induced α″ martensite phase along its boundary for the β Ti alloy subjected to instable deformation. It is also clearly indicated that the local stress accommodation due to the α”-to-β structural transition can be unsymmetrical with respect to the twin boundary.

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受不稳定变形影响的 Ti42Nb 合金中沿 {332}〈113〉孪晶边界形成的一种独特的马氏体板条分布带

对变形β型 Ti42Nb (wt%) 合金断裂面附近缩颈区产生的 {332}<113 > β 双胞胎进行了多尺度电子显微镜表征。研究发现，在{332}<113 >β变形孪晶中，沿着孪晶边界形成了一种独特的带状区域，其中有大量的两个α″马氏体亚变体的板条，其交叉方向约为 90°。这一发现清楚地揭示出，对于受不稳定变形影响的 β Ti 合金而言，在应力诱导的 α″ 马氏体相的孪生区域内，会出现强烈的局部应力集中及其与 β 到 α″ 和 α″ 到 β 结构转变相关的复杂容纳过程。这也清楚地表明，α"-to-β 结构转变引起的局部应力容纳可能与孪晶边界不对称。

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

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.