ω析出及其对 TNM Ti-Al 合金变形机制的影响

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

Materials Characterization Pub Date : 2024-11-01 DOI:10.1016/j.matchar.2024.114509

Guy Molénat, Jean-Philippe Monchoux, Bénédicte Warot-Fonrose, Alain Couret

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引用次数: 0

摘要

透射电子显微镜用于研究位于 TNM-TiAl 合金β-相中的ω型相纳米沉淀物的结构和形态。利用传统和高分辨率成像技术，证明了这种ω-沉淀以针状纳米沉淀物的形式出现，其特征尺寸为几纳米。电子衍射图案分析表明，这些沉淀物属于可转移的ω "相。然后，研究了这些纳米沉淀物如何影响该β-相在室温下的位错滑行机制。为此，对析出物密度和位错钉点进行了定量测量。这些数据的比较表明，只有最大的析出物才是位错钉点。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

ω precipitation and its influence on the deformation mechanisms of a TNM Ti-Al alloy

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ω precipitation and its influence on the deformation mechanisms of a TNM Ti-Al alloy

Transmission electron microscopy is used to study the structure and morphology of nanoprecipitates of ω-type phase located in the β_o-phase of a TNM-TiAl alloy. Using conventional and high-resolution imaging techniques, it is demonstrated that this ω- precipitation takes the form of needle-shaped nanoprecipitates that have characteristic dimensions of a few nanometers. Analyses of electronic diffraction patterns show that these precipitates are of a metastable ω” phase.

Then, it is investigated how these nanoprecipitates affect the dislocation glide mechanism at room temperature in this β_o-phase. For this purpose, quantitative measurements of densities of precipitates and of dislocation pinning points are developed. A comparison of these data indicates that only the largest precipitates serve as dislocations' pinning points.

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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.