Local characterization of mechanical properties and deformation mechanisms of SPS graded strain-transformable Ti-Nb alloy

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-10-22 DOI:10.1016/j.matchar.2024.114482

Clémence Fontaine , Lola Lilensten , Dalibor Preisler , Josef Strasky , Mathilde Laurent-Brocq , Philippe Chevallier , Amélie Fillon , Daniel Galy , Milos Janecek , Frédéric Prima

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Abstract

Compositional boundaries of activity regarding transformation-induced plasticity and mechanical twinning (TRIP/TWIP) in Ti-Nb alloying system is determined by a novel methodology using chemically graded samples prepared by Spark Plasma Sintering. Presented methods of characterization include nanoindentation and microindentation testing complemented by EBSD analyses. The link between composition, microstructure, deformation mechanisms and mechanical properties can be established. Applied to the Ti-Nb system for a proof of concept, both the identification of local mechanical properties with respect to composition, and the refinement of the compositional ranges within which the different deformation mechanisms occur can be obtained. The graded sample ranging from 14 at.% to 34 at.% Nb is studied. TRIP/TWIP activity is resolved by EBSD in range 17 to 24 at.% of Nb, which is significantly lower than the results from the literature. This difference is attributed to the presence of interstitial oxygen (2470 ± 60 weight ppm).

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SPS 梯度应变可变形钛铌合金机械性能和变形机制的局部表征

通过火花等离子烧结法制备的化学分级样品，采用一种新方法确定了钛铌合金体系中转化诱导塑性和机械孪晶（TRIP/TWIP）活性的成分边界。介绍的表征方法包括纳米压痕和微压痕测试，并辅以 EBSD 分析。可以建立成分、微观结构、变形机制和机械性能之间的联系。应用于钛-铌系统的概念验证，既能确定与成分有关的局部机械性能，又能细化发生不同变形机制的成分范围。我们对铌含量从 14% 到 34% 的分级样品进行了研究。在铌含量为 17% 至 24% 的范围内，TRIP/TWIP 活性通过 EBSD 得到了解析，这明显低于文献中的结果。这种差异归因于间隙氧（2470 ± 60 重量ppm）的存在。

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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.