Microstructure and mechanical properties of laminated Ti-TiBw/Ti composites fabricated by wire arc additive manufacturing

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.2024.114512

Xiang Yi , Xingwang Bai , Runyao Yu , Xiangman Zhou , Runsheng Li , Fazhi Li

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Abstract

To achieve the synergetic improvement of the strength and ductility of titanium matrix composites (TMCs), in this study, flux-cored wires were customized and combined with the wire arc additive manufacturing (WAAM) process to fabricate laminated Ti-TiBw/Ti composites. The diffusion behavior of the reinforcement during the WAAM deposition process was studied in detail. By optimizing the process parameters to regulate the distribution of the reinforcement, the composites presented a laminated structure on the macroscale and a non-uniform distributed network structure on the microscale. Compared with pure titanium, the ultimate tensile strengths and ductility of the laminated Ti-TiBw/Ti composites have both improved. The ultimate tensile strengths of the composites with 5 vol% and 10 vol% TiBw/Ti layers are 574 MPa and 663 MPa, respectively, and the fracture elongation are 27.74 % and 24.95 %, respectively. This heterogeneous structure of TMCs reconciles the contradiction between strength and ductility, mainly attributed to the strengthening effect of in-situ synthesized TiBw and the toughening effect of the laminated structure and the TiBw network structure.

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线弧快速成型技术制造的层状钛-钛铍-钛复合材料的微观结构和力学性能

为实现钛基复合材料（TMC）强度和延展性的协同改善，本研究定制了药芯焊丝，并将其与线弧快速成型（WAAM）工艺相结合，制造出了层状钛-钛-铍-钛复合材料。详细研究了 WAAM 沉积过程中增强体的扩散行为。通过优化工艺参数来调节增强材料的分布，复合材料在宏观上呈现出层状结构，在微观上呈现出非均匀分布的网络结构。与纯钛相比，层状 Ti-TiBw/Ti 复合材料的极限拉伸强度和延展性都有所提高。TiBw/Ti 层含量分别为 5 Vol% 和 10 Vol% 的复合材料的极限拉伸强度分别为 574 MPa 和 663 MPa，断裂伸长率分别为 27.74 % 和 24.95 %。TMC 的这种异质结构调和了强度与延展性之间的矛盾，主要归因于原位合成 TiBw 的增强效应以及层状结构和 TiBw 网络结构的增韧效应。

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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.