Microstructure and properties of Ti-6Al-4V/Ni-Ti heterogeneous structure with CuNi interlayer fabricated by wire-arc directed energy deposition

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

Materials Characterization Pub Date : 2025-06-15 DOI:10.1016/j.matchar.2025.115278

Jian Han , Meiqing Meng , Xinya Chen , Hanzhao Zhu , Jun Lan , Zhetao Liang , Yinbao Tian

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Abstract

The fabrication of a Ti-6Al-4V/Ni-Ti heterogeneous structure encounters significant challenges, primarily owing to the formation of brittle TiNi intermetallic compounds (IMCs) at the interface, inducing stress concentration and reducing the interfacial joining strength. To address this issue, the present study employs the wire-arc directed energy deposition technology and introduces a CuNi interlayer to optimize the interfacial microstructure and mechanical properties. The results indicate that the CuNi interlayer effectively suppresses the formation of brittle TiNi IMCs and promotes the formation of TiCu and Ti-Ni-Cu phases, thus enhancing the interfacial strength. The microhardness of the interlayer attains a value of 570 HV_0.2, while the as-built wall achieves an average ultimate tensile strength of 279.9 ± 15 MPa and a strain of 5.6 % ± 2 %. The developed strategy is effective for the interfacial optimization of heterogeneous structures and has significant potential for applications in the aerospace industry.

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线弧定向能沉积制备Ti-6Al-4V/Ni-Ti非均相CuNi夹层结构的组织与性能

Ti-6Al-4V/Ni-Ti非均相结构的制备面临着巨大的挑战，主要是由于在界面处形成脆性的TiNi金属间化合物（IMCs），引起应力集中，降低了界面连接强度。为了解决这一问题，本研究采用线弧定向能沉积技术，并引入CuNi夹层来优化界面微观结构和力学性能。结果表明，CuNi夹层有效抑制了脆性TiNi IMCs的形成，促进了TiCu和Ti-Ni-Cu相的形成，从而提高了界面强度。中间层的显微硬度达到570 HV0.2，而筑墙的平均极限抗拉强度为279.9±15 MPa，应变为5.6%±2%。该策略对非均质结构的界面优化是有效的，在航空航天工业中具有重要的应用潜力。

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.