Effect of SiC addition on the microstructure and properties of Ti6Al4V by selective laser melting

IF 5.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Journal of Alloys and Compounds Pub Date : 2024-10-30 DOI:10.1016/j.jallcom.2024.177330

Xinke Li, Congxiang Qin, Yukun An, Yinling Zhang, Zhonggang Sun, Ertuan Zhao

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引用次数: 0

Abstract

The fine crystalline behavior of SiC/Ti6Al4V is revealed in this study. Titanium matrix composites (TMCs) with different types, amounts, and morphologies of second phases were prepared in situ by adding different contents of SiC. The grain refinement mechanism of multi-phase synergistic was analyzed, and the synergistic contribution of the in-situ second phases (TiC, Ti₅Si₃, and Ti₃Si) as well as the fine grain organization to the strengthening of the materials was quantitatively evaluated. The results show that the quasi-continuous network structure formed by the in situ TiC and Ti₅Si₃ phases inhibits grain growth and completes the equiaxed transformation of β-grains. Meanwhile, the TiC phase provides a large number of nucleation sites for the α-Ti phase, which promotes the nucleation of the matrix phase. Finally, the aspect ratio of the α phase was reduced from 5.8 to 3.1, while the β grain size was refined from 20.0 to 1.7 µm. The matrix hardness (6.3 GPa) and compressive yield strength (1692 MPa) of TMC were increased by 37% and 67.4% respectively compared with Ti6Al4V. Fine grain strengthening accounted for 71.2% of the total strengthening increase. The load-bearing strengthening caused by TiC, Ti₅Si₃ and Ti₃Si accounted for 6.0%, 11.6% and 3.0% of the total strengthening increase, respectively.

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通过选择性激光熔融技术添加碳化硅对 Ti6Al4V 的微观结构和性能的影响

本研究揭示了 SiC/Ti6Al4V 的精细结晶行为。通过添加不同含量的 SiC，原位制备了具有不同类型、数量和形态的第二相的钛基复合材料（TMC）。分析了多相协同的晶粒细化机理，并定量评估了原位第二相（TiC、Ti5Si3 和 Ti3Si）以及细晶粒组织对材料强化的协同贡献。结果表明，原位 TiC 和 Ti5Si3 相形成的准连续网络结构抑制了晶粒生长，并完成了 β 晶粒的等轴转变。同时，TiC 相为 α-Ti 相提供了大量的成核点，从而促进了基体相的成核。最后，α 相的长宽比从 5.8 减小到 3.1，而 β 晶粒大小则从 20.0 微米细化到 1.7 微米。与 Ti6Al4V 相比，TMC 的基体硬度（6.3 GPa）和抗压屈服强度（1692 MPa）分别提高了 37% 和 67.4%。细晶粒强化占总强化增加量的 71.2%。由 TiC、Ti5Si3 和 Ti3Si 引起的承载强化分别占总强化增加量的 6.0%、11.6% 和 3.0%。

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来源期刊

Journal of Alloys and Compounds 工程技术-材料科学：综合

CiteScore

11.10

自引率

14.50%

发文量

5146

审稿时长

67 days

期刊介绍： The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.