痕量 Sc 添加对激光熔融沉积加工的 2024/TiC 复合涂层机械性能和磨损行为的影响

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear Pub Date : 2024-10-16 DOI:10.1016/j.wear.2024.205598

Yan Liu, Hang Lv, Qilin Yang, Hui Chen

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引用次数: 0

摘要

本研究在 2024 铝合金表面沉积了添加不同 Sc 的铝基复合涂层。研究并讨论了 Sc 元素对复合涂层微观结构和性能的影响。结果表明，适量添加 Sc（0.2 wt %）可细化晶粒、降低孔隙率、消除微裂纹并改善复合涂层的 TiC 分布。然而，过量添加 Sc 会增加 Al-Cu-Sc 三元相的含量，导致强度下降。此外，添加 0.2 wt % Sc 的复合涂层的拉伸性能最好，极限拉伸强度为 256 MPa，伸长率为 4.16 %，分别比原始复合涂层高出 54.4 % 和 8.9 %。摩擦温度对复合涂层的磨损机理有很大影响。添加 0.2 wt% Sc 的复合涂层在不同温度下的磨损率最低。添加 0.2 wt% Sc 后，复合涂层的微观结构明显改善，TiC 颗粒的分布更加均匀。细晶粒强化、分散强化和溶液强化的协同效应有助于提高复合涂层的强度和塑性。此外，TiC 与基体之间更牢固的结合也改善了复合涂层的摩擦性能。

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The effects of trace Sc addition on mechanical property and wear behavior of 2024/TiC composite coating processed by laser melting deposition

In the present work, Al-based composite coatings with various Sc additions were deposited on the surface of 2024 aluminium alloy. The effects of Sc element on the microstructure and performance of composite coating were investigated and discussed. The results showed that a moderate Sc addition (0.2 wt %) could refine the grains, reduce the porosity, eliminate micro-cracks, and improve the TiC distribution of composite coating. However, an excessive addition of Sc increased the content of Al-Cu-Sc ternary phase, resulting in the decrease of strength. In addition, the composite coating with 0.2 wt % Sc addition exhibited the best tensile properties with an ultimate tensile strength of 256 MPa and an elongation of 4.16 %, which was 54.4 % and 8.9 % higher than that of original composite coating, respectively. The friction temperature had a great impact on the wear mechanism of composite coatings. The composite coating with 0.2 wt % Sc addition exhibited the lowest wear rate at various temperature.

With 0.2 wt% Sc addition, the microstructure of composite coating was refined significantly, along with a more uniform distribution of TiC particles. The synergetic effect of fine-grain strengthening, dispersion strengthening, and solution strengthening contributed to the improvement of strength and plasticity for composite coating. In addition, a more robust bonding between TiC and matrix also improve the friction performance of composite coating.

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.