TA7钛合金渗氮层的磨损机制

doi:10.13251/j.issn.0254-6051.2025.04.039

摘要/Abstract

摘要： 利用离子渗氮技术在TA7钛合金表面制备了渗氮层。采用摩擦磨损试验机、X射线衍射仪、硬度计、扫描电镜、透射电镜等对渗氮层的微观组织、表面硬度、摩擦学性能与磨损机制进行了研究。结果表明,TA7钛合金经800 ℃离子渗氮10 h后,渗氮层厚度约5 μm,物相主要由TiN和Ti₂N组成。渗氮层表面硬度可达1183.6 HV0.05,与未渗氮试样相比提高了约2.6倍。渗氮层提高了TA7钛合金的耐磨性能,与未渗氮试样相比,磨损率降低99.3%以上。TA7钛合金经离子渗氮后,磨损机制由剧烈的磨粒磨损转变为轻微的粘着磨损和氧化磨损。渗氮层磨痕亚表面物相主要为Ti₂N,摩擦诱导周期性结构是渗氮层摩擦的主要作用机制。

关键词: TA7钛合金, 离子渗氮, 磨损率, 磨损机制

Abstract: A nitrided layer was prepared on TA7 titanium alloy by plasma nitriding technology. The microstructure, hardness, tribological properties and wear mechanism of the nitrided layer were investigated by means of friction and wear testing, X-ray diffraction (XRD), hardness tester, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that after plasma nitriding at 800 ℃ for 10 h, the thickness of the nitrided layer is about 5 μm, which is composed of TiN and Ti₂N. The surface hardness of the nitrided specimen can reach 1183.6 HV0.05, which is about 2.6 times higher than that of the unnitrided specimen. The wear resistance of TA7 titanium alloy is improved after nitriding, as the wear rate of the nitrided specimen is reduced by more than 99.3% compared with that of the unnitrided specimen. The evolution of wear of nitrided layer is from the abrasive wear into the slightly adhesive and oxidative wear. The main phase composition of the subsurface of the nitrided layer is Ti₂N. Friction-induced periodic structure is the main wear mechanism of the nitrided layer.

Key words: TA7 titanium alloy, plasma nitriding, wear rate, wear mechanism

中图分类号:

TG156.8⁺2

张永亮, 贺瑞军, 朱硕, 韩啸, 孔令利, 王赟, 郭凯宇. TA7钛合金渗氮层的磨损机制[J]. 金属热处理, 2025, 50(4): 252-258.

Zhang Yongliang, He Ruijun, Zhu Shuo, Han Xiao, Kong Lingli, Wang Yun, Guo Kaiyu. Wear mechanism of TA7 titanium alloy nitrided layer[J]. Heat Treatment of Metals, 2025, 50(4): 252-258.

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