| 引用本文: | 贲家明,吴嘉俊,纪秀林,何涛强.激光冲击对钛基非晶合金摩擦学性能的影响[J].中国表面工程,2024,37(4):161~170 |
| BEN Jiaming,WU Jiajun,JI Xiulin,HE Taoqiang.Effects of Laser Shock Peening on Tribological Properties of Ti-based Amorphous Alloy[J].China Surface Engineering,2024,37(4):161~170 |
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| 摘要: |
| 非晶合金具有高硬度、高强度和良好的耐磨耐蚀性，但较差的室温塑性限制了其摩擦学性能的提高。为提高钛基非晶合金的摩擦学性能，采用脉冲能量分别为 3、5 和 7 J，光斑直径 3 mm 及搭接率 50%的激光冲击工艺对钛基非晶合金 Ti32.85Zr30.21Cu9Ni5.28Be22.66 进行强化处理，并重点研究钛基非晶合金在 3.5% NaCl 模拟海水环境中的摩擦学性能。XRD 图谱表明：该非晶合金在激光冲击处理前后的晶态结构没有发生明显变化，但是激光冲击显著提高了钛基非晶合金的被冲击表面和横截面的硬度，而且随着激光脉冲能量的增加，硬度提升效果增强，表面粗糙度增大。另一方面，激光冲击强化显著提高了钛基非晶合金在模拟海水环境中的耐腐蚀性能。在 20 N 载荷的滑动条件下，7 J 脉冲能量冲击后的腐蚀速率较铸态样品降低了约 47.2%，同时激光冲击也显著降低了钛基非晶合金的腐蚀磨损率，而且该磨损率随着激光脉冲能量的增大而降低。在 10 N 载荷下，7 J 脉冲能量冲击后的磨损率较铸态样品降低约 47.3%。钛基非晶合金的主要磨损机制为粘着磨损。激光冲击有利于钛基非晶合金的再钝化、抑制塑性变形和粘着倾向，进而提升其在腐蚀环境下的摩擦学性能。激光冲击强化显著提高了钛基非晶合金的抗腐蚀性能和腐蚀磨损性能，这为促进非晶合金及其涂层的工程应用提供了新的思路。 |
| 关键词: 激光冲击 摩擦学性能 非晶合金 腐蚀磨损 |
| DOI：10.11933/j.issn.1007-9289.20230728001 |
| 分类号:TH117 |
| 基金项目:国家自然科学基金（51875169）；汕头大学卓越人才计划（NTF21011） |
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| Effects of Laser Shock Peening on Tribological Properties of Ti-based Amorphous Alloy |
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BEN Jiaming，WU Jiajun，JI Xiulin，HE Taoqiang
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College of Engineering, Shantou University, Shantou 515063 , China
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| Abstract: |
| Bulk amorphous alloys are promising engineering materials owing to their increased hardness, high strength, good corrosion resistance, and wear resistance. They have a wide range of applications in biomedical, marine engineering, and aerospace fields; however, their poor room-temperature plasticity limits the improvement of their tribological properties. We used a copper-mold spray casting technique to prepare a titanium-based amorphous alloy (Ti32.85Zr30.21Cu9Ni5.28Be22.66) and investigate the enhancement of its tribological properties. Subsequently, laser-shock treatment was employed, utilizing pulse energies of 3 J, 5 J, and 7 J; pulse widths of 15 ns; a repetition rate of 0.5 Hz; spot diameter of 3 mm; and lap rate of 50%. Our investigation delved into multiple facets to comprehensively understand the impact of laser shock peening on this alloy. First, we examined the mechanical properties of the alloy specimen after laser shock treatment by evaluating both the surface and cross-sectional hardness. Additionally, we conducted X-ray diffraction (XRD) tests to explore any changes in the amorphous structure of the samples before and after laser shock treatment. Moreover, our research extended to the study of corrosion resistance of the specimens. We utilized a Gamry 1010E electrochemical workstation to measure the electrode potential and polarization curves of the amorphous samples in a 3.5% NaCl solution under varying laser pulse energies. Subsequently, we used a CFT-1 multifunctional friction and wear testing machine in conjunction with a Gamry 1010E electrochemical workstation to assess the tribological properties of the specimens. Finally, we elucidated the wear mechanism of the specimens by closely observing the wear morphology using a JSM6360-type scanning electron microscope. Notably, our XRD analysis revealed no obvious difference between the Ti-based amorphous alloys before and after the laser shock treatment. Importantly, we found that laser shock peening significantly enhanced the hardness and surface roughness of the impacted surface, as well as the cross-sectional hardness of the titanium-based amorphous alloys. Furthermore, this effect became more pronounced with increasing laser pulse energy, although the surface roughness exhibited a nuanced trend of initially increasing and subsequently decreasing. Additionally, laser shock peening demonstrated a remarkable capacity to augment the corrosion resistance of the titanium-based amorphous alloys in a simulated seawater environment. The residual stress generated by this process effectively mitigated the corrosion rate, although the improved surface roughness only marginally increased it. For instance, specimens impacted with a 3 J pulse energy displayed slight residual compressive stress and notably higher corrosion rates compared to the cast samples. Conversely, under a 20 N load and 7 J pulse energy, the corrosion rate was reduced by approximately 47.2% compared to that of the cast sample. Moreover, laser shock treatment substantially reduced both the corrosion and wear rates in titanium-based amorphous alloys, and this reduction became more pronounced as the laser pulse energy increased. For instance, at a 10 N load, the wear rate after a 7-J pulse energy impact decreased by approximately 47.3% compared to that of the cast sample. Notably, the friction factor of the titanium-based amorphous alloy exhibited minimal change. The main wear mechanism of Ti-based amorphous alloys is adhesive wear. Laser shock is beneficial for the re-passivation of titanium-based amorphous alloys, inhibits plastic deformation and adhesion tendency, and improves their tribological properties in corrosive environments. After laser shock, the corrosion and wear performance of titanium-based amorphous alloys are improved, which provides a theoretical basis for the future application of titanium-based amorphous alloys. |
| Key words: laser shock peening tribological property amorphous alloy corrosive wear |
