预变形对TiB2/7055复合材料摩擦磨损性及耐蚀性的影响

doi:10.13251/j.issn.0254-6051.2026.02.041

摘要/Abstract

摘要： 通过对TiB₂/7055复合材料施加0%~6.0%的室温预变形,利用电化学测试、摩擦磨损试验及SEM/TEM表征,系统研究了不同预变形量对固溶-预变形-时效处理后TiB₂/7055复合材料耐蚀性以及摩擦磨损行为的影响。结果表明,随着预变形量的增加,时效态TiB₂/7055复合材料中的析出相由粗大团簇状逐渐细化并弥散分布,在预变形量为3.0%时实现较好的弥散分布,进一步增大预变形量会使缺陷聚集,导致析出相尺寸增大,分布均匀性逐渐下降。当预变形量小于3.0%时,复合材料的摩擦曲线波动范围、最大磨痕深度以及宽度均随预变形量的增加逐渐增大,磨损机制逐渐向黏着磨损转变,耐磨性逐渐变差。预变形量超过3.0%时,复合材料的磨损曲线波动范围、最大磨痕深度以及宽度均随预变形量的增加逐渐减小,磨损机制变为黏着磨损和磨粒磨损的混合模式,耐磨性逐渐增强。在预变形量为3.0%时,复合材料对应的阻抗弧半径更大、自腐蚀电位更正且自腐蚀电流较低,晶界处无沉淀析出带(PFZ)宽度为19 nm,且晶界析出物分布离散,具有更好的耐蚀性。

关键词: TiB₂/7055复合材料, 预变形, 耐磨性, 磨损机制, 耐蚀性

Abstract: Effect of room-temperature pre-deformation, ranging from 0% to 6.0%, on the corrosion resistance and wear behavior of TiB₂/7055 composites was systematically investigated after solution-pre-deformation-aging treatment through electrochemical tests, friction-wear experiments, and SEM/TEM characterization. The results indicate that with the increase of pre-deformation, the precipitates in the composites evolve from coarse clusters to a refined and more dispersed morphology. An optimal uniform distribution is achieved at pre-deformation of 3.0%, beyond this level, further increasing deformation promotes defect accumulation, leading to precipitate coarsening and a gradual deterioration in distribution homogeneity. When the pre-deformation is less than 3.0%, the fluctuation range of the friction curve, maximum wear scar depth, and width of the composite gradually increase with the increase of pre-deformation. The wear mechanism progressively shifts toward adhesive wear, resulting in gradually deteriorating wear resistance. When the pre-deformation exceeds 3.0%, the fluctuation range of the wear curve, maximum wear scar depth, and width of the composite gradually decrease with further increase of pre-deformation. The wear mechanism transitions to a mixed mode of adhesive wear and abrasive wear, leading to gradually enhanced wear resistance. At a pre-deformation of 3.0%, the composite exhibits a larger impedance arc radius, a more positive self-corrosion potential, and a lower self-corrosion current. The width of the precipitate-free zone (PFZ) at the grain boundaries is measured to be 19 nm, and the grain boundary precipitates are discretely distributed, contributing to improved corrosion resistance.

Key words: TiB₂/7055 composites, pre-deformation, wear resistance, wear mechanism, corrosion resistance

中图分类号:

TB333

王明, 吉新宇, 杨磊峰, 陈羿帆, 周东帅, 百志好, 王健. 预变形对TiB₂/7055复合材料摩擦磨损性及耐蚀性的影响[J]. 金属热处理, 2026, 51(2): 278-285.

Wang Ming, Ji Xinyu, Yang Leifeng, Chen Yifan, Zhou Dongshuai, Bai Zhihao, Wang Jian. Effect of pre-deformation on corrosion resistance and wear properties of TiB₂/7055 composites[J]. Heat Treatment of Metals, 2026, 51(2): 278-285.

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预变形对TiB₂/7055复合材料摩擦磨损性及耐蚀性的影响

Effect of pre-deformation on corrosion resistance and wear properties of TiB₂/7055 composites

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