摘要
本工作系统研究了强流脉冲离子束(HIPIB)辐照对6061铝合金表面摩擦学性能的调控机制及其强化机理。通过TEMP-6型HIPIB装置,以300 A·cm^(-2)的束流密度对6061铝合金进行五次脉冲辐照,结合显微硬度测试、摩擦磨损实验及多尺度表征手段,揭示了辐照参数对表面形貌、组织结构和摩擦磨损行为的影响规律。结果表明:HIPIB辐照诱导表面形成厚度约7μm的改性层,晶粒尺寸由原始50μm细化至20μm以下,表面硬度提升30%(达1800 MPa)。摩擦学测试显示,辐照后试样在大气环境中摩擦系数由0.67降至0.53,真空环境中进一步降至0.42,磨损量减少30%。载荷增加(0.2~0.5 N)促使磨损机制从磨粒磨损向氧化磨损转变,磨痕表面形成致密氧化膜,显著抑制材料转移和三体磨损。微观分析表明,辐照引发的晶粒细化、元素均匀化及残余压应力场协同提高了表面承载能力与抗塑性变形能力。研究证实,HIPIB技术通过非平衡热-力耦合效应实现耐磨性能的显著提升,为铝合金表面工程提供了创新解决方案。
This work systematically investigates the regulatory mechanism and strengthening mechanism of the surface tribological properties of 6061 aluminum alloy after irradiation by high-intensity pulsed ion beam(HIPIB).Using the TEMP-6 HIPIB device with a beam current density of 300 A·cm^(-2),6061 aluminum alloy was pulsed irradiated five times.Combined with microhardness testing,friction and wear experiments,and multi-scale characterization methods,the influence laws of irradiation parameters on surface morphology,microstructure,and friction-wear behavior were revealed.The results show that HIPIB irradiation induces the formation of a modified layer with a thickness of approximately 7μm on the surface.The grain size is refined from the original 50μm to below 20μm,and the surface hardness increases by 30%(reaching 1800 MPa).Tribological tests show that the friction coefficient of the irradiated sample decreases from 0.67 to 0.53 in the atmospheric environment and further to 0.42 in the vacuum environment,and the wear amount decreases by 30%.With the increase of load(0.2-0.5 N),the wear mechanism shifts from abrasive wear to oxidative wear.A dense oxide film forms on the wear scar surface,significantly inhibiting material transfer and tribo-milling.Microscopic analysis indicates that the grain refinement,element homogenization,and residual compressive stress field caused by irradiation have jointly enhanced the surface bearing capacity and resistance to plastic deformation.The research confirms that the HIPIB technology achieves a significant improvement in wear resistance through the non-equilibrium thermal-mechanical coupling effect,providing an innovative solution for surface engineering of aluminum alloys.
作者
连庆宙
唐鑫
李朋
LIAN Qingzhou;TANG Xin;LI Peng(China School of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,Guangxi,China;China School of Electronic and Electrical Engineering,Shangqiu Normal University,Shangqiu 476000,Henan,China)
出处
《材料导报》
北大核心
2025年第S2期532-540,共9页
Materials Reports
基金
商丘学者奖励计划项目(SQRC202212003)。
关键词
6061铝合金
强流脉冲离子束
表面改性
摩擦系数
磨损机制
晶粒细化
6061 aluminum alloy
high-intensity pulsed ion beam
surface modification
friction coefficient
wear mechanism
grain refinement
