块体金属玻璃在纳米磨损下的加工硬化行为研究

doi:10.3901/JME.2025.01.265

摘要/Abstract

摘要： 基于热塑压印获得的原子级平整的Pt基块状金属玻璃(Pt-BMG)，采用原子力显微镜(AFM)研究了块体金属玻璃在纳米磨损下的加工硬化行为。研究发现：Pt-BMG在不同循环次数的磨损表现为两个阶段，低载荷阶段(57～108 nN)的磨损率明显高于高载荷阶段(216～324 nN)，这是由于低载下的磨损由表面氧化膜主导，高载下的磨损由Pt-BMG基体主导。随循环次数从1次增加至10次，Pt-BMG的磨损率呈现逐渐下降的趋势，下降的速率随次数增加而迅速减小，当循环次数从5次增加至10次过程中，Pt-BMG的磨损率几乎没有变化；通过JKR模型解耦纳米摩擦磨损中的黏着摩擦和犁耕摩擦发现，当循环次数从1次增加到5次，Pt-BMG在纳米磨损中的摩擦剪切强度由3.32 GPa迅速增加到5.20 GPa，次数进一步增加至10次时，摩擦剪切强度略有增加，为5.41 GPa，这与Pt-BMG磨损率随循环次数的变化规律吻合，证实了Pt-BMG在纳米磨损下存在加工硬化行为；Pt-BMG的加工硬化行为与应力状态、尺度密切相关，纳米尺度划痕条件下的受限应力状态促进了金属玻璃结构内原子的扩散弛豫能力，抑制了剪切局域化行为，使得结构弛豫湮灭自由体积的速率高于剪切膨胀产生自由体积的速率，导致结构致密化，从而产生块体金属玻璃纳米摩擦磨损的加工硬化现象。

关键词: 块体金属玻璃, 原子力显微镜, 纳米磨损, JKR模型, 加工硬化

Abstract: Based on an atomically flat Pt-based bulk metallic glass (Pt-BMG) processed by thermoplastic imprinting, the work hardening behavior of Pt-BMG under nanoscale wear is investigated by atomic force microscopy (AFM). It is found that the wear of Pt-BMG subjected to different number of cycles exhibited two distinct stages, and the wear rate at low load range (57 nN～108 nN) is significantly higher than that of the high load range (216～324 nN). This is because the wear under low loads is dominated by the surface oxide film, while the wear under high loads is controlled by the Pt-BMG matrix. With increasing the number of cycles from 1 to 10, the wear rate of Pt-BMG demonstrates a gradual decreasing trend, and the decreasing trend became more and more pronounced with the increase in cycle number. Specially, the wear rate of Pt-BMG is almost unchanged when the number of cycles is increased from 5 to 10; By decoupling the contribution of adhesive friction and plowing friction in wear with JKR model, the shear strength to displace the material ahead of the tip increases significantly from 3.32 GPa to 5.20 GPa with increasing the number of cycles from 1 to 5. Further increasing the cycle number to 10, the shear strength increases slightly to 5.41 GPa. This coincides with the trend of the wear rate versus the number of cycles, and thus verifies the existence of the work hardening effect of Pt-BMG occurred in nanoscale wear; The work hardening behavior observed in nanoscale wear of Pt-BMG is strongly dependent on the stress state and deformation scale, and the confined stress state under the nanoscale scratch condition promotes the atomic diffusive relaxation ability within the stressed volume in structure and inhibits the shear localization. As a result, the annihilation rate of free volume induced by structural relaxation is faster than that of free volume generation rate induced by shear dilation, therefore leading to the structural densification and the resultant work hardening effect.

Key words: bulk metallic glass, atomic force microscope, nanoscale wear, JKR model, work hardening

中图分类号:

TH117

张安, 刘凌志, 古泽芳, 赵凡, 赖建平, 胡海龙, 袁卫锋, 余家欣. 块体金属玻璃在纳米磨损下的加工硬化行为研究[J]. 机械工程学报, 2025, 61(1): 265-273.

ZHANG An, LIU Lingzhi, GU Zefang, ZHAO Fan, LAI Jianping, HU Hailong, YUAN Weifeng, YU Jiaxin. Investigation on Work Hardening Behavior of Bulk Metallic Glass under Nanoscale Wear[J]. Journal of Mechanical Engineering, 2025, 61(1): 265-273.

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