不同热处理下2024铝合金摩擦磨损行为和机理

Friction and Wear Behavior and Mechanism of 2024 Aluminum Alloy with Different Heat Treatments

采用单因素法,通过GCr15钢球与2024铝合金的干滑动摩擦磨损实验,研究载荷和滑动速度对2024铝合金摩擦磨损性能的影响,并通过磨损率、摩擦因数以及表面磨损形貌对T4和T6态2024铝合金的磨损机理进行对比分析。实验结果表明,载荷和滑动速度对平均摩擦因数影响不明显,在低载荷低滑动速度下,摩擦因数存在较大波动,随着载荷和滑动速度的提高,摩擦因数逐渐趋于平稳,T6态铝合金平均摩擦因数低于T4态;磨损量随载荷和滑动速度增大呈现非线性增长,磨损率随载荷和滑动速度增大而降低,磨损速度降低,T6态铝合金的磨损量和磨损率均低于T4态;在低载荷低滑动速度下主要发生黏着磨损,随载荷和滑动速度提高,磨粒磨损和疲劳剥层磨损成为主要磨损形式。整体而言,T6态2024铝合金耐磨性能优于T4态。

Using the single-factor method,dry sliding friction wear experiments were carried out on 2024 aluminum alloy by GCr15 steel balls to study the effects of load and sliding speed on the friction and wear properties of 2024 aluminum alloys,and the wear mechanism of 2024 aluminum alloy in T6 temper was compared and analyzed.Experimental results showed that the load and sliding speed had trace effect on the average coefficient of friction,and there was greater volatility in the friction coefficient at low loads and low sliding speeds,with the friction coefficient progressively stabilizing as the load and sliding speed increase.The average coefficient of friction of T6 state aluminum alloy was lower than the T4 state aluminum alloy.Wear volume increases non-linearly with increasing load and sliding speed,whereas wear rate drops as load and sliding speed increase,resulting in a reduced wear speed.T6 state aluminum alloy had a lower wear volume and wear rate than T4 state aluminum alloy.Adhesive and abrasive wear were the most common forms of wear at low loads and low sliding speeds;as load and sliding speed increase,abrasive and fatigue delamination wear become the most popular.Overall,T6 state 2024 aluminum alloy has a higher wear resistance than T4 state.