CuAlBi合金摩擦磨损性能的研究

采用MMU-5G摩擦磨损试验机测试了CuAlBi合金在不同载荷和摩擦速度下摩擦系数的变化规律,并测出各对应条件下的磨损量。结果表明:合金的摩擦系数随载荷的增加先减小再增大,随着速度的增加而减小;其磨损量随速度、载荷的增加而增大。犁沟是主要的磨损失效形式。

CuAlBi合金经深冷处理后β→(α+γ_2)的相变动力学

采用DSC法研究了CuAlBi合金经深冷处理后组织中β!α+γ2的相变动力学。结果表明,当合金以10℃/min速率冷却时,其相变的起始温度和结束温度分别为530.12和506.99℃,相变时间为138.78s。该合金的相变激活能随着相变体积分数的增加而逐渐减小。

Effect of Heat Treatment on Microstructure of CuAlBi Alloy

The phase-transition point temperature and microstructure of CuAlBi alloy were analysed by DSC, metallographic examination, XRD and SEM/EDS, and the effect of heat treatment on microstructure of CuAlBi alloy was also discussed. The results show that the phase-transition point temperature of CuAlBi alloy is 561.7 ℃, and heat treatment can change the microstructure of CuAlBi alloy. As a result, it can offer the theoretical basis to choose the optimizing microstructure of CuAlBi alloy.

Influence of loading and rotation speed on Friction and Wear properties of CuAlBi Alloy

The variation of the friction coefficient of the CuAlBi alloy at different connecting loading and friction speed were investigated by using MMU-5G sliding friction-wear tester, besides, the wear mass loss of the CuAlBi alloy was measured, and the influence of loading and rotation speed on friction and wear properties of CuAlBi alloy was also discussed. The results show that the friction coefficient increase then decrease with increase of connecting loading as well as decreases with increase of friction speed, and the wear loss mass increases with increase of connecting loading and friction speed. As a result, the wear failure form of CuAlBi alloy is mainly ploughing.

深冷处理后铜铝铋合金在加热过程中的固态相变

采用热分析法测定了铜铝铋合金经深冷处理后在随后加热过程中发生α+γ2→β相变的相变温度和相变时间,并计算了其相变激活能。结果表明:随着加热速率的增大,该合金发生相变的温度逐渐升高,而相变完成时间则逐渐缩短,合金以20℃.min-1的速率升温时,发生α+γ2→β相变的起始温度为562.55℃,结束温度为587.27℃,相变时间为1.24 min;其相变激活能随着相变生成的β相数量的增加而逐渐减小。