摘要
采用机械合金化和粉末烧结的方法制备了纳米细晶/粗晶Al-Sn合金,研究了粗晶含量对合金微观形貌、摩擦形貌和耐磨性能的影响,探讨了Al-12Sn合金的磨损机制及影响因素。结果表明,机械合金化得到的双相双尺度Al-12Sn合金,在不同载荷下的摩擦系数要高于未添加粗晶的纯纳米晶Al-12Sn合金,但是低于纯粗晶Al-12Sn合金;当粗晶Al-12Sn粉末比例为30%时,烧结Al-12Sn合金具有最佳的抗摩擦磨损性能,其耐磨性能高于纯纳米晶和纯粗晶Al-12Sn合金,提高幅度分别约为1.5倍和2倍;随着粗晶Al-12Sn粉末比例的提高,合金的磨损机制从局部剥落演变为大面积摩擦层的剥落,并且摩擦表面的氧化摩擦层的数量不断降低。
Fine nanocrystalline/coarse grain Al-Sn alloys were prepared by mechanical alloying and powder sintering. The effect of coarse grain content on the microstructure, friction morphology and wear resistance of the alloy was investigated,and the wear mechanism and influencing factors of Al-12 Sn alloy were discussed. The results show that the friction coefficient of the dual-phase dual-scale Al-12 Sn alloy obtained by mechanical alloying under different loads is higher than that of pure nanocrystalline Al-12 Sn alloy without adding coarse grains, but lower than that of pure coarse crystalline Al-12 Sn alloy. When the coarse Al-12 Sn powder ratio is 30%, Al-12 Sn alloy presents the best friction and wear resistance.The wear resistance is much higher than that of pure nanocrystalline and pure coarse crystalline Al-12 Sn alloy, and the range of improvement is about 1.5 and 2 times, respectively. With the increase of the proportion of coarse Al-12 Sn powder,the wear mechanism of alloy changes from local spalling to spalling of large area of friction layer, and the number of oxide friction layer on the friction surface decreases continuously.
出处
《铸造技术》
北大核心
2017年第12期2832-2835,共4页
Foundry Technology
