连铸连轧镁合金AZ41微观结构与摩擦磨损性能
收稿日期: 2013-07-18
修回日期: 2013-08-15
网络出版日期: 2013-08-25
基金资助
国家自然科学基金（U1134101）；山东省自然科学基金（ZR2011EMM003）
Microstructure and Friction Wear Properties of Twin-roll Casting Magnesium Alloy AZ41
Received date: 2013-07-18
Revised date: 2013-08-15
Online published: 2013-08-25
Supported by
National Natural Science Foundation of China (U1134101); Natural Science Foundation of Shandong Province (ZR2011EMM003)
为研究铸轧镁合金AZ41板材的摩擦磨损性能，通过连铸连轧制备出镁合金AZ41板材，并观察其铸轧态和热处理态的微观组织结构特点。研究了滑动干摩擦条件下滑动速度和载荷对AZ41镁合金板材摩擦磨损性能的影响，采用扫描电镜观察磨损表面形貌，探讨了其磨损机制，并利用有限元方法模拟了其磨损时的应力分布。结果表明：制备的镁合金AZ41在（1012）上出现了大量压缩孪晶，经热处理后晶粒变为等轴晶；摩擦系数随着转速的增加而升高，在一定范围内随载荷的增加而降低；磨损量随着载荷和转速的增加而增加，低载时磨损机制为磨粒磨损，伴有氧化磨损的发生，高载时其磨损以粘着磨损为主。
宋令慧 , 王守仁 , 赵宰炯 . 连铸连轧镁合金AZ41微观结构与摩擦磨损性能[J]. 航空学报, 2014 , 35(6) : 1733 -1739 . DOI: 10.7527/S1000-6893.2013.0367
In order to analyze the friction wear properties of casting magnesium alloy AZ41 sheet, a twin-roll casting method is used for preparing a magnesium alloy AZ41 sheet, and the microstructure of the AZ41 sheet under the condition of twin-roll casting and heat-treatment are observed respectively. The effects of sliding speeds and loads on its friction wear properties are studied by a dry sliding friction test, and the worn surface morphologies are observed by an SEM in order to reveal its wear mechanism. Finally, the stress distribution during the friction wear processes is simulated by finite element analysis method. The results show that there is a large quantity of compression twin crystals in (1012) of the prepared materials and these crystals turn into equiaxed grains after heat-treatment; friction coefficient of the material gradually increases with the increase of the speed, and within a certain range of the load, the friction coefficient is reduced with the increase of the load. Wear weight loss increases with increasing load and speed, and the wear mechanism of the material is abrasive wear in low loads, which is accompanied by oxidation wear, but with high loads the main mechanism is adhesive wear.
Key words： twin-roll casting; magnesium alloys; microstructure; friction wear; wear mechanism
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