挤压态和压铸态AZ91镁合金的摩擦磨损行为

以挤压态和压铸态AZ91镁合金为对象，研究其在干摩擦条件下的摩擦磨损行为，分析两种成形工艺对AZ91镁合金摩擦磨损性能的影响，并探讨其磨损机制。研究表明:随着载荷增加，两种镁合金的摩擦因数均减小，而磨损量增加；随着转速提高，两种镁合金的摩擦因数均减小，而磨损量增大；在相同磨损条件下，挤压态AZ91镁合金的摩擦因数和磨损量均低于压铸态AZ91镁合金；挤压态AZ91镁合金和压铸态AZ91镁合金在干滑动摩擦条件下具有相同的磨损机制，50 N载荷加载下的磨损机制主要为磨粒磨损和氧化磨损，100 N载荷加载下的磨损机制主要为轻微剥层磨损、黏着磨损和氧化磨损，150 N载荷加载下的磨损机制为剥层磨损、氧化磨损和黏着磨损。

Research on the Friction and Wear Behavior of AZ91 Magnesium Alloy of Squeezing State and Die Casting State

The friction and wear characteristics of AZ91 magnesium alloy formed by extruding and pressure casting were studied. The effects of different forming technologies on the friction and wear characteristics of AZ91 magnesium alloy were analyzed and the wear mechanisms were discussed. The experimental results show that the friction coefficient of extruded and pressure casted AZ91 magnesium alloy decreases, while the mass loss increases with the increasing of the load and rotation rate. Under the same wearing condition, the friction coefficient and mass loss of extruded AZ91 magnesium alloy are lower than that of pressure casted AZ91 magnesium alloy. The extruded and pressure casted AZ91 magnesium alloy possess the same wearing mechanism with dry slithering friction. The wearing mechanisms of extruded and pressure casted AZ91 magnesium alloy chang with the increase of the load. When the load is equal to 50N, the wearing mechanisms are abrasive wear and oxidation wear. When the load increases to 100N, the wearing mechanisms change to light delamination wear, adhesion wear and oxidation wear. With the increase of the load to 150N, the wearing mechanisms are severe delamination wear, oxidation wear and adhesion wear.