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.