High-temperature friction of Al-Zn-Mg alloy

The Al-Zn-Mg series aluminum alloy was subjected to several ball-on-disc tests at 25~500 ℃ and different normal loads of 1~5 N. The changes in the friction coefficient of the Al-Zn-Mg alloy, the morphology and composition characteristics of the worn surface and subsurface layer at different test temperatures and normal loads were analyzed, and the effects of the test temperature and normal load on the friction behavior of the Al-Zn-Mg alloy were studied. The results showed that when the normal load was 5 N at 25~500 ℃, the friction coefficient increased with increasing temperature, and the content of oxygen on the worn surface gradually increased. The wear mechanism changed gradually from abrasive wear to adhesive wear and oxidation wear. When the temperature was 500 ℃ and the load increased from 1 N to 5 N, the friction coefficient of the aluminum alloy increased sharply, the volume of wear debris on the worn surface and the depth of the spalling layer increased, and finally, a thicker oxide friction layer gradually appeared. During the high-temperature sliding process, the oxide particles formed by the crushing of the MML formed three-body friction at the friction interface, which aggravated the wear.