Mg97Zn1Y2合金的摩擦磨损性能研究

Investigation of Friction and Wear Behavior of Mg97Zn1Y2 Alloy

摘要:

研究了铸态Mg97Zn1Y2合金的室温、高温力学性能和干摩擦条件下摩擦磨损行为，并与AZ91合金进行了对比。结果表明：室温下AZ91合金的屈服强度要高于Mg97Zn1Y2合金，但高温下Mg97Zn1Y2合金较AZ91合金表现出更好的热强性，当温度超过150 ℃时，AZ91合金的屈服强度急剧下降，Mg97Zn1Y2合金则下降较少。Mg97Zn1Y2合金由轻微磨损向严重磨损的转变点明显滞后于AZ91合金，相同载荷范围内Mg97Zn1Y2合金磨损表面的温升要低于AZ91合金，其原因是Mg97Zn1Y2合金中的金

Abstract:

The mechanical properties at room and elevated temperature as well as the friction wear behavior under dry sliding condition for as-cast Mg97Zn1Y2 alloy were investigated, and compared with that of AZ91 alloy. The results show that the yield strength of AZ91 alloy is higher than that of Mg97Zn1Y2 alloy at room temperature, but Mg97Zn1Y2 alloy exhibits better thermal stability at the evaluated temperature; as the temperature is above 150 ℃, the yield strength of AZ91 alloy decreases sharply, but that of Mg97Zn1Y2 alloy decreases a little. The transition point from mild wear to severe wear for Mg97Zn1Y2 alloy obviously lags that of AZ91 alloy. In the same load range, the bulk temperature rise of wear surface of the Mg97Zn1Y2 alloy is also lower than that of AZ91 alloy. The reason is that the intermetallic compound Mg12YZn in Mg97Zn1Y2 alloy possesses better thermal stability than Mg17Al12 phase in AZ91 alloy.