Mg-Li-Al合金的力学性能和阻尼性能
来源期刊:中国有色金属学报2000年第z1期
论文作者:马春江 张荻 覃继宁 丁文江
文章页码:10 - 14
关键词:Mg-Li-Al合金; 力学性能; 阻尼
Key words:Mg-Li-Al alloy; mechanical properties; damping
摘 要:研究了不同锂含量的Mg-Li-Al合金的力学性能和阻尼性能。结果表明 ,随锂含量的增加 ,Mg-Li-Al合金的密度和抗拉强度降低、塑性明显提高 ;而Mg-Li-Al合金的阻尼性能随锂含量的增多和温度的提高而明显增高 ,其中Mg-8Li-1Al合金的室温延伸率为 35% ,室温阻尼性能高达 0.01。Mg-8Li-1Al合金的阻尼明显大于Mg-4Li-1Al合金的阻尼 ,是由于Mg-8Li-1Al合金具有α+β双相共晶混合组织 ,α和β相的相界面在循环载荷下产生微滑移 ,而形成相界阻尼 ;而Mg-4Li-1Al合金中只存在α单相组织。
Abstract: The mechanical properties and the damping capacity of Mg-Li-Al alloys with different content of lithium were studied. The results showed that the tensile strength and densities of Mg-Li-Al alloys decrease with increasing lithium, while the ductility increases apparently; the damping capacity of Mg-Li-Al alloys increases with the rises in temperature and lithium content. For Mg8Li1Al alloy, the damping capacity can go up to 0.01. The higher damping capacity of Mg-8Li-1Al alloy may contribute to the interface damping between α(Mg) and β(Li) phases.