Mg-Li合金及复合材料的抗蠕变性能  

Creep Resistance of Mg-Li Alloy and Its Composites

作　　者：于化顺[1] 高瑞兰[1] 闵光辉[1] 王执福[1] 陈熙琛[2] 

机构地区：[1]山东大学 [2]中国科学院物理研究所

出　　处：《特种铸造及有色合金》2002年第1期8-9,共2页Special Casting & Nonferrous Alloys

摘　　要：对Mg Li合金及液态反应合成MgO/Mg2 Si颗粒增强Mg Li基复合材料的室温和高温抗蠕变性能进行了研究。结果表明 ,复合材料的抗蠕变性能明显高于基体合金 ,室温时的蠕变速度仅为基体合金的 1/10 ,且随温度的升高效果更明显 ,160℃时的蠕变速度约为基体合金的 2 %。其机理为颗粒的存在提高了材料的屈服强度和弹性模量 ,以及颗粒限制晶界的相对滑动、阻碍位错的滑移及攀移。Creep resistances of Mg-Li alloy and MgO/Mg\-2Si particulate reinforced Mg-Li matrix composite prepared by reaction synthesis in liquid at room and elevated temperatures were studied. The results showed that the creep resistance of the composite is significantly higher than that of the matrix alloy and the effect is better with the increase of temperature. The creep rate of the composite is 10% and 2% of matrix alloy at room temperature and 160℃. The mechanism could be attributed to the increase of the yield stress and Young' s modulus of composite by MgO/Mg2Si particulate, to the restriction of relative sliding of grain boundary, to the block of dislocation movement, and to the reduction of diffusion rate of atoms and vacancies.

关 键 词：MG-LI合金 复合材料 抗蠕变性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]