一维六方准晶复合材料界面层中螺型位错分析  

Elastic Analysis of a Screw Dislocation in an Interfacial Layer in 1DHexagonal Quasicrystal Composites

作　　者：肖万伸[1] 张春雨[1] 邹伟生[1] 

机构地区：[1]湖南大学机械与运载工程学院,湖南长沙410082

出　　处：《材料科学与工程学报》2014年第2期215-218,205,共5页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51079054)

摘　　要：本文研究了一维六方准晶复合材料夹杂界面层中螺型位错与夹杂以及无限大基体的干涉效应。运用复变函数方法,得了该问题的解析解答,所得退化结果与已有文献结果一致,并得到了作用在圆环形界面层中螺型位错的位错力的精确表达式。讨论了一维六方准晶材料弹性常数对位错运动以及位错力的影响规律。结果表明,一维六方准晶中的材料弹性常数对位错力的变化影响是显著的。随着相位子场弹性常数或者声子场-相位子场耦合弹性常数的增大,其相应区域对位错的排斥或者吸引作用也分别增强。在夹杂界面或者基体界面附近,随着相位子场弹性常数和声子场-相位子场耦合弹性常数同时增大,夹杂或者基体对位错的吸引作用增强,但是并不改变位错平衡点的位置。For 1Dhexagonal quasicrystal composites,research is conducted in terms of the interactions among a screw dislocation situated in the interfacial layer,a circular inhomogeneous inclusion and the infinity matrix.An analytical solution to this problem is obtained by means of complex potential method.The degradation results are consistent with the conclusions in previous literatures.Explicit expression of the image force acting on the screw dislocation in the annular interfacial layer is established consequently.The influence of the elastic constants of material on the image force with motion is further discussed.The results show that the elastic constants have an obvious impact on the image force and motion of the dislocation.The action of inhomogeneity or matrix on the dislocation attraction or repel increases with the increase of the elastic constant of the phason field or the phonon-phason coupling elastic constant.Near the inhomogeneity or matrix,its attraction increases with the increase of the elastic constants of the phason field and the phonon-phason coupling elastic constant,but does not change the position of the dislocation equilibrium point.

关 键 词：准晶 夹杂界面层 复变函数方法 螺型位错 位错力 

分 类 号：O346.1[理学—固体力学]