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纳米晶体材料的很多性质与界面效应有关.从材料的微观结构特点出发,研究界面对材料的有效弹性性质的影响.首先,将纳米晶体材料看作一种两相复合材料,基体是具有不规则原子结构的界面相,夹杂是具有理想晶格的晶粒相,用Mori-Tanaka方法给出了有效模量的表达式.进而用应变梯度弹性理论,通过对纳米晶体材料的代表性胞元的分析,考察了应变梯度对材料变形行为的影响.分析了界面效应影响材料性质的两种微观物理机制,其一是界面相不规则原子结构的软化效应,其二是界面附近边界层存在引起的硬化效应.
Many properties of nanocrystalline materials are related to interface effects.Studying the effect of interface on the effective elastic properties of materials from the microstructural characteristics of nanocomposites.Firstly, nanocrystalline materials are considered as two-phase composites with irregular Atomic structure of the interphase, inclusions is the grain phase with the ideal lattice, Mori-Tanaka method is used to give the effective modulus of expression. And then use the strain gradient elasticity theory, the representative of the nanocrystalline material cells The effects of interface effect on the properties of materials are analyzed. One is the softening effect of the irregular atomic structure of the interface phase, and the other is the existence of the boundary layer near the interface Hardening effect.