TiB2颗粒TiB晶须混杂增强铜基复合材料导电率有限元模拟

Simulation of electrical conductivity of (TiB2p+TiBw)/Cu composites

摘要:

本文建立了TiBw/Cu、(TiB2p+TiBw)/Cu、TiB2p /Cu复合材料的三维细观结构有限元模型，基于ABAQUS非耦合的热电分析理论，通过有限元数值模拟方法揭示了复合材料微观结构特征参量与宏观导电性能之间的定量关系。结果表明:TiB2颗粒体积分数为导电率主要影响因素，随体积分数增大导电率逐步减小，颗粒粒径大小对导电率影响不显著；TiB晶须体积分数和晶须取向角为导电率主要影响因素，晶须取向角平行于电流方向时导电率最好，垂直于电流方向时的导电率最差。在颗粒晶须混杂增强复合材料中，增强体体积分数和晶须取向角为导电率的主要影响因素，增强体种类对导电率影响较小。本文为颗粒晶须混杂增强铜基复合材料导电率计算提供了新的思路和方法，对颗粒和晶须增强复合材料混杂设计提供依据。

关键词:导电率;TiB2颗粒;TiB晶须;铜基复合材料;数值模拟

Abstract:

Three-dimensional meso-structural finite element models of TiBw/Cu, (TiB2p + TiBw)/Cu and TiB2p /Cu composites were built. Based on the Abaqus uncoupled thermoelectric analysis theory, the quantitative relationship between the microstructure characteristic parameters and the macroscopic electrical conductivity of the composites was revealed by simulation method.The results show that the volume fraction of TiB2 particles is the main factor affecting the electrical conductivity, and the electrical conductivity gradually decreases with the increase of the volume fraction,while the particle size has no significant effect on the electrical conductivity. The volume fraction and the orientation Angle of TiB whisker are the main factors affecting the electrical conductivity. When the whisker orientation Angle is parallel to the current direction, the electrical conductivity is the best, and when the whisker orientation Angle is perpendicular to the current direction, the electrical conductivity is the worst. In the (TiB2p+TiBw)/Cu composites,the volume fraction of the whisker and the whisker orientation Angle are the main factors affecting the electrical conductivity, and the type of the whisker has little effect on the conductivity.This paper provides a new idea and method for the electrical conductivity prediction of (TiB2p + TiBw)/Cu composites, and provides a basis for the hybrid design of the composite with particles and whiskers.

Key words:Electrical conductivity; TiB2 particles; TiB whisker; Copper matrix composites; simulation