Effect of CuO and SnO₂ particle size on hot extrusion deformation of AgCuOSnO₂: Finite element simulation and experimental study

Abstract

The finite element model is established according to the experimental results, and then the experimental results are verified by simulation calculation. In terms of the combination of finite element analysis and experiment, the effect of particle size of CuO and SnO₂ on the stress, strain and microstructure of AgCuOSnO₂ composite during hot extrusion was studied. The results illustrate that with the decrease of particle size, the dispersion of the second phase increases gradually, while the possibility of “tail shrinkage” of the billet decreases continuously; cubic CuO will evolve to fibrosis, and the degree of fibrosis will increase with the decrease of the particle size and ring clusters. Specifically, the degree of fibrosis at the middle end of the billet is higher than that at the front end, the degree of fibrosis at the front end is higher than that at the back end, and the degree of fibrosis on the surface is higher than that in the core; part of CuO fibers will bend, and the degree of buckling strength is positively correlated with the size of particles and their annular clusters. Additionally, there is fiber CuO in the front and back end of the billet that are inconsistent with the extrusion direction, and the degree of difference was negatively correlated with the particle size.

摘要

根据实验结果建立了有限元模型, 并通过模拟计算验证实验结果。通过有限元分析和实验相结 合, 研究了不同颗粒尺寸的CuO 和SnO₂ 在热挤压过程中, 对AgCuOSnO₂ 复合材料的应力、应变和 微观组织的影响。结果表明, 随着颗粒尺寸的减小, 第二相的分散性逐渐增加, 而坯料发生“缩尾”的 可能性则不断下降。立方CuO 将向纤维化演变, 其纤维化程度随着颗粒及其环状团簇尺寸的减小而 增加, 具体为坯料中端大于前端, 前端又大于后端, 表层强于芯部。CuO 纤维将发生弯曲, 屈曲度则 与颗粒及其环状团簇尺寸呈正相关。此外, 坯料前端和后端存在与挤压方向不一致的纤维CuO, 差异 程度与颗粒大小呈负相关。