火花等离子烧结金属致密化的多物理场模拟和实验研究,Advanced Engineering Materials

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火花等离子烧结金属致密化的多物理场模拟和实验研究
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2023-08-09 , DOI: 10.1002/adem.202300764
A.S. Semenov ₁ , J. Trapp _{2,

3} , M. Nöthe ₂ , B. Kieback ₂ , T. Wallmersperger ₁

Affiliation

对金属粉末的放电等离子烧结过程进行了多变量实验研究和多物理场微观结构建模，相对密度高达约 80%。相比之下，在实验室规模的试验中测量了烧结温度、压力和颗粒尺寸对铜和镍颗粒圆柱形样品的颗粒间接触面积增长和轴向收缩的影响。在此，首次同时考虑所有与烧结现象相关的问题：放电等离子体烧结过程的完全耦合热机电建模，另外还考虑了晶格、晶界、表面扩散、电迁移和热迁移，已进行。对各种物理现象的计算分析可以识别主要和不重要的机制。两级数值模拟包括宏观层面的烧结装置建模和微观层面的颗粒链系统颈形成过程的建模。数值模拟结果与实验数据非常吻合。因此，通过有限元模拟研究了电气和机械载荷以及颗粒尺寸对微观温度分布、非弹性应变和致密化的影响。

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Multiphysics Simulation and Experimental Investigation of the Densification of Metals by Spark Plasma Sintering

Multivariant experimental investigations and multiphysics microstructural modeling of the spark plasma sintering process of metallic powders have been performed up to a relative density of approximately 80%. In comparison, the effect of sintering temperature, pressure, and particle size on the interparticle contact area growth and axial shrinkage of cylindrical specimens of copper and nickel particles is measured in laboratory scaled tests. Herein, for the first time all relevant for sintering phenomena are considered simultaneously: the fully coupled thermo-electro-mechanical modeling of the spark plasma sintering processes, additionally taking into account for lattice, grain boundary, surface diffusion, electromigration, and thermomigration, has been carried out. The computational analysis of various physical phenomena allows to identify dominant and insignificant mechanisms. The two-level numerical simulation includes the modeling of the sintering setup at the macroscopic level and the neck formation process in particle chain systems at the microscopic level. The results of the numerical simulations show a very good agreement with the experimental data. Therefore, the impact of electrical and mechanical loads as well as of particle size on microscopic distribution of temperature, inelastic strain, and on densification has been studied by the finite element simulations.

更新日期：2023-08-09

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