介观尺度下液相烧结过程的数值模拟研究进展

doi:10.11896/cldb.18090003

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Abstract Liquid phasesintering (LPS) is a key technology in powder metallurgy for manufacturing high performance materials.LPS provides an innovative and efficient way for manufacturing nearly fully dense components made of refractory alloys, hard alloys, cermets, etc.The microstructure evolution and densification during LPS directly determine the mechanical properties and dimensional accuracy of the part. Numerical simulation at the mesoscopic/grain scale offers direct insights into the microstructure evolution of the sintered body, and also deals with complex densification mechanisms and their interplays. Hence, numerical simulations of LPS in the mesoscopic scale have gained enormous attentions inrecent years.
LPS,involving grain growth and motion, solid-liquid transition and multi-phase flow, etc., presents a great challenge to the numerical simulation and its further applicationin industry. One common way, performing the numerical simulation of LPS, is based on a general assumption that LPS could be resolved into the three stages of grain rearrangement, grain dissolution/precipitation, and skeleton formation. Therefore, each stage of LPS is independently studied for simplification to still reveal some of the microstructure evolution mechanisms and affecting factors. In all the regarding findings, those on grain rearrangement and grain dissolution/precipitation are most fruitful.For grain rearrangement, studies were carried out based on the discrete element method, the liquid bridge coalescence model, etc. During rearrangement, the displacement of each particle was simulated in the viscous liquid under various forces, including inter-particle collision force, sliding force, sintering force and capillary force, etc. In these simulations, the grain motion, pore evolution and densification during grain rearrangement were usually described ignoring the grain growth and coarsening mechanisms. Phase field method and Monte-Carlo method were often adopted to simulate the grain dissolution/precipitation stage, which was treated as the classic Ostwald ripening. Large-scale three-dimensional simulations carried out by phase field method and Monte-Carlo method provided the particle size distribution and the growth kinetics very identical to the experimental observations. However, the simulations focusing on each independent stage is not applicable to describe the whole LPS process and the mechanisms under the experimental conditions, since the ranges overlapped for the three stages of LPS. Recently, the coupling strategies were presented to simulate LPS involving the liquid flow, grain rearrangement and grain growth simultaneously. The quantitative results of microstructure evolution and the sintering kinetics were successfully achieved by several coupled models for LPS, and the results showed higher accuracy than the models simulating only one stage. However, efficient numerical solutions for the three-dimensional simulations and experimental validations are required to promote the industry application of coupled simulations in the future.
This paper reviews the recent developments in numerical modeling of LPS in the mesoscopic/grain scale.The reliabilities, accuracies, advantages and disadvantages of each model/method for describing liquid redistribution pore evolution, grain growth and densification are compared and evaluated. Some advice about the future developments of the numerical simulation for LPS is thus given.

Key words： liquid phase sintering numerical simulation powder metallurgy mesoscopic scale coupling model

Published: 23 July 2019

CLC number:

TB303

Fund:This work was financially supported by the National Natural Science Foundation of China (51501091, 51371099) and Jiangsu Specially-Appointed Professor Program.

About author:: Wenjie Dai received her B.S. degree in material science and engineering from Chongqing University in 2013. She is currently pursuing her Ph.D. at the Department of Materials and Engineering, Nanjing University of Science and Technology under the supervision of Prof. Cang Fan and Shiyan Pan. Her research has focused on quantitative modelingof the liquid phase sintering based on phase field method.
Shiyan Pan received his Ph.D. degree in materials science from Dong Nan Universityin 2013. He then started his research work in Nanjing University of Science and Engineering since 2015. His research interests are the field of phase field simulations of alloy solidification. He has published 20 SCI and 25 EI papers in excellent journals including Acta Materialia, Scripta Materialia, Scientific Reports, Computational Materials Science, Calphad, ISIJ International, Intermetallics, etc.

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Cite this article:

DAI Wenjie,PAN Shiyan,SHEN Xiaoping, et al. Research Progress on the Numerical Simulation of Liquid Phase Sintering in the Mesoscopic Scale[J]. Materials Reports, 2019, 33(17): 2929-2938.

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http://www.mater-rep.com/EN/10.11896/cldb.18090003 OR http://www.mater-rep.com/EN/Y2019/V33/I17/2929

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