A two-dimensional Monte Carlo model for pore densification in a bi-crystal via grain boundary diffusion: Effect of diffusion rate,initial pore distance,temperature, boundary energy and number of pores |
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| Affiliation: | 1. National Laboratory of Solid State Microstructures, Department of Materials Science and Engineering, College of Engineering and Applied Science & Jiangsu Key Laboratory of Artificial Functional Materials & Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, PR China;2. Department of Basic Courses, Jinling Institute of Technology, Nanjing, 211169, PR China;1. School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;3. Gas Turbine Research Institute, Shanghai Jiao Tong University, Shanghai 200240, China;1. Safran Aircraft Engines, Rond-point René Ravaud, 77550 Moissy Cramayel, France;2. Univ. Grenoble Alpes, CNRS, Grenoble INP, SIMAP, 38000 Grenoble, France;1. Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 2R3, Canada;2. Weapons and Materials Research Directorate, Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA;1. School of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;2. Shanxi Key Laboratory of Precision Machining, The Shanxi Science and Technology Department, Taiyuan University of Technology, Taiyuan 030024, China |
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| Abstract: | A two-dimensional Monte Carlo (MC) model is introduced for simulating the evolution of the pore on a bi-crystal grain boundary via grain boundary diffusion. Simulated pore shrinkage kinetics is found to be consistent with previously reported results over variable grain boundary diffusion rates and initial pore distances while the essential characteristics of the microstructural evolution are simultaneously realized. The influence on the pore densification kinetics of grain boundary motion, boundary energy ratio, simulation temperature and pore interactions in an array is found such that pore shrinkage rate increases as the grain boundary motion, the simulation temperature and the grain boundary energy increase. The interactions of the pores are found to hinder the pore densification. The body of results signify that the more elongated the pore shape and the shaper the pore tip region are favored for the faster pore shrinkage kinetics during the simulated densification process via grain boundary diffusion. |
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| Keywords: | Monte Carlo simulation Pore densification Grain boundary diffusion Microstructural evolution Solid state sintering |
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