This paper deals with the technology of computer graphics and its application in ana-lyzing complex nonlinear proceas. We have investigated metal crystallization, which is a complexnonlinear process and is difficult t...This paper deals with the technology of computer graphics and its application in ana-lyzing complex nonlinear proceas. We have investigated metal crystallization, which is a complexnonlinear process and is difficult to analyze by using the conventional numerical rnethod to estab-lish a complete and accurate mathematical modcl. Based on the principles of metal crystallizationand Cellular Automata algorithm, the author separated, in time and space, the process ofccystailization into periodically growing airays, so that the simulation of metal crystallization isrealized.展开更多
A new numerical model is developed using a Cellular Automata (CA) method to study the liquid-phase dissolution behavior of gap-filler powder particles in interlayer powder mixture during transient liquid phase (TLP) b...A new numerical model is developed using a Cellular Automata (CA) method to study the liquid-phase dissolution behavior of gap-filler powder particles in interlayer powder mixture during transient liquid phase (TLP) bonding process. The model prediction of microstructural evolution in TLP joint between single crystal substrates show that formation of misoriented stray-grains results from incomplete liquation of the gap-filler powder particles. In contrast to what is generally assumed and reported, numerical calculations coupled with experimental verification show that under properly selected process parameters, complete melting of the gap-filler powder particles is possible. This is imperative to prevent the formation of misoriented stray-grains and maintain single crystallinity during TLP bonding of single crystal materials. The dependence of complete melting of the gap-filler particles on salient TLP bonding parameters are analyzed and discussed.展开更多
文摘This paper deals with the technology of computer graphics and its application in ana-lyzing complex nonlinear proceas. We have investigated metal crystallization, which is a complexnonlinear process and is difficult to analyze by using the conventional numerical rnethod to estab-lish a complete and accurate mathematical modcl. Based on the principles of metal crystallizationand Cellular Automata algorithm, the author separated, in time and space, the process ofccystailization into periodically growing airays, so that the simulation of metal crystallization isrealized.
文摘A new numerical model is developed using a Cellular Automata (CA) method to study the liquid-phase dissolution behavior of gap-filler powder particles in interlayer powder mixture during transient liquid phase (TLP) bonding process. The model prediction of microstructural evolution in TLP joint between single crystal substrates show that formation of misoriented stray-grains results from incomplete liquation of the gap-filler powder particles. In contrast to what is generally assumed and reported, numerical calculations coupled with experimental verification show that under properly selected process parameters, complete melting of the gap-filler powder particles is possible. This is imperative to prevent the formation of misoriented stray-grains and maintain single crystallinity during TLP bonding of single crystal materials. The dependence of complete melting of the gap-filler particles on salient TLP bonding parameters are analyzed and discussed.
基金Natural Science Foundation for Key Program( 50935007 ) Natural Science Foundation (50805121)+3 种基金 National Basic Research Program of China (2010CB731701)Foundation for Fundamental Research of Northwestern Polytechnical University in PR China (NPU-FFR-JC20100229)Research Fund of the State Key Laboratory of Solidification Processing of Northwestern Polytechnical University in PR China (27-TZ-2010 ) the 111 Project (B08040)
