凝固过程中生长界面前沿质点的排斥过程研究

• 作 者: 毛协民 温宏权
• 机 构: School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China
• 出 处: 上海大学学报(英文版)
• 发表日期: 2002年3期
• 关键词: particle pushing criterion composite materials

For in-situ composite materials, the interaction between the second-phase particles and the solidification interface attracts more attentions of people, for concerning the final distribution of the particles on the matrix. With the conception of the local solidification time, a kinematics mechanism of particle pushing into the crystal boundary during the solidification process was assumed.Through the analysis of forces acted on the particle in front of the solid/liquid interface the critical velocity criterion for the particles pushing was given. The calculation results show when the growth rate of the interface V is less than or equals to the critical velocity Vc. the particles on the solid/liquid interface is pushed into the boundary region of cellular crystals, where they are distributed as a chain-like straight, which forms a particle-strengthened in-situ composite materials.