摘要
将热力学因素和动力学因素对金属匀质形核过冷度的影响统一起来，建立了匀质形核的过冷度方程。结果表明：金属的匀质形核过冷度与金属的形核驱动力因子、体积及冷却速度有关．对同一金属来说，其匀质形核过冷度随液态金属体积的减小或冷却速度的增大而增大，当液态金属体积与冷却速度的比值减小到一临界值时，金属的匀质形核过冷度增大到其最大值；在液态金属体积与冷却速度的比值一定时。
By determining the comprehensive effect of thermodynamic and dynamics factors on the homogeneous nucleation undercooling of metal, a theoretical expression representing the homogeneous nucleation undercooling of metal has been worked out. It is shown that the homogeneous nucleation undercooling of metal depend on the dimensionless nucleation driving force coefficient、the melt cooling rate and melt volume;the homogeneous nucleation undercooling of metal increases with the increasing of the metal cooling rate or the decreasing of the metal; when the ratio of the metal volume to the metal cooling rate decreases beyond a critical value, the homogeneous nucleation undercooling of metal will increase to its maximum value; the homogeneous nucleation undercooling of metal increases with the increasing of the metal dimensionless nucleation driving force coefficient in the condition that the ratio of the metal volume to the metal cooling rate is constant.
出处
《西安工业学院学报》
1999年第3期229-232,共4页
Journal of Xi'an Institute of Technology
基金
国家自然科学基金
关键词
过冷度
匀质形核
冷却速度
金属
热力学
undercooling
homogeneous nucleation
volume
cooling rate
