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为克服传统三维多晶体晶粒正常长大基本理论的缺陷,以棱边或角隅迁移带动晶界迁移的方式推导出了新的晶粒长大关系式.以凯尔文十四面体为晶粒的基本形状,分析了多晶体晶粒长大时棱边及角隅密度的变化规律及其对晶粒长大速度和迁移激活焓的影响.以实验Fe-3%Si合金为例,用新关系式对其晶粒长大过程进行了模拟计算.结果显示,棱边或角隅迁移带动晶界迁移所反映出的规律,尤其是角隅迁移,更接近真实晶粒的长大过程,传统关系式中的缺陷得到明显改进,所推算激活焓的变化趋势也与实际观察相符.新关系式尚未能考虑金属三维多晶体中第二相粒子及溶质原子的作用,因此与实际观察结果尚存差异,有待进一步完善.
In order to overcome the defect of the basic theory of the normal three-dimensional polycrystal grains growing normally, a new grain growth relation was deduced by the way that the edge or corner migration drives the grain boundary migration.The Kelvin fourteen tetrahedron is The change of edge and corner density of polycrystalline grains as well as their influence on the growth speed and enthalpy of migration were analyzed.With the experimental Fe-3% Si alloy as an example, The new relationship is used to simulate the grain growth process. The results show that the law of grain boundary migration caused by the edge or corner migration, especially the corner migration, is closer to the growth of the real grain , The defects in the traditional relationship have been significantly improved, and the trend of the calculated activation enthalpy also agrees with the actual observation.The new relationship has not been able to consider the role of the second phase particles and solute atoms in the metal three-dimensional polycrystal, therefore, compared with the actual observation There are still some differences in the results that need to be further improved.