摘要
基于单个晶粒生长所形成的成分过冷为邻近的形核颗粒提供形核所需成分过冷的假设,提出晶粒细化的相关晶粒尺寸(RGS)判据。0.03%TiB2细化不同含钛量的铝合金的试验数据拟和出的形核过冷度与试验测量结果较一致。分析发现成分过冷区初期其形成的速率正比于抑制生长因子Q,成分过冷参数P可作为柱状晶向等轴晶转变的判据。对于使用强形核颗粒合金的晶粒尺寸可用直接使用抑制生长因子Q来衡量,而弱形核颗粒使用RGS可能更准确一些。
The criterion of relative grain size (RGS) is developed based on the assumption that adjacent nucleating particles are activated by constitutional undercooling generated by growth of grain. The experimental data about the refinement of 0.03%TiB_2 coincide with the model prediction. The initial rate of development of constitutional undercooling is showed to be proportional to the growth restriction factor Q . The supercoolingg parameter P an be regard as the determination of CET(a columnar to equiaxed transition). The Q can be used directly as a refine criterion in potent nucleating particles alloy, but in weak uncleating partids,the use of RGS would be more rate.
出处
《河南科技大学学报（自然科学版）》
CAS
2004年第1期9-13,共5页
Journal of Henan University of Science And Technology:Natural Science
基金
河南省科技攻关资助项目(971110305)
