高温和低应力引起的晶界成分的改变

The Crystal Ingredient Transform Caused by High Temperature and Low Tenside Stress

推导出了材料在高温和不能引起范性蠕变的弹性范围内张应力作用引起的溶质非平衡晶界偏聚的动力学方程 .模拟了Shinoda和Nakamura的磷在钢中和Misra的硫在钢中的张应力时效实验结果 ,获得了模拟结果与实验结果的一致 .通过模拟发现 ,张应力使磷 -空位复合体以及硫 -空位复合体在钢中的扩散系数均增加 3个数量级 ,使磷原子和硫原子的扩散系数分别降低 3个和 5个数量级 .

A set of kinetic equations is derived to formulate the process of non-equilibrium grain boundary segregation of solute induced by a low tensile stress.With these kinetic equations an excellent simulation can be reached for the observations of grain boundary segregations of P and S in steels under low tensile stresses.The results of simulation justify the model and the present kinetic equations.It also shows that the applied tensile stress can increase the diffusive rate of the solute-vacancy complexes and d...