Segregation of impurity to the grain boundary and interphase boundary in ultra-fine microstructure

超细显微组织中杂质向晶界和相间偏析

• 批准号: 07455271
• 负责人: ISHIDA Kiyohito
• 金额: $ 4.8万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07455271/
• 关键词: Grain boundary segregation; Grain size; Interface; Thermodynamics; Gain boundary; Impurity; Segregation energy

Theoretical and experimental study of the effect of grain size on the grain boundary segregation was made and the results obtained are as follows ;1.The equilibrium segregation of solute to the grain boundary can be described by the modified Mclean's equation :2.The grain size effect on the intergranular segregation is remarkable with higher segregation energies and lower bulk concentrations with decreasing temperature.3.When the segregation free energy of X is larger than that of Y in A-X-Y ternary alloy, the grain boundary concentration of X atom decreases with decreasing grain size, while that of Y atom depends on the bulk concentrations of solute.4.An experimental evidence of the grain size dependence of the intergranular segregation in Cu-0.0015at.%Bi alloy was obtained.5.The segregation energy of Bi in Cu was estimated to be about 62.5kJ/mol.6.It is suggested that the grain size has a significant role on the grain boundary segregation not only in the metallic system but also in ceramics.

对晶粒尺寸对晶界偏析的影响进行了理论和实验研究，得到的结果如下：1.溶质向晶界的平衡偏析可以用修正的Mclean方程描述：2.晶粒尺寸随着温度的降低，对晶间偏析的影响显着，具有较高的偏析能和较低的体积浓度。 3.当A-X-Y三元合金中X的偏析自由能大于Y的偏析自由能时，晶界浓度X原子的含量随着晶粒尺寸的减小而减小，而Y原子的含量则取决于溶质的体积浓度。4．获得了Cu-0.0015at.%Bi合金中晶间偏析与晶粒尺寸相关的实验证据。5． Bi在Cu中的偏析能估计约为62.5kJ/mol.6。这表明晶粒尺寸不仅对金属体系而且对陶瓷的晶界偏析都有重要作用。

项目成果

K.Ishida: "How the grain size affects the grain boundary segregation?" Current state on High Strength Steels, The Iron and Steel Institute. 87-92 (1995)

K.Ishida：“晶粒尺寸如何影响晶界偏析？”

K.Ishida: "Effect of Grain Size on Grain Boundary Segregation" J.Alloy & Compounds. (印刷中). (1996)

K.Ishida：“晶粒尺寸对晶界偏析的影响”J.Alloy &compounds（出版中）。

K.Ishida: "Effect of grain size on grain boundary segregation" Journal of Alloys and Compounds. 235. 244-249 (1996)

K.Ishida：“晶粒尺寸对晶界偏析的影响”合金与化合物杂志。