TY - JOUR
T1 - Influence of grain boundary energy on the grain size evolution in nanocrystalline materials
AU - Chen, Zheng
AU - Liu, Feng
AU - Yang, Wei
AU - Wang, Haifeng
AU - Yang, Gencang
AU - Zhou, Yaohe
PY - 2009/5/5
Y1 - 2009/5/5
N2 - Combining the empirical relation for grain boundary (GB) segregation upon isothermal grain growth and the generalized parabolic growth law, the influence of GB energy on the grain size evolution in nanocrystalline (NC) materials is studied, while the grain-size-dependent solute excess is given using Mclean's equation. Satisfactory agreement between model prediction and experimental data from NC growth of dense NC gadolinia-doped ceria [J.L.M. Rupp, A. Infortuna, L.J. Gauckler, Acta Mater. 54 (2006) 1721-1730] has been achieved. Solute excess in GBs increases with grain growth and then tends to its saturated value, therefore, the inhibition of grain growth can be attributed to the reduction of GB energy through solute segregation, whereas, the consumed annealing time before the stop of grain growth is mainly affected by GB mobility.
AB - Combining the empirical relation for grain boundary (GB) segregation upon isothermal grain growth and the generalized parabolic growth law, the influence of GB energy on the grain size evolution in nanocrystalline (NC) materials is studied, while the grain-size-dependent solute excess is given using Mclean's equation. Satisfactory agreement between model prediction and experimental data from NC growth of dense NC gadolinia-doped ceria [J.L.M. Rupp, A. Infortuna, L.J. Gauckler, Acta Mater. 54 (2006) 1721-1730] has been achieved. Solute excess in GBs increases with grain growth and then tends to its saturated value, therefore, the inhibition of grain growth can be attributed to the reduction of GB energy through solute segregation, whereas, the consumed annealing time before the stop of grain growth is mainly affected by GB mobility.
KW - Grain boundaries
KW - Nanostructured materials
KW - Solid state reactions
UR - http://www.scopus.com/inward/record.url?scp=63649122636&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2008.08.040
DO - 10.1016/j.jallcom.2008.08.040
M3 - 文章
AN - SCOPUS:63649122636
SN - 0925-8388
VL - 475
SP - 893
EP - 897
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
IS - 1-2
ER -