TY - JOUR
T1 - Nano-scale grain growth inhibited by reducing grain boundary energy through solute segregation
AU - Liu, Feng
AU - Kirchheim, Reiner
PY - 2004/3/15
Y1 - 2004/3/15
N2 - Combining Gibbs adsorption equation and McLean's grain boundary segregation model derives an empirical relation for isothermal grain growth. This relation predicts that driving grain boundary energy to zero is possible in alloy with high segregation energy. Then the grain boundary is in a thermodynamic equilibrium in the presence of solute atoms and, therefore, grain growth is stopped. On this basis reducing grain boundary energy through solute segregation inhibits nano-scale grain growth, and then metastable equilibrium can be reached with saturated grain boundaries. Exact values for solute excess of grain boundary available for segregation at saturation, Γ b0, Gibbs free energy change of grain boundary segregation pre mole solute, ΔGseg, and/or equilibrium grain diameter, D*, can be achieved by fits of this model to the experimental results.
AB - Combining Gibbs adsorption equation and McLean's grain boundary segregation model derives an empirical relation for isothermal grain growth. This relation predicts that driving grain boundary energy to zero is possible in alloy with high segregation energy. Then the grain boundary is in a thermodynamic equilibrium in the presence of solute atoms and, therefore, grain growth is stopped. On this basis reducing grain boundary energy through solute segregation inhibits nano-scale grain growth, and then metastable equilibrium can be reached with saturated grain boundaries. Exact values for solute excess of grain boundary available for segregation at saturation, Γ b0, Gibbs free energy change of grain boundary segregation pre mole solute, ΔGseg, and/or equilibrium grain diameter, D*, can be achieved by fits of this model to the experimental results.
KW - A1. Segregation
KW - A1. Solid solutions
KW - B1. Nano-materials
UR - http://www.scopus.com/inward/record.url?scp=1342346334&partnerID=8YFLogxK
U2 - 10.1016/j.jcrysgro.2003.12.021
DO - 10.1016/j.jcrysgro.2003.12.021
M3 - 文章
AN - SCOPUS:1342346334
SN - 0022-0248
VL - 264
SP - 385
EP - 391
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
IS - 1-3
ER -