TY - JOUR
T1 - Numerical simulation of microstructural evolution in isothermally-aged Cu-Ni based alloys
AU - Avila-Davila, E. O.
AU - Melo-Maximo, D. V.
AU - Gutierrez-Mendez, C.
AU - Saucedo-Muñoz, M. L.
AU - Lopez-Hirata, V. M.
PY - 2007
Y1 - 2007
N2 - The micro structure simulation of spinodal decomposition was carried out in the isothermally-aged Cu-Ni and Cu-Ni-Fe and Cu-Ni-Cr alloys using the phase field method. The numerical simulation was based on a solution of the Cahn-Hilliard partial differential equation by the finite difference method. The calculated results were compared to those determined by atom-probe field ion microscope analyses of the solution treated and aged alloys. Both the numerically simulated and experimental results showed a good agreement for the concentration profiles and micro structure in the aged Cu-Ni, Cu-Ni-Fe and Cu-Ni-Cr alloys. A very slow growth kinetics of phase decomposition was observed to occur in the aged Cu-Ni alloys. The morphology of decomposed phases consists of an irregular shape with no preferential alignment in any crystallographic direction at the early stages of aging in all the aged alloys. In the case of the aged Cu-Ni-Fe alloy, a further aging caused the change of initial morphology to an equiaxial shape of the decomposed Ni-rich phase aligned in the elastically-softest crystallographic direction 〈100〉 of Cu-rich matrix. The growth kinetics rates of phase decomposition in Cu-Ni-Fe and Cu-Ni-Cr alloys are appreciably faster than that in Cu-Ni alloys.
AB - The micro structure simulation of spinodal decomposition was carried out in the isothermally-aged Cu-Ni and Cu-Ni-Fe and Cu-Ni-Cr alloys using the phase field method. The numerical simulation was based on a solution of the Cahn-Hilliard partial differential equation by the finite difference method. The calculated results were compared to those determined by atom-probe field ion microscope analyses of the solution treated and aged alloys. Both the numerically simulated and experimental results showed a good agreement for the concentration profiles and micro structure in the aged Cu-Ni, Cu-Ni-Fe and Cu-Ni-Cr alloys. A very slow growth kinetics of phase decomposition was observed to occur in the aged Cu-Ni alloys. The morphology of decomposed phases consists of an irregular shape with no preferential alignment in any crystallographic direction at the early stages of aging in all the aged alloys. In the case of the aged Cu-Ni-Fe alloy, a further aging caused the change of initial morphology to an equiaxial shape of the decomposed Ni-rich phase aligned in the elastically-softest crystallographic direction 〈100〉 of Cu-rich matrix. The growth kinetics rates of phase decomposition in Cu-Ni-Fe and Cu-Ni-Cr alloys are appreciably faster than that in Cu-Ni alloys.
KW - Microstructural evolution
KW - Numerical simulation
KW - Spinodal decomposition and Cu-Ni based alloys
UR - http://www.scopus.com/inward/record.url?scp=57649087426&partnerID=8YFLogxK
M3 - Artículo de la conferencia
AN - SCOPUS:57649087426
SN - 1022-6680
VL - 15-17
SP - 672
EP - 677
JO - Advanced Materials Research
JF - Advanced Materials Research
T2 - 5th International Conference on Processing and Manufacturing of Advanced Materials - THERMEC 2006
Y2 - 4 July 2006 through 8 July 2006
ER -