TY - GEN
T1 - Interface migration with segregation in MoSi2-based lamellar alloy simulated by phase-field method
AU - Yamazaki, Toshihiro
AU - Koizumi, Yuichiro
AU - Chiba, Akihiko
AU - Hagihara, Koji
AU - Nakano, Takayoshi
AU - Yuge, Koretaka
AU - Kishida, Kyosuke
AU - Inui, Haruyuki
PY - 2014
Y1 - 2014
N2 - MoSi2-based alloys are attracting attention as ultra-high temperature structural material for super-high efficiency gas turbine power generation systems. In this study, the effects of Cr- and Zr-addition on interface migration in MoSi2/NbSi2 lamellar silicide were examined by phase-field simulations employing the segregation energies evaluated by the first principles calculation in addition to thermodynamic free energy in order to take into account the chemically-driven interfacial segregation. The simulation results indicate that both Cr and Zr can segregate at the lamellar interface to suppress its migration, and the Zr-addition is more effective to lower the interface migration rate than the Cr-addition owing to its higher segregation energy.
AB - MoSi2-based alloys are attracting attention as ultra-high temperature structural material for super-high efficiency gas turbine power generation systems. In this study, the effects of Cr- and Zr-addition on interface migration in MoSi2/NbSi2 lamellar silicide were examined by phase-field simulations employing the segregation energies evaluated by the first principles calculation in addition to thermodynamic free energy in order to take into account the chemically-driven interfacial segregation. The simulation results indicate that both Cr and Zr can segregate at the lamellar interface to suppress its migration, and the Zr-addition is more effective to lower the interface migration rate than the Cr-addition owing to its higher segregation energy.
KW - Phase-field simulation
KW - Refractory material
KW - Silicide
UR - http://www.scopus.com/inward/record.url?scp=84901505556&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84901505556&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/AMR.922.832
DO - 10.4028/www.scientific.net/AMR.922.832
M3 - Conference contribution
AN - SCOPUS:84901505556
SN - 9783038350743
T3 - Advanced Materials Research
SP - 832
EP - 837
BT - THERMEC 2013 Supplement
PB - Trans Tech Publications Ltd
T2 - 8th International Conference on Processing and Manufacturing of Advanced Materials: Processing, Fabrication, Properties, Applications, THERMEC 2013
Y2 - 2 December 2013 through 6 December 2013
ER -