先进材料疑固实验室 Laboratory of Advanced Materials Solidification 1896 1920 1987 2006 Solidification of multi phase alloys(2) Dr.Mingxu Xia anced Mate 国 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITY
1896 1920 1987 2006 Solidification of multi phase alloys (2) Dr. Mingxu Xia
先进材料疑固实验室 References Laboratory of Advanced Materials Solidification M.C.Flemings,凝固过程 W.Kuz,凝固原理 介万奇，凝固技术 JA Dantzig,M.Rappaz,Solidification tory of vanced Materials Solid 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITY
References M.C.Flemings, 凝固过程 W.Kurz,凝固原理 介万奇，凝固技术 JA Dantzig, M. Rappaz, Solidification
先进材料疑固实验室 OUTLINE Laboratory of Advanced Materials Solidification Solidification of Eutectics Coupled eutectic growth morphology Other eutectic morphologies Jackson-Hunt model for Regular eutectics Morphology control method for regular eutectics Model for irregular eutectics Competitive growth of eutectic and dendritic phases Coupled zone in binary alloy phase diagram Solidification of Peritectics Microstructure control through solidification method Solidification Defects 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITY
OUTLINE Solidification of Eutectics • Coupled eutectic growth morphology • Other eutectic morphologies • Jackson-Hunt model for Regular eutectics • Morphology control method for regular eutectics • Model for irregular eutectics • Competitive growth of eutectic and dendritic phases • Coupled zone in binary alloy phase diagram Solidification of Peritectics Microstructure control through solidification method Solidification Defects
先进材料疑固实验室 J-H model for regular eutectic Laboratory of Advanced Materials Solidification T △G △Ca △C Co 1-k3(1-Ca (a) 1-(1-C0/ko3 Co/koo a a Co Flux of B 1-C ko3 C (b) (c) Fig.9.4(a)A linearized eutectic phase diagram.Schematic diagrams showing the steady-state solute field in the liquid ahead of(b)two independent o and B planar fronts,and (c)two lamellae a and B growing in a coupled manner. 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITY
J-H model for regular eutectic
先进材料疑固实验室 J-H model for regular eutectic Laboratory of Advanced Materials Solidification Cu T CE 个 0 AT CLa B (a) Crystal growth direction A 2S BL.-CB Sa+Sg=λ/2 (b) 25。 2S。+S) B atoms diffuse'along the S/L (0 interface in X direction from the front of a phase to the front of B (c)solute concentration in the liquid in the initial state phase,A atoms diffuse in the without diffusion,(d)solute concentration distribution at opposite direction the S/L interface(z=0),(e)solute concentration distribution at distance z=0.2(S+S)from the S/L The figure is from徐洲，姚寿山主编， interface,(f))solute concentration distribution at 《材料加工原理》科技出版社，2003.p80 distance z>(S+Sg)from the S/L interface A SHANGHAI JIAO TONG UNIVERSITY
J-H model for regular eutectic (c) solute concentration in the liquid in the initial state without diffusion, (d) solute concentration distribution at the S/L interface (z=0), (e) solute concentration distribution at distance z=0.2(Sα + Sβ) from the S/L interface, (f) ) solute concentration distribution at distance z>(Sα + Sβ) from the S/L interface. The figure is from 徐洲, 姚寿山主编, 《材料加工原理》科技出版社, 2003. p80 y z z Sα + Sβ=λ/2