上海交通大学：《材料加工原理 Principles of Materials Processing》教学资源（课件讲稿）凝固和铸造 Solidification and casting_Solidification of single phase alloys（1）

先进材料疑固实验室 Laboratory of Advanced Materials Solidification 1896 1920 1987 2006 Solidification of single phase alloys(1) Dr.Mingxu Xia anced Mat 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITY

1896 1920 1987 2006 Solidification of single phase alloys (1) 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.Kurz,凝固原理 ©介万奇，凝固技术 A0V800 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

先进材料疑固实验室 OUTLINE Laboratory of Advanced Materials Solidification Solute Redistribution Solute distribution coefficient e Solute redistribution in equilibrium state Solute redistribution in non-equilibrium state Solute distribution in front of S/L interface Application:Zone melting Morphology Instability of a S/L interface Constitutional undercooling Morphological instability of a S/L interface Interface instability of pure metal Solidification microstructure:Cells and dendrites nced Ma 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITY

OUTLINE Solute Redistribution • Solute distribution coefficient • Solute redistribution in equilibrium state • Solute redistribution in non-equilibrium state • Solute distribution in front of S/L interface • Application: Zone melting Morphology Instability of a S/L interface • Constitutional undercooling • Morphological instability of a S/L interface • Interface instability of pure metal • Solidification microstructure: Cells and dendrites

先进材料疑固实验室 Single phase alloys Laboratory of Advanced Materials Solidification Definition of single phase alloy What is a single phase alloy? An alloy which consists of one phase in both liquid state and solid state. In the physical sciences,a phase is a region of space(a thermodynamic system),throughout which all physical properties of a material are essentially uniform. nced Ma 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITY

Single phase alloys Definition of single phase alloy What is a single phase alloy? An alloy which consists of one phase in both liquid state and solid state. In the physical sciences, a phase is a region of space (a thermodynamic system), throughout which all physical properties of a material are essentially uniform

先进材料疑固实验室 Review Laboratory of Advanced Materials Solidification Solidification mode: -Layer by layer -Mushy freezing -Mixed type a b d 1mm 上浒充通大 SHANGHAI JIAO TONG UNIVERSITY

Review Solidification mode: Layer by layer Mushy freezing Mixed type