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清华大学材料科学基础授课教案第六章
材料科学基础Fundamental of Materials;§6.7 Reaction Diffusion (Diffusion in Multiple Phase Zone);;There have no two-phases area in diffusion area, every layer is single-phases.
Phase’s interface moves according to parabola law.
Phase’s width ;Ⅱ.Basic features:
Diffusion is accompanied by reaction or phase transformation. In general, diffusion is rate-determining step while reaction take place instantaneously.
For diffusion in binary systems there appear only a series of single phase, one adjacent to another, while mixed phase zone doesn’t appear.
Concentrating changes abruptly at phase boundary.
The phase boundaries and the width of each phase change parabolic ally with time.;3. Rule of phase appearing;Ⅳ.Discussion
Phases that can appear
Growth law: in general in special cases: ~ (1) is tenable in volume (lattice) diffusion;Examples and Discussions;2. F-C;Exercise;Thank you !
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