吉大材料考研课件全英语版chapter

Chapter6

Diffusion第六章扩散吉林大学材料科学与工程学院曹占义2023/3/27Chapter6Diffusion26.1INTRODUCTIONdiffusion:Masstransportbyatomicmotion.Interdiffusion(orimpuritydiffusion):

Diffusionofatomsofonemetalintoanothermetal.Self-diffusion:Atomicmigrationinpuremetal.扩散异(互)扩散自扩散2023/3/27Chapter6Diffusion36.1INTRODUCTIONInterdiffusionofCu-Nicouple:

铜镍的异(互)扩散2023/3/27Chapter6Diffusion46.2DIFFUSIONMECHANISMSVACANCYDIFFUSION.INTERSTITIALDIFFUSION.

空位扩散间隙原子扩散2023/3/27Chapter6Diffusion56.3STEADY-STATEDIFFUSIONdiffusionflux(J)微分形式steady-statediffusion2023/3/27Chapter6Diffusion66.3STEADY-STATEDIFFUSIONFick’sfirstlaw菲克第一扩散定律Diffusioncoefficient,DDrivingforce扩散系数，稳态扩散时的扩散速度（扩散）驱动力2023/3/27Chapter6Diffusion76.4NONSTEADY-STATEDIFFUSIONFick’ssecondlaw菲克第二扩散定律如果扩散系数不受成分影响，则：2023/3/27Chapter6Diffusion86.4NONSTEADY-STATEDIFFUSIONASolutionofFick’ssecondlawforasemi-infinitesolid菲克第二扩散定律boundaryconditionsHere:Equation6.52023/3/27Chapter6Diffusion96.4NONSTEADY-STATEDIFFUSIONASolutionofFick’ssecondlawforasemi-infinitesolid菲克第二扩散定律的应用Equation6.5C1D12023/3/27Chapter6Diffusion106.5FACTORSTHATINFLUENCEDIFFUSIONDIFFUSINGSPECIES:TEMPERATURE:

扩散(偶)种类温度2023/3/27Chapter6Diffusion116.6OTHERDIFFUSIONPATHS‘‘short-circuit’’diffusionpathsdislocations,grainboundaries,andexternalsurfaces2023/3/27Chapter6Diffusion126.7DIFFUSIONINIONICANDPOLYMERICMATERI