✍ Scribed by A.F Brown; D.A Blackburn
No coin nor oath required. For personal study only.
Several laboratories have reported that diffusivities (D,) measured in systems undergoing plastic strain at constant rate (9) are many times larger than diffusivities (D,,) measured in static systems and that (D,/D,J = 1 + K.5 Other laboratories experimenting under apparently similar conditions have failed to find any enhancement at all. It is suggested that the apparent enhancements and the observed law, are a direct result of thr use of diffusion penetrations (2dDt) too small for the resolution of the various methods of analysis. -4UGMENTATION APPARENTE DES COEFFICIENTS DE DIFFUSION DASS LES ME TAUX DEFORMES PLASTIQUEMENT Plusieurs laboratoires ant, signal6 que les coefficients de diffusion (D,) mesur& dans le cas de sy&mes soumis it une dkformation plastique B vitesse constante (.6), sont nettement plus grands que les coefficients de diffusion (D,) mesur& SW des systemes statiques et que (DJD,,) = 1 + Kd. D'autreslaboratoiresn'ont trouv6 aucune augmentation, pour les expbriences faites dans des conditions apparemment semblables. On sugg&re que cos augmentations apparent'es et la loi observ&z, sont le r6sultat direct de l'utilisation de profondeurs de p&&ration (245) trop petites pour le pouvoir de r6solution des diff6rentrs mPthotlw d'analysc.
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