By Karl Hauffe (auth.)
During the interpretation, the writer had the chance to re view numerous chapters, considering the newer literature. so far as attainable all new theoretical options and experi psychological information released ahead of 1963 were quoted and mentioned less than the theoretical standpoint of this publication. a brand new bankruptcy "Passivity and Inhibition in the course of High-Tempera ture Oxidation" was once brought. part 4.8 used to be enlarged by way of a dis cussion of the transition from inner to exterior oxidation. the writer a great deal appreciates the cooperation of the trans lator and of Plenum Press. Gottingen, April 1.965 Karl Hauffe v Preface The variety of courses enthusiastic about oxidation and cor rosion techniques has turn into so copious that many engineers and scientists locate it essentially most unlikely to procure an total view of the growing to be physique of data and to deliver order to the complicated multiplicity of experimental info. for this reason the necessity for a compre hensive survey of the current kingdom of study during this box has be come a growing number of urgent.
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R, and R Smoluchowski: J. Appl. Phys. 22, 1260 (1951). Whipple, R. T. : Phil. Mag. 45, 1225 (1954). , and R. E. Hoffman: Acta Met. 2, 551 (1954). 4. Defect Phenomena and Diffusion Mechanisms in Metals 41 diffusion in silver bicrystals prepared with initially parallel (100) axes which wp,re shifted out of their parallel orientation by rotation through the angle 1X(9° ;;;; IX ;;;; 28°). The data can be evaluated if it is assumed that the selfdiffusion coefficient DK in the "dislocation tubes" of the grain boundaries is independent of IX and that DK is several orders of magnitude larger than the lattice self-diffusion coefficient (at 100°C: DK ~ 4 x 106Dv).
A trivacancy mechanism in a face·centered cubic lattice was proposed by Dienes. 2. , C in y·Fe and Ta), one must always deal with a predominant interstitial diffusion. This mechanism was investigated in detail both experimentally and theoretically by Wert and Zener. 34) The theoretical treatment of the transition·state method is based on the work of Simmons, R. , and R. W. Halluffi: Phys. Rev. 117,52 (1960); 119,980 (1960). , and E. Mann: J. Phys. Chem. Solids 12, 326 (1960); A. Seeger, P. Schiller, and H.
Heilmann: J. Ohem. PhYB. 15, 174 (1947); E. J. W. Verwey, F. De Boer, and J. H. van Santen: J. Ohem. PhYB. 16, 1091 (1948); 18, 1032 (1950). : Z. Krist. 92,139 (1935). 1 24 2. Lattice Defect Phenomena and Diffusion Processes Fig. 15. Spinel lattice according to Machatschki, Barth, and Posnjak. The large white spheres represent the oxide ions; the dotted spheres, metal ions in octahedral positions; and the small black spheres, metal ions in tetrahedral positions. (tetrahedral interstice) and the other of six oxygen ions (octahedral interstice).