By John Askill
Atomic diffusion in metals used to be first found a few sixty-five years in the past, and because then a substantial wealth of knowledge has ac cumulated on diffusion in a number of structures. despite the fact that, paintings sooner than concerning the 12 months 1940 is now as a rule of ancient curiosity, because ex periments have been frequently conducted below experimental stipulations and with equipment of research resulting in uncertainties in inter preting the measured diffusion coefficients. information on diffusion premiums are of value in strategies that are managed by way of premiums of atomic migration comparable to development of levels and homogenization of alloys. moreover diffusion performs a tremendous half in theories of such phenomena as oxidation, plastic deformation, sintering, and creep. a major boost in diffusion reviews was once made attainable via the provision of radioactive isotopes of sufficiently excessive spe cific task after the second one global conflict. Measurements of self diffusion charges then grew to become attainable utilizing radioactive isotopes having an identical chemical homes because the solvent fabric, and it additionally grew to become attainable to check tracer impurity diffusion whilst the focus of the impurity is so small as to not regulate the chemi cal homogeneity of the method. within the final ten to 15 years the purity of fabrics utilized in diffusion reviews has elevated con siderably and the tools of study became extra stand ardized.
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Extra resources for Tracer Diffusion Data for Metals, Alloys, and Simple Oxides
S. S. A. S. s. s. S. A. 04 ... 65 51 IMPURITY DIFFUSION IN PURE METALS Solute Material Temperature range (0C) Form of analysis Activation energy, Q (kcal! mole) Frequency factor, Do ( cm2/sec) Reference No. 99 S - 650-950 468-942 780-950 ••• 592-937 640-870 640-925 785-895 SOS. S. A •• •• SOS. SOS. SOS. 15 289 289 (1967) (1967) 314 261 (1964) (1966) 315 275 141 (1966) (1955) (1965) SODIUM 4Zr< ~b 0-91 0-85 SOS. SOS. 600-2200 1200-1600 ReA. 0 SOS. S. S. SOS. SOS. 52 Solute Part II Material Temperature range (OC) Form of analysis Activation energy, Q (kcallmole) S oS.
D. S. 0 ... S. S. s. A. A. A. S. G. s. A. A. D. A. A. D. D. ··· 36 PART I Temperature range ( 'C) Material NICKEL Tracer 63 Ni 900 -1200 980-1400 1000-1400 NIOBIUM Tracer Frequency factor, D" (cm" /sec) Reference No. s. G. '" RoA. A. S. s. s. D. A. A. 99 P Activation energy Q (kcal! S. S. s. 999 P Form of analysis 37 Activation energyQ (kcall g-atom) Frequency factor, Do (cm"/sec) Reference No. A. S. S. S. S. G. A. S. G. A. S. A. A. A. 999911c 10 -95 0-98 a-THORIUM P No. S. SOS. S. SOS. A. S oS.
A. S oS. rl 135-230 135-230 SOS. S. s. C Slic S1. 9 S1. 99 S1. 999 P ex-TITANIUM P B-TITANIUM 180-225 180-225 180-223 180-223 - 2-100 178-222 178-222 140-217 130-255 160-226 160 -226 416-490 SOS. S. S. SOS. G. S. III. A. S ...... A. A. P B -URANIUM P No. 09 ,. D. S. S. A. 999 PART I Temperature range ( °C) Form of analysis Activation energy Q (kcallg-atom) Frequency factor, Do ( cm2/sec) Reference No. Year Tracer 2330. 234u. G. S. s. s. s. S. A. A. S. 0' ,. s .. S. S. S. S. S. S. S. S. S. S. o ..
Tracer Diffusion Data for Metals, Alloys, and Simple Oxides by John Askill