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- W2013197033 abstract "By means of low-frequency internal-friction measurements in an inverted torsion pendulum at 0.5 to 15 Hz, the so-called γ-relaxation in high-purity molybdenum (occurring between 400 and 550 K) is investigated on predeformed single crystals with torsion axes 〈011〉 or 〈112〉. The sum of the formation enthalpy of widely separated kink pairs on a0〈111〉/2 screw dislocations, 2HkM, and of the migration enthalpy for the migration of the kinks along these dislocations, H, is obtained by the peak-shift method and found to be 2Hk + H = (1.275 ± 0.03) eV. This agrees with the value 2Hk = 1.22 eV deduced earlier from the analysis of the strain-rate and temperature dependence of the flow stress of pure molybdenum after cyclic deformation into saturation. The present results are in full agreement with the view that in refractory b.c.c. metals the kink-pair formation on screw dislocations controls the γ-relaxation as well as the plastic deformation at low and intermediate temperatures. Die in Mo zwischen etwa 400 und 550 K zu beobachtende sogenannte γ-Relaxation wird anhand von Messungen der inneren Reibung in einem invertierten Torsionspendel im Frequenzbereich 0,5 bis 15 Hz an vorverformten Mo-Einkristallen hoher Reinheit mit zwei verschiedenen Orientierungen der Kristallachse (〈011〉 bzw. 〈112〉) untersucht. Die Ergebnisse sind in völligem Einklang mit der Deutung der γ-Relaxation als thermisch aktivierter Bildung von Kinkpaaren in a0〈111〉/2-Schraubenversetzungen. Für die Summe aus der Kinkpaarbildungsenergie 2Hk und Wanderungsenergie H der Kinken ergibt sich (1,275 ± 0,03) eV. Dieser Wert ist in guter Übereinstimmung mit dem Wert 2Hk = 1,22 eV, der aus früheren Messungen der Temperatur- und Geschwindigkeitsabhängigkeit der Fließspannung von zyklisch bis zur Sättigung verformten reinen Molybdäneinkristalle abgeleitet wurde." @default.
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- W2013197033 date "1992-06-16" @default.
- W2013197033 modified "2023-10-18" @default.
- W2013197033 title "The dislocation relaxation by kink-pair formation on screw dislocations in high-purity molybdenum" @default.
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- W2013197033 doi "https://doi.org/10.1002/pssa.2211310240" @default.
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