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Titel: The kinetics of dislocation climb over hard particles. - 2 : Effects of an attractive particle dislocation interaction
Verfasser: Arzt, Eduard
Rösler, Joachim
Sprache: Englisch
Erscheinungsjahr: 1988
Quelle: Acta metallurgica. - 36. 1988, 4, S. 1053-1060
SWD-Schlagwörter: Hochdisperses Metall
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DDC-Sachgruppe: 620 Ingenieurwissenschaften und Maschinenbau
Dokumentart : Journalartikel
Kurzfassung: A model for the high-temperature creep strength of dispersion strengthened materials is presented. It is based on part I of this paper which treated dislocation climb over "non-interacting" particles. The present part II deals with the kinetics of dislocation climb over hard particles which exert an attractive force on the dislocations. The attraction is shown to affect the climb and bypass process in two ways : (i) above a certain stress, local climb becomes a stable mechanism, and (ii) a strong threshold stress appears for detachment of the dislocation from the particle. Thermal activation of the detachment process and aparticle dragging are incorporated and shown to affect the threshold stress for very small particles. Qualitative comparison of predictions with the creep behaviour of dispersion-strengthened materials suggests that an attractive interaction is probably the key to a better understanding of the highly stress-sensitive creep rate in these materials.
Link zu diesem Datensatz: urn:nbn:de:bsz:291-scidok-20136
hdl:20.500.11880/24004
http://dx.doi.org/10.22028/D291-23948
SciDok-Publikation: 22-Dez-2008
Fakultät: Sonstige Einrichtungen
Fachrichtung: SE - INM Leibniz-Institut für Neue Materialien
Fakultät / Institution:INM
SE - Sonstige Einrichtungen

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