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Dynamic modulus and dislocation segment distribution during deformation

✍ Scribed by E. Bonetti; L. Castellani; P. Gondi


Book ID
102980460
Publisher
Elsevier Science
Year
1983
Weight
856 KB
Volume
31
Category
Article
ISSN
0001-6160

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✦ Synopsis


Ah&act-Dynamic moduli measured directly during deformation have been used to obtain information on the distribution of the dislocation segments. On the assumption of distribution functions of suitable type indications have been drawn from the modulus decrements at given deformation rates on: the limit lengths of the dislocation segments contributing to modulus relaxation and to deformation; the dominant vibration frequency in the thermally activated processes; the average areas involved in each step in dependence on the dislocation structures accompanying deformation at the various temperatures. R&u&-On a fait des mesures de friction interne et de module dynamique directement pendant deformation par fluage, au but d'obtenir des informations sur la tvolution de la distribution des segments des dislocations. Des diminutions de la module et avec l'emploi d'opportunes funtions de distribution on a obtenu des indications sur: la longeur limite des segments qui sont e&aces pour module et deformation; la f&quence efIicacc de vibration dans les pro&b activts thermiquement; la surface moyenne couverte par chaque glissement elementaire en function des structures des dislocations qui accompagnent la deformation aux diffirentes tempt%atures. Zusamm&~Innere Reibung und dynamisches Elastizitiitsmodul sind w&end Kriech-Verformung gemessen worden mu Nachweis auf die Entwickhmg der Verteihmg van Vemetzungs-Segmente zu h&en. Aus den Modul Abnahmen in Verformung folgende Hinweise sind ah&en worden: die IIingeren Segmente der Verteilung die fiir Modul und Verformung wirksam sind; die etTektive frequenz ffir thermisch-aktivierten Vorgiinge; die Mittel-Oberl'liiche fiir jeder Gleit-Stufe in Abtigigkeit von Verformungs Niveau auf Verschiedenen Temperaturen.


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