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- W1978959096 abstract "Tensile stress strain data for 99.999% copper at room and liquid nitrogen temperature as a function of grain size are presented together with some microstructural observations made by transmission electron microscopy. It is shown that the flow stress data, at constant strain may be expressed in terms of a Hall-Petch relationship. At low strains an inhomogeneous distribution of dislocations is seen whilst at higher strains (0.1–0.2) a more regular cell structure begins to develop. This tends to have a minimum size near to grain boundaries. These microstructural observations are correlated with the mechanical test data. Nous présentons les courbes contrainte-déformation en traction du cuivre 99,999% à la température ambiante et à la température de l'azote liquide en fonction de la taille des grains; nous présentons également quelques observations microstructurales faites par microscopie électronique en transmission. Nous montrons que les résultats concernant la contrainte d'écoulement à déformation constante peuvent s'exprimer à l'aide d'une relation de Hall et petch. Aux faibles déformations, on observe une répartition hétérogène des dislocations, alors qu'aux plus fortes déformations (0.1–0.2) une structure cellulaire plus régulière commence à se développer. Les cellules semblent avoir une taille minimale au voisinage des joints de grains. Nous relions ces observations microstructurales avec les résultats des essais mécaniques. Das Zugverformungsverhalten von 99,999% reinem Kupfer wurde bei Raumtemperatur und 78 K in Abhängigkeit von der Korngröβe untersucht; auβerdem wurde die entstandene Mikrostruktur elektronenmikroskopisch beobachtet. Es wird gezeigt, daβ die Flieβspannungsdaten bei konstanter Dehnung mit einer Hall-Petch-Beziehung beschrieben werden können. Bei kleinen Dehnungen wird eine ungleiche Verteilung von Versetzungen beobachtet, wohingegen bei gröβerer Dehnung (0.1–0.2) sich eine regelmäβigere Zellstruktur entwickelt. Diese Zellstruktur neight dazu, in der Nähe der Korngrenzen am kleinmaschigsten zu sein. Die Beobachtungen zur MikroStruktur werden mit dem gemessenen mechanischen Verhalten korreliert." @default.
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- W1978959096 date "1982-02-01" @default.
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- W1978959096 title "The strain and grain size dependence of the flow stress of copper" @default.
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- W1978959096 doi "https://doi.org/10.1016/0001-6160(82)90221-8" @default.
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