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Lookup NU author(s): Dr Settivari Nagarjuna, Emeritus Professor Terry Evans
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The influence of grain size and temperature on the serration patterns of the Portevin-Le Chatelier (PLC) effect and on the yield and flow stresses in a Cu-1 wt-%Cd alloy was investigated in the temperature range 150 to 360 � C. Two kinds of serration patterns were observed in this alloy. Type I occurred at lower temperatures and its yield points are moderately spaced. Type II consists of regular jerky flow observed athigher temperatures. The Hall-Petch equation is obeyed over the temperature range in which jerky flow occurs. The Hall-Petch parameter k (ε) is observed to show a local maximum in the temperature range where serrated flow is first observed. The PLC effect is associated with the solute- dislocation interactions, implying that k (ε) contains a component associated with grain size dependent dislocation storage.
Author(s): Evans JT; Nagarjuna S; Anozie FN
Publication type: Article
Publication status: Published
Journal: Materials Science and Technology
Year: 2003
Volume: 19
Issue: 12
Pages: 1661-1664
ISSN (print): 0267-0836
ISSN (electronic): 1743-2847
Publisher: Maney Publishing
URL: http://dx.doi.org/10.1179/026708303225009481
DOI: 10.1179/026708303225009481
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