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- W2014902146 abstract "The Portevin-Le Chatelier effect refers to repeating non-smooth deformation of a specimen. When the specimen is loaded at a constant rate, this behaviour is manifested in a stepped stressstrain curve. The purpose of this experimental investigation is to determine whether or not macroscopic grain boundaries affect the Portevin-Le Chatelier behaviour. Polycrystal, single crystal and bicrystal specimens of commercial purity aluminium are subjected to a tensile test at a constant load rate at room temperature. The polycrystalline samples are discovered to exhibit continual repeated yielding. Behaviour of these steps is represented by plots of increments of stress and strain versus strain which are found to be reproducible. In contrast, the single crystals exhibit two groups of steps, each beginning at a reproducible value of resolved shear stress. The resolved shear stress of the initial step in a single crystal, when related through the Taylor aggregate theory, predicts the observed initial step stress in the polycrystals. Consideration of bicrystals and crystals with stray grains shows that the presence of grain boundaries tends to proliferate repeated yield. Thus the initial step (or first few steps) is the result of intragranular yielding, but the following steps are affected by grain boundaries." @default.
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- W2014902146 date "1966-07-01" @default.
- W2014902146 modified "2023-09-28" @default.
- W2014902146 title "The Portevin-Le Chatelier effect in aluminium single crystals and polycrystals" @default.
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- W2014902146 doi "https://doi.org/10.1016/0022-5096(66)90029-9" @default.
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