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- W2015402431 abstract "Since its discovery decades ago, a lot of research has been done on the Portevin-Le Chatelier effect and the inhomogeneous flow associated with it. The studies concentrated on the features of localized deformation bands, their correlation with the serrations which appear along the stress-strain curves, and on the aspect of the negative strain-rate sensitivity. Dynamic strain aging was recognized to be the primary cause for all these effects. However, what still remains unclear is the micromechanism leading to the formation of a deformation band, which is actually responsible for the load drop in serrated flow. An investigation of the dislocation structure arising in the wake of serrated flow can provide a clue. An Al-3 wt. % Mg-alloy was used for the present investigation. Flat tensile specimens were prepared and annealed at 350 C for one hour and quenched in water. One batch of samples was deformed on a tensile testing machine at room temperature and the constant strain rate 3 [times] 10[sup [minus]4]/s, giving load-extension curves which were heavily serrated with the types B and/or C. A second batch was strained on a dead-load machine with the method of continuous loading at a constant stress rate of 0.1 MPa/s, leadingmore » to step-like curves as reported earlier. Since the work-hardening rate was approximately constant throughout the strain range which was utilized, it was possible, by choosing the right values for [sigma] and [epsilon], to keep the nominal testing conditions in both types of tests almost the same. The deformation of the specimens was stopped at a strain of 10%, and the microstructures were investigated by light and transmission electron microscopy using the standard double-jet electro-polishing technique.« less" @default.
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- W2015402431 date "1994-01-01" @default.
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- W2015402431 title "Dislocation structures due to inhomogeneous flow in constant-stress-rate and constant-strain-rate tests" @default.
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- W2015402431 doi "https://doi.org/10.1016/0956-716x(94)90371-9" @default.
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