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Studying hydrogen–microstructure interactions is difficult in Al alloys because H charging is usually coupled with some dissolution of the surface in aqueous media. H uptake therefore depends on the microstructure. An intermediate electrodeposited Ni layer is used to solve this problem. It is shown that an enhanced intergranular precipitation, obtained by holding the samples at 400°C before the hardening...
Using a work-hardened aluminum alloy that exhibits dynamic strain aging, oscillations in strain rate transitioning into intermittent local plastic activity are observed through an extended elastoplastic transition, before onset of the Portevin–Le Chatelier effect. Fourier analysis confirms this intermittency spans multiple scales. Wavelet analysis provides a method of quantifying transitions in the...
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