000202800 001__ 202800
000202800 005__ 20181203023639.0
000202800 0247_ $$2doi$$a10.1038/nmat1765
000202800 022__ $$a1476-1122
000202800 037__ $$aARTICLE
000202800 245__ $$aA predictive mechanism for dynamic strain ageing in aluminium-magnesium alloys
000202800 260__ $$c2006
000202800 269__ $$a2006
000202800 336__ $$aJournal Articles
000202800 520__ $$aDynamic strain ageing (DSA) is the phenomenon in which solute atoms diffuse around dislocations and retard dislocation motion, leading to negative strain-rate sensitivity (nSRS) and thus to material instabilities during processing, an important issue in commercial metal alloys. Here, we show the mechanism of DSA and nSRS on experimental strain-rate, temperature and stress scales for Al-Mg to be single-atomic-hop motion of solutes from the compression to the tension side of a dislocation core. We derive an analytic expression for the strengthening versus strain rate and temperature that justifies widely used phenomenological forms, provides specific dependences of the parameters on material properties and is supported by atomistic kinetic Monte Carlo simulations. Using literature material properties, the predicted strengthening quantitatively agrees with the experimentally derived behaviour of Al-2.5% Mg at 300K, and qualitatively agrees with the strain rate and temperature ranges of DSA and nSRS in Al-Mg alloys. The analyses herein show a clear path for multiscale design, from quantum to continuum mechanics, of solute strengthening in face-centred-cubic metal alloys.
000202800 6531_ $$aal-mg alloys
000202800 6531_ $$aal/mg alloys
000202800 6531_ $$abinding force
000202800 6531_ $$adirac solute atmosphere
000202800 6531_ $$adislocation dynamics
000202800 6531_ $$aedge dislocation
000202800 6531_ $$ajerky flow
000202800 6531_ $$arate sensitivity
000202800 6531_ $$asimulation
000202800 6531_ $$asolid-solutions
000202800 700__ $$0246474$$g211624$$aCurtin, W. A.
000202800 700__ $$aOlmsted, D. L.
000202800 700__ $$aHector, L. G.
000202800 773__ $$j5$$tNature Materials$$q875-880
000202800 909C0 $$xU12614$$0252513$$pLAMMM
000202800 909CO $$pSTI$$particle$$ooai:infoscience.tind.io:202800
000202800 937__ $$aEPFL-ARTICLE-202800
000202800 970__ $$acurtin_predictive_2006/LAMMM
000202800 973__ $$rREVIEWED$$sPUBLISHED$$aOTHER
000202800 980__ $$aARTICLE