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The role of internal stresses on the plastic deformation of the Al–Mg–Si–Cu alloy AA6111

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Title: The role of internal stresses on the plastic deformation of the Al–Mg–Si–Cu alloy AA6111
Author: Poole, Warren J.; Proudhon, H.; Wang, X.; Brechet, Y.
Subject Keywords AA6111;internal stress;Aluminum Manganese Silicon Copper;Al-Mg-Si-Cu;plastic deformation;Bauschinger
Issue Date: 2008
Publicly Available in cIRcle 2008-02-21
Publisher Taylor and Francis
Citation: Proudhon, H., Poole, W.J., Wang, X.Y. Brechet, Y. The role of internal stresses on the plastic deformation of the Al–Mg–Si–Cu alloy AA6111. Philosophical Magazine. Preprint of an article whose final and definitive form has been published in the Philosophical Magazine(c) 2008 Copyright Taylor & Francis; Philosophical Magazine is available online at http://www.informaworld.com
Abstract: In this work, we have investigated the internal stress contribution to the flow stress for a commercial 6xxx aluminium alloy (AA6111). In contrast to stresses from forest and precipitation hardening, the internal stress cannot be assessed properly with a uniaxial tensile test. Instead, tension-compression tests have been used to measure the Bauschinger stress and produce a comprehensive study which examines its evolution with i) the precipitation structure and ii) a wide range of applied strain. A large set of ageing conditions was investigated to explore the effect of the precipitation state on the development of internal stress within the material. It is shown that the Bauschinger stress generally increases with the applied strain and critically depends on the precipitate average radius and is thus linked to the shearable/non shearable transition. Further work in the case of non-shearable particles shows that higher strain eventually lead to particle fracture and the Bauschinger stress then rapidly decreases. Following the seminal work of Brown et al, a physically based approach including plastic relaxation and particle fracture is developed to predict the evolution of the internal stress as a function of the applied strain. Knowing the precipitation structure main characteristics –such as the average precipitate radius, length and volume fraction– allows one to estimate accurately the internal stress contribution to the flow stress with this model.
Affiliation: Materials Engineering, Dept ofMetallurgical Process Engineering (CMPE), Centre for
URI: http://hdl.handle.net/2429/416
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