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A model for predicting the yield stress of AA6111 after multi-step heat treatments

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Title: A model for predicting the yield stress of AA6111 after multi-step heat treatments
Author: Poole, Warren J.; Raeisinia, B.; Wang, X.; Lloyd, D.J.
Subject Keywords yield stress;AA6111;heat treatment;ageing;multi-step;modeling
Issue Date: 2006
Publicly Available in cIRcle 2008-02-20
Publisher Springer
Citation: Raeisinia, B., Poole, W.J., Wang, X., Lloyd, D.J., A model for predicting the yield stress of AA6111 after multistep heat treatments. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science (2006), 37A(4), 1183-1190. dx.doi.org/10.1007/s11661-006-1069-8 The original publication is available at www.springerlink.com.
Abstract: A model has been developed to predict the yield stress of the aluminum alloy AA6111 after multi-step heat treatments which involve combinations of ambient temperature ageing and high temperature artificial ageing. The model framework follows the internal state variable framework where the two principal state variables are i) the volume fraction of clusters which form at ambient temperature and ii) the volume fraction of metastable phases which form during high temperature ageing. The evolution of the these state variables has modeled using a set of coupled differential equations. The mechanical response (the yield stress) is then formulated in terms of the state variables through an appropriate flow stress addition law. To test the model predictions a series of experiments were conducted which examined two scenarios for multi-step heat treatments. In general, good agreement was observed between the model predictions and the experimental results. However, for the case where a short thermal excursion at 250oC was applied immediately after the solution treatment, the results were not satisfactory. This can be understood in terms of the importance of the temperature dependence for the nucleation density of metastable precipitates.
Affiliation: Materials Engineering, Dept ofMetallurgical Process Engineering (CMPE), Centre for
URI: http://hdl.handle.net/2429/398
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