Constitutive behavior of as-cast A356

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• 作者：M.J. Roy^a ; ^{majroy@interchange.ubc.ca} ; D.M. Maijer^a ; ^{daan.maijer@ubc.ca} ; L. Dancoine^b ; ^{louise.dancoine@etu.ensma.fr}
• 关键词：Constitutive behavior ; Aluminum alloy ; A356 ; Casting ; Plasticity ; Flow stress
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：30 June, 2012
• 卷：548
• 期：Complete
• 页码：195-205
• 文件大小：2104 K

摘要

The constitutive behavior of aluminum alloy A356 in the as-cast condition has been characterized using compression tests performed over a wide range of deformation temperatures (30-500 掳C) and strain rates (鈭?.1-10 s^鈭?). This work is intended to support the development of process models for a wide range of conditions including those relevant to casting, forging and machining. The flow stress behavior as a function of temperature and strain rate has been fit to a modified Johnson-Cook and extended Ludwik-Hollomon expression. The data has also been assessed with both the strain-independent Kocks-Mecking and Zener-Hollomon frameworks. The predicted plastic flow stress for each expression are compared. The results indicate that the extended Ludwik-Hollomon is best suited to describe small strain conditions (stage III hardening), while the Kocks-Mecking is best employed for large strain (stage IV). At elevated temperatures, it was found that the Zener-Hollomon model provides the best prediction of flow stress.