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Low-temperature superplasticity of friction stir processed Al-Zn-Mg-Cu alloy

SCRIPTA MATERIALIA (2008)

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SCRIPTA MATERIALIA
卷 58, 期 8, 页码 667-670

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2007.11.044

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superplasticity; friction stir processing; ultrafine grain; aluminum

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Nanoscience & Nanotechnology Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering

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Friction stir processing was used to produce ultrafine-grained Al-Zn-Mg-Cu alloy. Low-temperature superplasticity of 350-540% was achieved at 200-350 degrees C. Increasing the temperature resulted in an increased optimum strain rate for maximum elongation. At 350 degrees C, the optimum strain rate shifted to a high strain rate of 1 x 10(-2) s(-1). A strain rate sensitivity of 0.33-0.42 was observed for maximum elongation at the investigated temperatures. Grain boundary sliding was observed even at 200 degrees C. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

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