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Journal of Materials Engineering and Performance

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11-04-2017

A Revisited Study of the Processing Map and Optimized Workability of AZ61 Magnesium Alloy

Authors: X. Zhou, R. R. Liu, H. T. Zhou, W. X. Jiang

Published in: Journal of Materials Engineering and Performance | Issue 5/2017

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Abstract

The hot deformation behavior of AZ61 magnesium alloy was studied by hot compression testing in the temperature range from 250 to 400 °C with strain rates from 10⁻³ to 1 s⁻¹. Typical flow stress/true strain curves with the features of dynamic recrystallization (DRX) have been obtained. According to the flow stress curves, the processing maps were constructed via the dynamic material model (DMM). The maps exhibit a domain of DRX at temperatures between 330 and 370 °C and strain rates ranging from 10⁻³ to 10⁻² s⁻¹. The corresponding extrusion deformation was carried out in this DRX region. Gleeble 3500, optical microscopy (OM) and transmission electron microscopy (TEM) were used to characterize the microstructure evolution. The microstructure detection of this DRX region shows that the average grain size decreases with decreasing extrusion temperature. TEM observation further indicated that there are irregularly shaped subgrains with a high dislocation density, a dislocation network, the feature of dislocation pileup and an appearance of twin formation in the alloy hot-extruded using the parameters determined by our constructed processing maps.

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Title: A Revisited Study of the Processing Map and Optimized Workability of AZ61 Magnesium Alloy
Authors: X. Zhou
R. R. Liu
H. T. Zhou
W. X. Jiang
Publication date: 11-04-2017
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 5/2017
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-017-2670-2

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