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Published in: Journal of Materials Engineering and Performance 7/2022

17-02-2022 | Technical Article

Microstructure Evolution of AZ91 Alloy Processed by Twin Parallel Channel Angular Extrusion Technique

Authors: M. Abdi, R. Ebrahimi

Published in: Journal of Materials Engineering and Performance | Issue 7/2022

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Abstract

In the present study, multi-step processing of an as-cast AZ91 alloy was conducted using twin parallel channel angular extrusion. The first step was conducted at 340 °C to increase the workability, and the next steps were implemented at lower temperatures. Microstructure evolution was investigated via optical microscopy and scanning electron microscopy techniques. Additionally, x-ray diffraction analysis was used to determine the dislocation densities. Moreover, the mechanical strengths are evaluated in terms of indentation hardness values. The results indicate that processing for three passes, implemented, respectively, at temperatures of 340, 300, and 250 °C, gives the most uniform and the finest microstructure, where the average grain size is reduced to approximately 2 µm and the dislocation density to 0.61 × 1014 m−2. Besides, the average hardness value for such a processing condition reaches 104 Vickers, indicating an improvement of ~ 48% in comparison with the initial value. The improvement is due to the different strengthening mechanisms verified by hardness modeling based on the empirical relations.

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Metadata
Title
Microstructure Evolution of AZ91 Alloy Processed by Twin Parallel Channel Angular Extrusion Technique
Authors
M. Abdi
R. Ebrahimi
Publication date
17-02-2022
Publisher
Springer US
Published in
Journal of Materials Engineering and Performance / Issue 7/2022
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI
https://doi.org/10.1007/s11665-022-06680-0

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