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Materials 2015, 8(11), 7650-7662; https://doi.org/10.3390/ma8115401

High Temperature Deformation of Twin-Roll Cast Al-Mn-Based Alloys after Equal Channel Angular Pressing

Department of Physics of Materials, Charles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 5, Prague 2 12116, Czech Republic
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Academic Editor: Daolun Chen
Received: 12 October 2015 / Revised: 23 October 2015 / Accepted: 29 October 2015 / Published: 12 November 2015
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

Twin roll cast Al-Mn- and Al-Mn-Zr-based alloys were subjected to four passes of equal channel angular pressing. The resulting grain size of 400 nm contributes to a significant strengthening at room temperature. This microstructure is not fully stable at elevated temperatures and recrystallization and vast grain growth occur at temperatures between 350 and 450 °C. The onset of these microstructure changes depends on chemical and phase composition. Better stability is observed in the Al-Mn-Zr-based alloy. High temperature tensile tests reveal that equal channel angular pressing results in a softening of all studied materials at high temperatures. This can be explained by an active role of grain boundaries in the deformation process. The maximum values of ductility and strain rate sensitivity parameter m found in the Al-Mn-Zr-based alloy are below the bottom limit of superplasticity (155%, m = 0.25). However, some features typical for superplastic behavior were observed—the strain rate dependence of the parameter m, the strengthening with increasing grain size, and the fracture by diffuse necking. Grain boundary sliding is believed to contribute partially to the overall strain in specimens where the grain size remained in the microcrystalline range. View Full-Text
Keywords: Al-Mn-based alloys; TRC; ECAP; microstructure stability; high temperature mechanical properties Al-Mn-based alloys; TRC; ECAP; microstructure stability; high temperature mechanical properties
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Málek, P.; Šlapáková Poková, M.; Cieslar, M. High Temperature Deformation of Twin-Roll Cast Al-Mn-Based Alloys after Equal Channel Angular Pressing. Materials 2015, 8, 7650-7662.

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