Structure and Superplasticity of the Al-Mg-TM Alloy after Equal Channel Angular Pressing and Rolling

O. Sitdikov, E. Avtokratova, O. Latypova, M.V. Markushev show affiliations and emails
Received 17 October 2018; Accepted 23 October 2018;
Citation: O. Sitdikov, E. Avtokratova, O. Latypova, M.V. Markushev. Structure and Superplasticity of the Al-Mg-TM Alloy after Equal Channel Angular Pressing and Rolling. Lett. Mater., 2018, 8(4s) 561-566
BibTex   https://doi.org/10.22226/2410-3535-2018-4-561-566

Abstract

Microstructure and superplastic (SP) characteristics of the alloy 1570C subjected to equal channel angular pressing (ECAP) at the temperature of 325°C and subsequent warm rolling (WR) at the same temperature and cold rolling (CR) at room temperature with reductions 86 and 80%, respectively, were compared.The microstructure and superplastic (SP) characteristics of the commercial alloy 1570C (Al - 5Mg - 0.18Mn - 0.2Sc - 0.08Zr - 0.01Fe - 0.01Si, wt.%) subjected to equal channel angular pressing (ECAP) at the temperature of 325°C (about 0.6Tm) to the effective strain of 8 and subsequent isothermal rolling at the same and room temperatures with reductions 86 and 80%, respectively, were compared. It has been found that the development of ultrafine grained structure under ECAP with the grain size of about 1 µm and the volume fraction of 0.60 - 0.70 led to the unique alloy SP properties with the maximum elongations - to - failure up to 3300% in a wide temperature - strain rate range. Subsequent warm rolling resulted in increased to 0.80 - 0.85 volume fraction of ultrafine grains with no changes in their size, while cold rolling, in contrast, provided a heavily deformed (work hardened) structure with a high dislocation density. Despite such difference in the structures formed, the alloy SP behavior in both rolled states was nearly similar with maximum elongations about 2800% at the temperature of 520°C and the strain rate of 1.4 × 10-2 s-1. Also, roughly similar microstructures were developed under such optimum alloy SP deformation conditions, irrespectively of its rolling temperature.

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