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HomeMaterials Science ForumMaterials Science Forum Vols. 838-839Low-Temperature Superplasticity in an Al-Mg-Sc...

Low-Temperature Superplasticity in an Al-Mg-Sc Alloy Processed by ECAP

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Abstract:

The ultrafine grained structure of an AA5024 with an average size of ∼0.7 μm was produced by equal-channel angular pressing (ECAP) at 300°C with a total strain of ~12. Superplastic behavior of this alloy was examined in the temperature interval 175 - 300°C at strain rates ranging from 10^-4 to 10^-1 s^-1. The maximum elongation-to-failure of ~1200% with the corresponding strain rate sensitivity coefficient, m, of ∼0.49 was attained at a temperature of 275°C and a strain rate of 5.6×10^–³s^–¹. At 175°C (~0.53T_m, where T_m is the melting point), the elongation-to-failure of ~370% with the m value of ~0.3 was found at ε̇=1.4×10^–⁴ s^–¹.

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Periodical:

Materials Science Forum (Volumes 838-839)

Pages:

422-427

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.838-839.422

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Online since:

January 2016

Authors:

Diana Yuzbekova*, Anna Mogucheva, Rustam Kaibyshev

Keywords:

Aluminium Alloy, Equal-Channel Angular Pressing, Low-Temperature Superplasticity, Ultrafine Grained Structure

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© 2016 Trans Tech Publications Ltd. All Rights Reserved

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