In situ TEM investigation of microstructural behavior of superplastic Al–Mg–Sc alloy

Journal Article · Fri Feb 15 04:00:00 EST 2013 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2012.12.005· OSTI ID:22285027

Dám, Karel ^[1]; Lejček, Pavel ^[2]; Michalcová, Alena ^[1]

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1. Department of Metals and Corrosion Engineering, Institute of Chemical Technology, Prague, Technická 5, 166 28 Prague 6 (Czech Republic)
2. Institute of Physics of the ASCR, Na Slovance 2, 182 21 Prague 8 (Czech Republic)

Dynamic changes in microstructure of the superplastic ultrafine-grained Al–3Mg–0.2Sc (wt.%) alloy refined by equal-channel angular pressing (ECAP). were observed by in situ transmission electron microscopy at temperatures up to 300 °C (annealing and tensile deformation) in order to simulate the initial stages of superplastic testing. It was found that the microstructure changes significantly during the preheating before the superplastic deformation, which was accompanied by decreased microhardness. During the deformation at 300 °C, high dislocation activity as well as motion of low-angle grain boundaries was observed while high-angle grain boundaries did not move due to the presence of scandium in the alloy. - Highlights: ► We performed in situ TEM annealing and straining on superplastic Al–Mg–Sc alloy. ► We simulated the conditions of early stages of superplastic testing. ► Significant changes in microstructure occur during preheating before deformation.

• OSTI ID: 22285027
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Vol. 76; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANNEALING
DEFORMATION
DISLOCATIONS
GRAIN BOUNDARIES
MICROHARDNESS
PRESSING
SCANDIUM
STRAINS
TRANSMISSION ELECTRON MICROSCOPY