Microstructural Evolution in a Commercial Al-Mg-Sc Alloy during ECAP at 300°C

Oleg Sitdikov; Taku Sakai; Elena Avtokratova; Rustam Kaibyshev; Kaneaki Tsuzaki; Yoshimi Watanabe

doi:10.4028/www.scientific.net/MSF.558-559.569

Paper Titles

Effect of Deformation Temperature on Microstructure Evolution in 2219 Aluminum Alloy during ECAP
p.545

Effect of Grain Boundary Migration on Texture Formation in Al-3mass%Mg Solid Solution during High Temperature Deformation
p.551

Formation of Ultrafine Grained Ferrite by Warm Deformation of Tempered Lath Martensite in Low Alloy Steels
p.557

Modelling of the Dynamic Processes of Structure Formation by Macroscopic Parameters of Plastic Deformation
p.563

Microstructural Evolution in a Commercial Al-Mg-Sc Alloy during ECAP at 300°C
p.569

Influence of Dynamic Recrystallisation on Texture Formation in ECAP deformed Nickel
p.575

Recrystallisation, Structure, Texture and Properties of Pipe Steel Rolled at Wide Temperature Range
p.581

An Investigation of Microstructure Inhomogeneity in Waspaloy Subjected to Plane Strain Compression Testing
p.589

Relationship between Grain Boundary Diffusion and Ferrite Grain Size Formed through Dynamic Recrystallization during Large Strain Deformation
p.595

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Microstructural Evolution in a Commercial Al-Mg-Sc Alloy during ECAP at 300°C

Abstract:

Microstructural evolution taking place during equal channel angular pressing (ECAP) was studied in a commercial coarse-grained Al-6%Mg-0.4%Mn-0.3%Sc alloy at a temperature of 300oC (~0.6Tm). Samples were pressed using route A to a total strain of 12 and quenched in water after each ECAP pass. ECAP at moderate-to-high strains leads to the formation of a bimodal grain structure with grain sizes of around 1 and 8 μm and volume fractions of 0.3 and 0.6, respectively. The development of new-grained regions has been shown to result from a concurrent operation of continuous dynamic recrystallization that occurs during deformation and static recrystallization that occurs during each ECAP cycle by the exposure of the as-deformed material in the die kept at 300oC for around 1.5 minutes. The microstructural development during warm-to-hot ECAP is discussed in terms of the enhanced driving force for recrystallization, resulting from the evolution of high-density dislocation substructures due to the localization of plastic flow and inhibition of recovery in the present alloy.