Strain Hardening in an AZ31 Alloy Submitted to Rotary Swaging

An extruded magnesium AZ31 magnesium alloy was processed by rotary swaging (RSW) and then deformed by tension and compression at room temperature. The work-hardening behaviour of 1-5 times swaged samples was analysed using Kocks-Mecking plots. Accumulation of dislocations on dislocation obstacles an...

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Bibliographic Details
Published in:Materials 2020-12, Vol.14 (1), p.157
Main Authors: Trojanová, Zuzanka, Drozd, Zdeněk, Halmešová, Kristýna, Džugan, Ján, Škraban, Tomáš, Minárik, Peter, Németh, Gergely, Lukáč, Pavel
Format: Article
Language:English
Subjects:
Anisotropy
Asymmetry
Cross slip
Deformation
Extrusion
Grain size
Magnesium alloys
Magnesium base alloys
Precipitation hardening
Room temperature
Rotary swaging
Strain hardening
Swaging
Twin boundaries
Twinning
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Summary:An extruded magnesium AZ31 magnesium alloy was processed by rotary swaging (RSW) and then deformed by tension and compression at room temperature. The work-hardening behaviour of 1-5 times swaged samples was analysed using Kocks-Mecking plots. Accumulation of dislocations on dislocation obstacles and twin boundaries is the deciding factor for the strain hardening. Profuse twinning in compression seems to be the reason for the higher hardening observed during compression. The main softening mechanism is apparently the cross-slip between the pyramidal planes of the second and first order. A massive twinning observed at the deformation beginning influences the Hall-Petch parameters.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma14010157