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Effect of grain refinement and phase composition on room temperature superplasticity and damping capacity of dual-phase Zn–Al alloys

Published online by Cambridge University Press:  27 April 2018

Muhammet Demirtas ,
Kadri C. Atli ,
Harun Yanar  and
Gencaga Purcek
Muhammet Demirtas
Affiliation:
Department of Mechanical Engineering, Bayburt University, Bayburt 69000, Turkey
Kadri C. Atli
Affiliation:
Department of Mechanical Engineering, Anadolu University, Eskisehir 26555, Turkey
Harun Yanar
Affiliation:
Department of Mechanical Engineering, Karadeniz Technical University, Trabzon 61080, Turkey
Gencaga Purcek*
Affiliation:
Department of Mechanical Engineering, Karadeniz Technical University, Trabzon 61080, Turkey
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effects of grain refinement and phase composition on superplasticity and damping capacity of eutectic Zn–5Al and eutectoid Zn–22Al alloys were investigated. For grain refinement, equal-channel angular pressing (ECAP) was applied to these alloys. ECAP completely eliminated the as-cast lamellar microstructures of both alloys and resulted in ultrafine-grained structures along with room temperature superplasticity. Furthermore, these microstructural changes with ECAP increased the damping capacity of both alloys in the dynamic hysteresis region, where damping arises from viscous sliding of phase/grain boundaries. Dynamic recrystallization at the surface and thermally activated viscous motion of grain/phase boundaries at the subsurface of the samples of both alloys were proposed as the damping mechanisms in the region where the alloys showed combined aspects of static/dynamic hysteresis damping behavior. Although the grain size is larger in Zn–5Al compared to Zn–22Al, it showed higher damping capacity due to the different sliding characteristics of its phase boundaries.

Keywords

internal frictionmicrostructuresuperplasticity
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 8 , 27 April 2018 , pp. 1032 - 1045
Copyright
Copyright © Materials Research Society 2018 

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References

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