Optimization of RT superplasticity of UFG Zn-22Al alloy by applying ECAP at different temperatures and phase regions

Küçük Resim Yok

Tarih

2017

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Institute of Physics Publishing

Erişim Hakkı

info:eu-repo/semantics/openAccess

Özet

Zn-22Al alloy was subjected to either one-step or two-step equal channel pressing (ECAP) to investigate the effect of processing temperature on its microstructure and room temperature (RT) superplasticity. In one-step ECAP processes, 4 passes ECAP were applied to the alloy at different temperatures: RT, 100°C and 250°C in two-phase region below eutectoid temperature and 350°C in single-phase region above eutectoid temperature. In two-step ECAP processes, one-step ECAP-processed samples were subjected to four more passes ECAP at RT. Considering the one-step ECAP processing, RT superplasticity increased with decreasing ECAP temperature as expected, and the highest RT superplasticity was achieved as 350% after 4 passes ECAP at RT. On the other hand, application of 4 more passes ECAP at RT to the sample showing the lowest superplastic elongation after one-step ECAP (the sample processed at 350°C) resulted in the maximum RT elongation of 400% at a high strain rate of 5×10-2 s-1. These results suggest that first step temperature of two-step ECAP process is needed to increase above the eutectoid point of Zn-22Al alloy to achieve high RT superplasticity. These results were attributed to the changes in microstructure inside the single-phase and two-phase regions during the processes. © Published under licence by IOP Publishing Ltd.

Açıklama

7th International Conference on Nanomaterials by Severe Plastic Deformation, NanoSPD 2017

Anahtar Kelimeler

Aluminum, Microstructure, Nanostructured materials, Plastic deformation, Processing, Strain rate, Superplasticity, Zinc, ECAP processing, Equal-channel, High strain rates, Phase region, Processing temperature, Single phase region, Superplastic elongation, Two-phase region, Equal channel angular pressing, Aluminum, Microstructure, Nanostructured materials, Plastic deformation, Processing, Strain rate, Superplasticity, Zinc, ECAP processing, Equal-channel, High strain rates, Phase region, Processing temperature, Single phase region, Superplastic elongation, Two-phase region, Equal channel angular pressing

Kaynak

IOP Conference Series: Materials Science and Engineering

WoS Q Değeri

N/A

Scopus Q Değeri

N/A

Cilt

194

Sayı

1

Künye