Optimization of RT superplasticity of UFG Zn-22Al alloy by applying ECAP at different temperatures and phase regions
Küçük Resim Yok
Tarih
2017
Yazarlar
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
