Effect of different processes on lamellar-free ultrafine grain formation, room temperature superplasticity and fracture mode of Zn-22Al alloy
Küçük Resim Yok
Tarih
2016
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The Zn-22 wt.%Al was processed using five different selected routes including thermal, thermo-mechanical and severe plastic deformation (SPD) techniques in order to produce ultrafine grained (UFG) microstructure for achieving room temperature (RT) and high strain rate (HSR) superplasticity, and to compare the same set of the results. After all routes, the microstructural evolutions and RT uniaxial tensile tests at different strain rates ranging from 1 × 10-3 to 1 × 100 s-1 were investigated. The smallest grain size was achieved to be 300 nm after the thermo-mechanical process including conventional hot and cold rolling steps. However, the lamellar microstructure of the alloy was not completely eliminated during that process. On the other hand, equal-channel angular pressing (ECAP) as one of the SPD techniques decreased the grain size down to 400 nm with a lamellar-free microstructure. The maximum elongation value was achieved to be 330% with the sample tested at 1 × 10-3 s-1 after a thermo-mechanical process including conventional hot and cold rolling, and an aging stage between these rolling steps. It was found that lamellar-free microstructure causes higher superplastic elongation even if it has higher grain size compared to the sample having partially lamellar structure. © 2015 Elsevier B.V.
Açıklama
Anahtar Kelimeler
Severe plastic deformation, Superplasticity, UFG materials, Zn-22Al alloy, Aluminum, Cold rolling, Equal channel angular pressing, Grain size and shape, Hot rolling, Microstructure, Plastic deformation, Pressing (forming), Strain rate, Superplasticity, Tensile testing, Zinc, Lamellar microstructure, Room-temperature superplasticity, Severe plastic deformations, Superplastic elongation, Thermomechanical process, UFG materials, Ultra fine grained microstructure, Zn-22Al, Lamellar structures, Severe plastic deformation, Superplasticity, UFG materials, Zn-22Al alloy, Aluminum, Cold rolling, Equal channel angular pressing, Grain size and shape, Hot rolling, Microstructure, Plastic deformation, Pressing (forming), Strain rate, Superplasticity, Tensile testing, Zinc, Lamellar microstructure, Room-temperature superplasticity, Severe plastic deformations, Superplastic elongation, Thermomechanical process, UFG materials, Ultra fine grained microstructure, Zn-22Al, Lamellar structures
Kaynak
Journal of Alloys and Compounds
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
663
