Effect of equal-channel angular pressing on room temperature superplasticity of quasi-single phase Zn-0.3Al alloy
Küçük Resim Yok
Tarih
2015
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Quasi-single phase (dilute) Zn-0.3Al alloy was subjected to severe plastic deformation via equal-channel angular extrusion/pressing (ECAE/P), and the effects of ECAP on its room temperature (RT) and high strain rate (HSR) superplasticity and deformation mechanism were investigated. Multi-pass ECAP may refine the coarse-grained microstructure into the fine grained (FG) one. The grain size of Zn-matrix phase decreased down to 2.0m after ECAP. Many spherical Al-rich precipitates decomposed and homogeneously distributed inside the matrix phase. They are ultrafine grained (UFG) ?-particles with the grain sizes ranging from 50nm to ~200nm. This special microstructure having FG and UFG micro-constituents brought about an improvement in RT superplasticity even at HSRs. While multi-pass ECAP decreased flow stress of the alloy, its elongation to failure increased substantially depending on the initial strain rates. The maximum elongation was 1000% at a low strain rate of 10-4s-1, and 350% elongation was achieved at a high strain rate of 10-2s-1. Grain boundary sliding (GBS) was found to be the main deformation mechanism in region-II as the optimum superplastic region. © 2015 Elsevier B.V..
Açıklama
Anahtar Kelimeler
Dilute Zn-Al alloys, Fine-grained microstructure, Room temperature superplasticity, Severe plastic deformation, Aluminum, Elongation, Extrusion, Grain boundaries, Grain boundary sliding, Grain size and shape, Microstructure, Plastic deformation, Pressing (forming), Strain rate, Superplasticity, Zinc, Deformation mechanism, Equal channel angular extrusion, Fine-grained microstructure, Grain-boundary slidings, Room-temperature superplasticity, Severe plastic deformations, Ultra-fine grained ( UFG), ZnAl alloy, Equal channel angular pressing, Dilute Zn-Al alloys, Fine-grained microstructure, Room temperature superplasticity, Severe plastic deformation, Aluminum, Elongation, Extrusion, Grain boundaries, Grain boundary sliding, Grain size and shape, Microstructure, Plastic deformation, Pressing (forming), Strain rate, Superplasticity, Zinc, Deformation mechanism, Equal channel angular extrusion, Fine-grained microstructure, Grain-boundary slidings, Room-temperature superplasticity, Severe plastic deformations, Ultra-fine grained ( UFG), ZnAl alloy, Equal channel angular pressing
Kaynak
Materials Science and Engineering A
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
644
