Improvement of high strain rate and room temperature superplasticity in Zn-22Al alloy by two-step equal-channel angular pressing
Küçük Resim Yok
Tarih
2014
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The Zn-22Al alloy was subjected to equal-channel angular pressing (ECAP) to improve its high strain rate (HSR) superplasticity at room temperature (RT). A well-designed two-step ECAP process formed an ultrafine-grained (UFG) microstructure with an average grain size of 200nm as the lowest one obtained so far after ECAP processing of this alloy. Also, agglomerate- and texture-free microstructure with UFG Al-rich ?- and Zn-rich ?-grains separated mostly by high-angle grain boundaries (HAGBs) was produced by this process. The maximum RT elongation was achieved to be 400% with a strain rate sensitivity of 0.30 at a very high strain rate of 5×10-2s-1 after the two-step ECAP process. This elongation value is the highest one obtained at RT and at all strain rates for this alloy up to now. The current results demonstrate that such an improvement in superplasticity of Zn-22Al alloy after the two-step ECAP process can enhance its applications where RT and HSR superplasticity are strongly needed. © 2014 Elsevier B.V.
Açıklama
Anahtar Kelimeler
High strain rate superplasticity, Ultrafine-grained materials, Zn-22Al alloy, High strain rates, High-strain-rate superplasticity, Room-temperature superplasticity, Ultrafine grained materials, Zn-22Al, High strain rate superplasticity, Ultrafine-grained materials, Zn-22Al alloy, High strain rates, High-strain-rate superplasticity, Room-temperature superplasticity, Ultrafine grained materials, Zn-22Al
Kaynak
Materials Science and Engineering A
WoS Q Değeri
Scopus Q Değeri
N/A
Cilt
620