Effect of natural aging on RT and HSR superplasticity of ultrafine grained Zn-22Al alloy
Küçük Resim Yok
Tarih
2016
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Trans Tech Publications Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Zn–22Al alloy was processed using a well-designed two-step equal channel angular extrusion/pressing (ECAE/P), and ultrafine-grained (UFG) microstructure with 200 nm grain size was achieved. UFG Zn-22Al was subjected to long-term (up to 60 days) aging at room temperature (RT) and it was seen that natural aging caused limited grain growth in the microstructure. Grain sizes of about 300 nm, 350 nm and 350 nm were measured after 15, 30 and 60 days aging, which mean that UFG Zn-22Al alloy has a good microstructural stability at RT up to 60 days. ECAPed Zn-22Al alloy showed a maximum elongation of about 400% at a high strain rate of 5×10-2 s-1 and maximum elongation decreased with increasing grain size. Elongation to failures of ~375% and ~350% were obtained with the samples having 300 nm and 350 nm grain sizes, respectively. In addition, natural aging slightly decreased the strain rate at which superplastic region formed. While the maximum elongation occurred at the strain rate of 5×10-2 s-1 in ECAPed UFG alloy, it took place at lower strain rate of 1×10-2 s-1 after aging for all time periods. Also, flow stress of the alloy increased with increasing grain size during natural aging. © 2016 Trans Tech Publications, Switzerland.
Açıklama
12th International Conference on Superplasticity in Advanced Materials, ICSAM 2015
Anahtar Kelimeler
High strain rate superplasticity, Natural aging, Ultrafine-grained materials, Zn–22Al alloy, Aluminum, Elongation, Extrusion, Grain growth, Grain size and shape, Microstructure, Superplasticity, Zinc, Elongation to failure, Equal channel angular extrusion, High-strain-rate superplasticity, Microstructural stability, Natural aging, Ultra fine grained microstructure, Ultra-fine-grained, Ultrafine grained materials, Strain rate, High strain rate superplasticity, Natural aging, Ultrafine-grained materials, Zn–22Al alloy, Aluminum, Elongation, Extrusion, Grain growth, Grain size and shape, Microstructure, Superplasticity, Zinc, Elongation to failure, Equal channel angular extrusion, High-strain-rate superplasticity, Microstructural stability, Natural aging, Ultra fine grained microstructure, Ultra-fine-grained, Ultrafine grained materials, Strain rate
Kaynak
Materials Science Forum
WoS Q Değeri
Scopus Q Değeri
Q4
Cilt
838-839
