1468-6996_5_1-2_A23.pdf

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1468-6996_5_1-2_A23

Formation of nanocrystalline surface layers in various metallic materials by near surface severe plastic deformation This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2004 Sci. Technol. Adv. Mater. 5 145 (/1468-6996/5/1-2/A23) Download details: IP Address: 07 The article was downloaded on 03/05/2013 at 14:53 Please note that terms and conditions apply. View the table of contents for this issue, or go to the journal homepage for more Home Search Collections Journals About Contact us My IOPscience Formation of nanocrystalline surface layers in various metallic materials by near surface severe plastic deformation Masahide Satoa,*, Nobuhiro Tsujib, Yoritoshi Minaminob, Yuichiro Koizumib aGraduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan bDepartment of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan Received 29 August 2003; revised 29 September 2003; accepted 8 October 2003 Abstract The surface of the various kinds of metallic materials sheets were severely deformed by wire-brushing at ambient temperature to achieve nanocrystalline surface layer. The surface layers of the metallic materials developed by the near surface severe plastic deformation (NS-SPD) were characterized by means of TEM. Nearly equiaxed nanocrystals with grain sizes ranging from 30 to 200 nm were observed in the near surface regions of all the severely scratched metallic materials, which are Ti-added ultra-low carbon interstitial free steel, austenitic stainless steel (SUS304), 99.99 wt.%Al, commercial purity aluminum (A1050 and A1100), Al–Mg alloy (A5083), Al-4 wt.%Cu alloy, OFHC-Cu (C1020), Cu–Zn alloy (C2600) and Pb-1.5%Sn alloy. In case of the 1050-H24 aluminum, the depth of the surface nanocrystalline layer was about 15 mm. It was clarified that wire-brushing is an effective way of NS-SPD, and surface nanocrystallization can be easily

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