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http://dx.doi.org/10.5228/KSPP.2002.11.3.255

Superplastic Deformation Behavior of ECA dressed 7010 Al Alloy  

김지식 (상주대학교 신소재공학과)
Publication Information
Transactions of Materials Processing / v.11, no.3, 2002 , pp. 255-261 More about this Journal
Abstract
The grain size of 7010 Al alloy was refined to submicrometer level by using equal channel angular pressing (ECAP) and additional warm rolling. The mechanisms of grain refinement in ECAP process were fragmentation of coarse grain to ultra fine subgrains after a few passes and continuous recrystallization of the subgrains with the increase o( passes. Because of ultrafine grain size, essentially low temperature and high strain rate superplasticity was observed after ECAP process and warm rolling to form a sheet metal. The maximum elongation of 700% was obtained for an ECA pressed specimen after IS passes without warm rolling at $450^{\circ}C$ with strain rate of 5x$10^{-3}$/sec.
Keywords
Equal Channel Angular Pressing (ECAP); Ultra Fine Grain; Low Temperature And High Strain Rate Superplasticity; Electron Back Scattered Diffraction (EBSD); Warm Rolling;
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