Paper Title:
Microstructural Evolution During Superplastic Forming of Al-Li 8090 Alloy
  Abstract

Commercial grade AA8090 Al–Li alloy sheet contained three layers of distinct microstructural features along thickness direction. The surface layer contained well recrystallized equiaxed grains with higher fraction of T {4 4 11}, Cu {1 1 2}, H {0 0 1} and CH {0 0 1} texture components whereas middle layer contained unrecrystallized elongated grains with higher fraction of brass {0 1 1}, CG {0 2 1} and goss{0 1 1} texture components. Superplastic forming of the separated surface and middle layers was carried out at constant pressure. Microstructure and texture evolution was studied at different location of the formed bulge. The extent of texturing or anisotropy was calculated from standard deviation of texture estimated normal anisotropy (R) values, Rstdev. At all conditions, in both the surface and middle layers, the texture randomization was found to be more at the apex than that at the edge of the bulge. The overall reduction in texturing was predominantly accompanied by weakening in strong texture components and strengthening in the weaker ones.

  Info
Periodical
Materials Science Forum (Volumes 702-703)
Chapter
Chapter 2: Deformation
Edited by
Asim Tewari, Satyam Suwas, Dinesh Srivastava, Indradev Samajdar and Arunansu Haldar
Pages
374-377
DOI
10.4028/www.scientific.net/MSF.702-703.374
Citation
V. Pancholi, B.P. Kashyap, "Microstructural Evolution During Superplastic Forming of Al-Li 8090 Alloy", Materials Science Forum, Vols. 702-703, pp. 374-377, 2012
Online since
December 2011
Export
Price
$32.00
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