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Microstructure and Texture Evolution during Annealing a Cryo-SPD Processed Al-Alloy with a Nano-Scale Lamellar HAB Grain Structure

G. H. Zahid, Y. Huang and P.B. Prangnell

Acta Mater. 2009;57:3509-3521.

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Abstract

The grain structure and texture evolution during annealing a Al-0.13%Mg submicron grained alloy, deformed by plane strain compression (PSC) at cryogenic temperatures, has been investigated by TEM and EBSD. After deformation the alloy contained a lamellar grain structure with a high angle grain boundary (HAGB) spacing of 190 nm and area fraction of ~ 80%. On annealing the grain structure coarsened and transformed from lamellar to equiaxed. Remarkably, the fraction of low angle grain boundaries (LAGBs) progressively increased during annealing, to ~ 50% above 300 ??C, leading to instability and discontinuous recrystallisation, at higher temperatures. This resulted in a ???bimodal grain structure??? comprised of bands of coarser grains and fine subgrains, arising as a result of the increase in proportion of lower mobility LAGBs. The surprisingly large increase in LAGB fraction on annealing is shown to be related to orientation impingement, originating from the strong texture present after PSC in liquid nitrogen

Bibliographic metadata

Type of resource:
Content type:
Publication type:
Publication form:
Published date:
Language:
eng
Journal title:
Volume:
57
Start page:
3509
End page:
3521
Total:
13
Pagination:
3509-3521
Digital Object Identifier:
10.1016/j.actamat.2009.04.010
Access state:
Active

Institutional metadata

University researcher(s):

Record metadata

Manchester eScholar ID:
uk-ac-man-scw:12692
Created by:
Prangnell, Philip
Created:
23rd September, 2009, 15:01:14
Last modified by:
Prangnell, Philip
Last modified:
7th October, 2014, 22:34:17

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