Development of novel grain morphology during hot extrusion of magnesium AZ21 alloy

Azeem, M. A. ; Tewari, A. ; Mishra, S. ; Gollapudi, S. ; Ramamurty, U. (2010) Development of novel grain morphology during hot extrusion of magnesium AZ21 alloy Acta Materialia, 58 (5). pp. 1495-1502. ISSN 1359-6454

Full text not available from this repository.

Official URL:

Related URL:


Microstructure and microtexture evolution during static annealing of a hot-extruded AZ21 magnesium alloy was studied. Apart from fine recrystallized equiaxed grains and large elongated deformed grains, a new third kind of abnormal grains that are stacked one after the other in a row parallel to the extrusion direction were observed. The crystallographic misorientation inside these grains was similar to that of the fine recrystallized grains. The large elongated grains exhibited significant in-grain misorientation. A self-consistent mechanistic model was developed to describe the formation of these grain morphologies during dynamic recrystallization (DRX). The texture of pre-extruded material, although lost in DRX, leaves a unique signature which manifests itself in the form of these grain morphologies. The origin of abnormal stacked grains was associated with slow nucleation in pre-extruded grains of a certain orientation. Further annealing resulted in large secondary recrystallized grains with occasional extension twins.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Magnesium Alloy; Extrusion; Dynamic Recrystallization; Annealing; Electron Backscattering Diffraction (EBSD)
ID Code:62551
Deposited On:22 Sep 2011 03:14
Last Modified:22 Sep 2011 03:14

Repository Staff Only: item control page