Texture analysis of the transition from slip to grain boundary sliding in a discontinuously recrystallized superplastic aluminum alloy
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Author
Ruano, O.A.
McNelley, T.R.
Pèrez-Prado, M.T.
González-Doncel, G.
Date
2001Metadata
Show full item recordAbstract
Texture and microtexture measurements were correlated with mechanical property data for a
superplastic 5083 aluminum alloy. Prior processing had included an overaging treatment followed by severe
rolling deformation and the as-received material was annealed prior to mechanical testing. Discontinuous
recrystallization by particle-stimulated nucleation during the annealing accounts for a predominantly random
texture, although a weak {100} 0vw> component was present, as well as a random grain boundary disorientation
angle distribution. During elevated temperature deformation under dislocation-creep-controlled conditions,
a distinct 111> fiber component and a relatively weak {100} 001> cube orientation, which are
mutually compatible during uniaxial tensile extension, became apparent in the texture. Also, low-angle boundaries
became evident in the disorientation distribution. In contrast, the random texture component and the
randomness of the disorientation distribution became more evident when the material was deformed under
conditions of grain boundary sliding control of deformation. A transition from dislocation creep to grain
boundary sliding observed in the microtexture measurements of this work may be predicted by treating
constitutive equations for dislocation creep and grain boundary sliding in an additive manner.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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