Superplastic GBS Constitutive Equation Incorporating Average Grain Misorientation Dependence

Fernando Carreño; Alberto Orozco-Caballero

doi:10.4028/www.scientific.net/MSF.941.1501

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HomeMaterials Science ForumMaterials Science Forum Vol. 941Superplastic GBS Constitutive Equation...

Superplastic GBS Constitutive Equation Incorporating Average Grain Misorientation Dependence

Abstract:

Recent Al7075 severe friction stir processing (FSP) data gave new insights regarding the relationship among processing, microstructure and high temperature behaviour. Grain boundary sliding, GBS, usually operates with fine, equiaxed and highly misoriented grains although, so far, the variable misorientation is missing from the constitutive equation. A collection of very fine microstructures comprising various grain size and misorientation values is employed to evidence the relative importance of grain size vs misorientation in the superplastic behaviour of the processed alloy. This relationship is included into a new GBS constitutive equation incorporating the average misorientation as a variable.

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Periodical:

Materials Science Forum (Volume 941)

Pages:

1501-1506

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.941.1501

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Online since:

December 2018

Authors:

Fernando Carreño*, Alberto Orozco-Caballero

Keywords:

Constitutive Equation, Friction Stir Processing (FSP), Grain Boundary Sliding, Grain Misorientation, Grain Refinement, Superplasticity

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