Dilatancy and rheology at 0-60% solid during equiaxed solidification

Meylan, B., Terzi, S., Gourlay, C. M. and Dahle, A. K. (2011) Dilatancy and rheology at 0-60% solid during equiaxed solidification. Acta Materialia, 59 8: 3091-3101. doi:10.1016/j.actamat.2011.01.049

Author Meylan, B.
Terzi, S.
Gourlay, C. M.
Dahle, A. K.
Title Dilatancy and rheology at 0-60% solid during equiaxed solidification
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2011-05-01
Sub-type Article (original research)
DOI 10.1016/j.actamat.2011.01.049
Open Access Status Not yet assessed
Volume 59
Issue 8
Start page 3091
End page 3101
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 2504 Electronic, Optical and Magnetic Materials
2503 Ceramics and Composites
2507 Polymers and Plastics
2506 Metals and Alloys
Abstract The rheology of an Al-10Cu alloy with four different level of grain refiner was studied by vane rheometry at solid fractions close to the dendrite coherency solid fraction for each composition. The focus is on the influence of grain size, crystal morphology and solid fraction on the development of strength and Reynolds' dilatancy. The results show that the dendrite coherency solid fraction marks the onset of dilatancy in all alloys (i.e. the semi-solid alloys expand when sheared after dendrite coherency). The amount of dilatancy increases with increasing solid fraction and grain size. The influence of grain size is linked to the formation of shear bands within the samples where most of the volume change occurs. These bands are approximately 10-15 mean grains wide. The influence of crystal morphology on the development of strength after dendrite coherency and dilatancy is low, but it strongly influences the dendrite coherency solid fractions in the four alloys.
Keyword Aluminium alloys
Deformation microstructure
Granular materials
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
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