Shear mechanisms at 0-50% solid during equiaxed dendritic solidification of an AZ91 magnesium alloy

Gourlay, C., Meylan, B. and Dahle, A.K. (2008) Shear mechanisms at 0-50% solid during equiaxed dendritic solidification of an AZ91 magnesium alloy. Acta Materialia, 56 14: 3403-3413. doi:10.1016/j.actamat.2008.03.020


Author Gourlay, C.
Meylan, B.
Dahle, A.K.
Title Shear mechanisms at 0-50% solid during equiaxed dendritic solidification of an AZ91 magnesium alloy
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2008-08-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.actamat.2008.03.020
Open Access Status Not yet assessed
Volume 56
Issue 14
Start page 3403
End page 3413
Total pages 11
Editor Mahajan, S.
Place of publication United Kingdom
Publisher Pergamon
Language eng
Subject C1
861203 Metal Castings
091207 Metals and Alloy Materials
Abstract The rheology of equiaxed solidifying alloys containing 0-50% solid has been studied by vane rheometry. We focus on the incipient motion and subsequent flow mechanisms of quiescent solidifying microstructures. It is demonstrated that, once the growing crystals have impinged, the rheology can be interpreted within the framework of saturated compacted granular materials with little intercrystal cohesion. The material expands in response to shear and deforms primarily by Reynolds' dilatancy-enabled crystal rearrangement. Dilatancy leads to strain localisation in dilatant shear bands shortly after crystal impingement and is proposed to cause the initiation of cracks in the expanding regions between crystals at higher solid fraction.
Keyword Dilatancy
Granular
Localization
Rheology
Semi-solid
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mechanical & Mining Engineering Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 32 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 35 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Thu, 26 Mar 2009, 21:34:25 EST by Sally Beard on behalf of Materials