Understanding rheology and solidification of light alloys

Meylan, B., Gourlay, C. M. and Dahle, A. K. (2008). Understanding rheology and solidification of light alloys. In: 2009 Materials and AustCeram Conference, MAC 2009. 2009 Materials and AustCeram Conference, MAC 2009, Gold Coast, QLD, (190-193). 1 - 3 July 2009.

Author Meylan, B.
Gourlay, C. M.
Dahle, A. K.
Title of paper Understanding rheology and solidification of light alloys
Conference name 2009 Materials and AustCeram Conference, MAC 2009
Conference location Gold Coast, QLD
Conference dates 1 - 3 July 2009
Proceedings title 2009 Materials and AustCeram Conference, MAC 2009
Journal name Materials Forum
Place of Publication North Melbourne, VIC Australia
Publisher Institute of Materials Engineering Australasia Pty. Ltd.
Publication Year 2008
Year available 2008
Sub-type Fully published paper
Open Access Status
ISSN 0883-2900
Volume 34
Start page 190
End page 193
Total pages 4
Collection year 2009
Language eng
Abstract/Summary During solidification of equiaxed dendritic alloys, the rheological behaviour changes from that of a fully liquid to a solid across a range of temperatures and therefore occurs over a significant period of time. Within the solidification range there are a number of characteristic transitions delineating different rheological responses. In commercial casting processes, solidifying metals usually experience deformation as they are subjected to stresses, thermal contraction, solidification shrinkage or flow. The deformation of partially solid alloys can lead to a variety of casting defects including hot tearing, microshrinkage porosity and many forms of macrosegregation. With the increased requirements of cast light metal components, there is a need for an improved understanding of the phenomena occurring during solidification. The rheology at high solid fraction where hot tearing occurs, usually fs > 0.9, has received much attention and is reasonably well understood. Further, rheology of globular alloys for semi-solid metal processing with solid fractions fs∼ 0.5, where the semi-solid behaves as a suspension, is also well investigated. However, much less work has been conducted to understand the rheology of equiaxed dendritic alloys during solidification in order to understand defect formation and its relation to the mechanical response of the alloys. This paper reports on the relationship between rheology and microstructural development during solidification of light metals for intermediate solid fractions where the partially solid alloys behave like granular materials. Further, the relation between defect formation and its relation to microstructure development is discussed.
Subjects 2500 Materials Science
3104 Condensed Matter Physics
2210 Mechanical Engineering
2211 Mechanics of Materials
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Conference Paper
Collection: School of Mechanical & Mining Engineering Publications
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