Recent advances in grain refinement of light metals and alloys

Easton, M. A., Qian, M., Prasad, A. and StJohn, D. H. (2016) Recent advances in grain refinement of light metals and alloys. Current Opinion in Solid State and Materials Science, 20 1: 13-24. doi:10.1016/j.cossms.2015.10.001

Author Easton, M. A.
Qian, M.
Prasad, A.
StJohn, D. H.
Title Recent advances in grain refinement of light metals and alloys
Journal name Current Opinion in Solid State and Materials Science   Check publisher's open access policy
ISSN 1359-0286
Publication date 2016-01-04
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.cossms.2015.10.001
Open Access Status Not Open Access
Volume 20
Issue 1
Start page 13
End page 24
Total pages 12
Place of publication Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Formatted abstract
Grain refinement leads, in general, to a decreased tendency to hot tearing, a more dispersed and refined porosity distribution, and improved directional feeding characteristics during solidification. Reduced as-cast grain size can also lead to improved mechanical properties and wrought processing by reducing the recrystallized grain size and achieving a fully recrystallized microstructure. It is now well established that the two key factors controlling grain refinement are the nucleant particles including their potency, size distribution and particle number density, and the rate of development of growth restriction, Q, generated by the alloy chemistry which establishes the undercooling needed to trigger nucleation events and facilitates their survival. The theories underpinning our current understanding of nucleation and grain formation are presented. The application of the latest theories to the light alloys of Al, Mg and Ti is explored as well as their applicability to a range of casting and solidification environments. In addition, processing by the application of physical processes such as external fields and additive manufacturing is discussed. To conclude, the current challenges for the development of reliable grain refining technologies for difficult to refine alloy systems are presented.
Keyword Nucleation
Crystal growth
Ultrasonic treatment
Aluminum alloys
Magnesium alloys
Titanium alloys
Pulsed magneto-oscillation
X-ray radiography
Additive manufacturing
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
Centre for Advanced Imaging Publications
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Citation counts: TR Web of Science Citation Count  Cited 14 times in Thomson Reuters Web of Science Article | Citations
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