Anomalous grain coarsening behaviour observed in grain-refined aluminium alloy cast using low superheat
Paper
Paper/Presentation Title | Anomalous grain coarsening behaviour observed in grain-refined aluminium alloy cast using low superheat |
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Presentation Type | Paper |
Authors | Taylor, J. A. (Author), Wang, H. (Author), StJohn, D. H. (Author) and Bainbridge, I. F. (Author) |
Editors | Anjier, Joseph L. |
Journal or Proceedings Title | Light Metals 2001 |
Number of Pages | 7 |
Year | 2001 |
Place of Publication | Warrendale, PA. United States |
ISBN | 9780873394802 |
Web Address (URL) of Paper | https://books.google.com.au/books/about/Light_Metals_2001.html?id=UboxPQAACAAJ&redir_esc=y |
Conference/Event | 130th TMS Annual MeetingLight Metals 2001 |
Event Details | 130th TMS Annual MeetingLight Metals 2001 Event Date 11 to end of 15 Feb 2001 Event Location New Orleans, Louisanna |
Abstract | Chemical grain refinement of aluminium alloys has been commercially practiced for many years. Low superheat casting has also been recognised as a means of inducing grain refinement in aluminium alloys. However, the present study indicates that when both techniques are used in combination, the result is not always a further improvement in overall refinement, in fact, even grain coarsening can occur. Grain sizes were measured in test castings made from 356, 6063 and 2024 alloys poured at low superheats using various grain refiners (Al-5Ti-1B, Al-6Ti and Al-4B) at a range of addition levels. High addition levels of the Al-Ti-B and Al-Ti grain refiners sometimes yielded marginal improvements in grain size compared to non grain-refined low superheat samples. However, grain coarsening was also observed particularly at the lower addition levels of the Al-B master alloy. The mechanism proposed for this latter phenomenon carries implications for impurity control and recycling. |
Keywords | chemical grain refinement; grain coarsening; superheat casting |
ANZSRC Field of Research 2020 | 401607. Metals and alloy materials |
340211. Transition metal chemistry | |
401205. Experimental methods in fluid flow, heat and mass transfer | |
Public Notes | No evidence of copyright restrictions preventing deposit of Accepted version. |
Byline Affiliations | University of Queensland |
CAST Co-operative Research Centre, Australia | |
Direct Chill Casting, Australia | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q068q/anomalous-grain-coarsening-behaviour-observed-in-grain-refined-aluminium-alloy-cast-using-low-superheat
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