Anomalous grain coarsening behaviour observed in grain-refined aluminium alloy cast using low superheat

Taylor, J. A. and Wang, H. and StJohn, D. H. and Bainbridge, I. F. (2001) Anomalous grain coarsening behaviour observed in grain-refined aluminium alloy cast using low superheat. In: 130th TMS Annual MeetingLight Metals 2001, 11-15 Feb 2001, New Orleans, Louisanna.

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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.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: No evidence of copyright restrictions preventing deposit of Accepted version.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 30 Nov 2007 11:47
Last Modified: 27 Jun 2017 05:26
Uncontrolled Keywords: chemical grain refinement; grain coarsening; superheat casting
Fields of Research : 09 Engineering > 0912 Materials Engineering > 091207 Metals and Alloy Materials
03 Chemical Sciences > 0302 Inorganic Chemistry > 030207 Transition Metal Chemistry
09 Engineering > 0915 Interdisciplinary Engineering > 091505 Heat and Mass Transfer Operations
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering

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