Title: Performance characteristics of metallurgical grain refiners in hypoeutectic Al-Si alloys
Abstract: This paper presents grain refining performance data using the Aluminum Association, the preheated Golf Tee mold, and the Calibrated Ring Tests. The grain refining response of two commercial hypoeutectic Al-Si alloys, A356 and A319, as well as commercial purity aluminum (P1020A) are reported. Grain refining master alloys evaluated were 5%Ti-l%B, 2.5%Ti-2.5%B and a recently developed aluminum 6% titanium - carbon alloy. The grain refining responses were developed for each of the three alloys for a range of addition levels, incubation times, stirring actions, and residual titanium contents. Effectiveness of the grain refiner alloys varied depending upon the opportunity and magnitude for each of several mechanisms to be influential. A grain refiner with good intrinsic effectiveness may be more or less effective depending on the interactive time effect for settling, for any change (either positive or negative) of effectiveness with time and for resistance to dissolution. Residual titanium content is most important when a boron free refiner alloy is utilized. For a metallurgical grain refiner with excess boron, residual titanium is of lesser importance.
Publication Year: 1990
Publication Date: 1990-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 1
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