Effects and mechanisms of grain refinement in aluminium alloys |
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Authors: | K T Kashyap T Chandrashekar |
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Affiliation: | (1) Central Laboratory, Foundry and Forge Division, Hindustan Aeronautics Ltd., 560 017 Bangalore, India;(2) Department of Mechanical Engineering, M.S. Ramaiah Institute of Technology, 560 054 Bangalore, India |
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Abstract: | Grain refinement plays a crucial role in improving characteristics and properties of cast and wrought aluminium alloys. Generally
Al-Ti and Al-Ti-B master alloys are added to the aluminium alloys to grain refine the solidified product. The mechanism of
grain refinement is of considerable controversy in the scientific literature. The nucleant effects i.e. which particle and
its characteristics nucleate α-Al, has been the subject of intensive research. Lately the solute effect i.e. the effect of
dissolved titanium on grain refinement, has come into forefront of grain refinement research. The present paper attempts to
review the literature on the nucleant effects and solute effects on grain refinement and addresses the importance of dissolved
titanium in promoting nucleation of α-Al on nucleant particles. |
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Keywords: | Grain refinement nucleant effects solute effects Al-Ti-B master alloy |
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