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Microstructure in Rapidly Quenched Al-Ti,Al-B and Al-Ti-B Alloys

Published online by Cambridge University Press:  26 February 2011

A. Majumdar ,
R. H. Mair  and
B. C. Muddle
A. Majumdar
Affiliation:
Department of Materials Engineering, Monash University, Clayton, Victoria, Australia 3168
R. H. Mair
Affiliation:
Department of Materials Engineering, Monash University, Clayton, Victoria, Australia 3168
B. C. Muddle
Affiliation:
Department of Materials Engineering, Monash University, Clayton, Victoria, Australia 3168
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Abstract

Rapidly quenched ribbons (˜50m thickness) of Al-5wt.%Ti, Al-lwt.%B and a range of Al-Ti-B alloys have been produced by melt spinning under He atmosphere and the microstructures of the ribbons, following solidification and post-solidification heat treatment, characterized using analytical electron microscopy. In the Al-5Ti alloy, the coarse equilibrium primary phase (b.c.t. Al3 Ti) that is observed following conventional casting is replaced by fine (0.1–0. 2μm), cuboidal particles of a metastable cubic (Ll2) Al3Ti in melt-spun ribbon. These metastable particles form directly from the melt and act as nucleation sites for the solid solution which subsequently forms. A refined microstructure with an average grain size of 1–2μm results. A supersaturation of Ti is retained in matrix solid solution following solidification and a variety of solid state precipitate forms, including fine dispersions of coherent, metastable Al3 Ti particles, is observed to emerge during post-solidification heat treatment. For the Al-1B alloy, the coarse distribution of primary AlB2 particles in a chill-cast ingot is replaced by a fine, uniform dispersion of the metastable boride, α-AlB12, in the melt-spun ribbon. Attempts to induce a refined boride dispersion in melt-spun Al-Ti-B alloys have proved largely unsuccessful.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 80: Symposium G – Science and Technology of Rapidly Quenched Alloys , 1986 , 253
Copyright
Copyright © Materials Research Society 1987

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