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Microstructures of Ni3 Al Rapidly Solidified by Hammer-Anvil Technique

Published online by Cambridge University Press:  28 February 2011

Yoshinao Mishima ,
Shirou Sasaki  and
Tomoo Suzuki
Yoshinao Mishima
Affiliation:
Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology, Nagatsuta, Midori-ku, Yokohama 227, Japan
Shirou Sasaki
Affiliation:
Graduate Student, Department of Materials Science and Engineering, Tokyo Institute of Technology, Nagatsuta. Now with Showa Denko K.K., Shimokagemori, Chichibu, Saitama 369–18, Japan
Tomoo Suzuki
Affiliation:
Department of Metallurgical Engineering, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152, Japan
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Abstract

The Hammer-Anvil technique is employed for the rapid solidification of Ni3Al in the present work. The effect of off-stoichiometry on the change in the microstructure in the quenched alloy is examined for compositions within the L12 phase field at equilibrium. It is shown that non-equilibrium phases of various morphologies appear with fine grains of Ll2 phase, which have never been reported for the compound rapidly solidified by the roll techniques. With increasing aluminum concentration and with increase in cooling rate, the latter being judged by the difference in the thickness of the quenched foil, the fraction of the non-equilibrium phases appearing is found to increase giving more complex microstructure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 186: Symposium I – Alloy Phase Stability and Design , 1990 , 335
Copyright
Copyright © Materials Research Society 1991

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