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Microstructure and Room-Temperature Ductility of Unidirectionally Grown Ni3Al

Published online by Cambridge University Press:  01 January 1992

Toshiyuki Hirano
Affiliation:
National Research Institute for Metals, 1-2-1, Sengen, Tsukuba, Ibaraki 305, Japan
Toshio Mawari
Affiliation:
National Research Institute for Metals, 1-2-1, Sengen, Tsukuba, Ibaraki 305, Japan
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Abstract

The formation mechanism of the columnar-grained stoichiometric Ni3Al by FZ-UDS (unidirectional solidification using a floating zone method) was investigated. The quenched solidification interface showed that Ni3Al and β-NiAl formed simultaneously in the form of lamellar structure at the interface. The β-NiAl dissolved into the Ni3Al matrix during cooling, resulting in the columnar-grained structure of single phase Ni3Al at room temperature. The columnar-grained Ni3Al had a large number of low angle boundaries and exhibited a large tensile ductility. The characteristics of the deformation behavior were also investigated. Slip lines easily transferred acros.s grain boundaries without crack initiation. Deformed bands with many stacking faults were produced by deformation.

Type
Research Article
Copyright
Copyright © Materials Research Society 1995

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Microstructure and Room-Temperature Ductility of Unidirectionally Grown Ni3Al
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