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Improvement of Room Temperature Ductility of Ni3Al by Unidirectional Solidification

Published online by Cambridge University Press:  26 February 2011

Toshiyuki Hirano ,
Sea-Sung Chung ,
Yoshinao Mishima  and
Tomoo Suzuki
Toshiyuki Hirano
Affiliation:
Nat.Res. Inst. for Metals, 1–2–1, Sengen, Tsukuba, Ibaraki 305, Japan
Sea-Sung Chung
Affiliation:
Res. Lab. of Precision Machinery and Electronics, Tokyo Inst. of Tech., 4259 Nagatsuta, Midori-ku, Yokohama 227, Japan
Yoshinao Mishima
Affiliation:
Res. Lab. of Precision Machinery and Electronics, Tokyo Inst. of Tech., 4259 Nagatsuta, Midori-ku, Yokohama 227, Japan
Tomoo Suzuki
Affiliation:
Dept. of Metall. Eng., Tokyo Inst. Tech., Ookayama, Meguroku, Tokyo 152, Japan
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Abstract

We present the new promising method to improve the ductility of intermetallic compound, Ni3Al. Stoichiometric and Alrich Ni3A1 were unidirectionally grown at the growth rate of 24 mm/h by a floating zone method (FZ-UDS). The stoichiometric Ni3Al had a columnar-grained and single phase structure, whereas the Al-rich Ni3Al had a Ni3Al matrix with martensite-like precipitates. These alloys exhibited a large tensile elongation along the growth direction at room temperature. Fracture mode is a complete transgranular fracture in the stoichiometric Ni 3Al alloy, and a mixture of transgranular fracture of the matrix and cleavage of the martensite-like precipitates with cracking at the phase boundary in the Al-rich Ni3Al alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 635
Copyright
Copyright © Materials Research Society 1991

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References

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