Hostname: page-component-8448b6f56d-t5pn6 Total loading time: 0 Render date: 2024-04-23T10:59:26.923Z Has data issue: false hasContentIssue false
  • English
  • Français

Growth and Thermal Stability of γ/γ'-α Eutectic Composite

Published online by Cambridge University Press:  15 February 2011

Y. G. Nakagawa  and
M. Nemoto
Y. G. Nakagawa
Affiliation:
Ishikawajima-Harima Heavy Industries Co., Ltd.Tokyo, Japan
M. Nemoto
Affiliation:
Tohoku University, Sendai, Japan
Get access

Abstract

The paper summarizes the results of a series of investigations carried out for a γ/γ'-α(Ni-Al-Mo) eutectic. The subjects include a thermal analysis of the composite growth in a high temperature gradient provided by a fluidized bed cooling, a study of defect formation such as the banding structure at unstable thermal conditions, Tem observation and phase identification for micro-phases existed in an as-growth state as well as phases produced after various quench and aging treatments, and an evaluation of the composite thermal stability in terms of the microstructures and the high temperature strength. The fluidized bed placed beneath a melting furnace was proved to establish a temperature gradient equivalent to the liquid metal cooling, and to promote a stable steady growth of the composites without bandings. Quenching the eutectic above a peritectoid temperature diminished the blocky γ'. The subsequent aging treatments induced small Mo platelets above 830°C and blow the temperature a metastable Ni2Mo particle precipitation in the γ phase causing appreciable composite hardening. The creep rupture strength, however, was reduced by the heat treatment due to δ-NiMo phases precipitated during the test in consumption of the Mo fibers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 12 , 1981 , 143
Copyright
Copyright © Materials Research Society 1982

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

(1) Lemkey, F.D., “Development of Directionally Solidified Eutectic Nickel and Cobalt Alloys”, Final Report, Contract N62269-75-C-0129, Naval Air Systems Command Dec. (1975)Google Scholar
(2) Henry, M.F., Jackson, M.R., Gigliotti, M.F.X. and Nelson, P.B., “Evaluation of An Advanced Directionally Solidified γ/γ'-αMo Eutectic alloy”, Report No. NASA CR-159416, Jan. (1979)Google Scholar
(3) Nakagawa, Y.G., Murakami, K., Ohtomo, A. and Saiga, Y., “Directional Growth of Eutectic Composite by Fluidized Bed Quenching”, Transactions ISIJ, 20 (1980) pp. 614-623 CrossRefGoogle Scholar
(4) Nemoto, M., Honda, T., Nakagawa, Y.G., Saiga, Y. and Suto, H., “Microstructural Studies of a Ni-Al-Mo Directionally Solidified Eutectic Composite”, Transactions JIM, 21(8)(1980) pp. 495-504 CrossRefGoogle Scholar
(5) Nemoto, M., Honda, T., Nakagawa, Y.G., Saiga, Y. and Suto, H., “Precipitation in a Ni-Al-Mo Directionally Solidified Eutectic Composite”, Transactions JIM, 21(8)(1980), pp. 505-514 CrossRefGoogle Scholar
(6) Yoshizawa, H., Wakashima, K., Umekawa, S. and Suzuki, T., “Elevated Temperature Stability of the phases In a γ(Ni)/γ'(Ni3Al)-α(Mo) Aligned Eutectic Composite”, Scripta Metallurqica, 15(1981), pp. 1091-1096 CrossRefGoogle Scholar