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Room Temperature Fracture of FeCo

Published online by Cambridge University Press:  01 January 1992

L. Zhao ,
I. Baker  and
E. P. George
L. Zhao
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
I. Baker
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755
E. P. George
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

FeCo is a B2 intermetallic compound which undergoes an order-disorder transformation. In this paper, the effects of changes in both constitutional and thermal disorder on the room temperature fracture of FeCo are presented. Tensile tests were performed on three compositions of FeCo, Fe30Co70. Fe50Co50 and Fe70Co30. The resulting fracture surfaces were examined by SEM and the grain boundary chemistry was investigated by Auger electron spectroscopy, AES. Ordered Fe50Co50 and Fe70Co30 were very brittle, fracture occurring before yielding, with intergranular fracture occurring in most grains. In contrast, ordered Fe30Co70 showed about 18% elongation and exhibited a dimple-type fracture. It was also found that disordering improved the ductility of each composition but had little influence on the fracture mode. AES showed that a low level of sulfur segregation was present at the grain boundaries, suggesting that sulfur segregation alone was not responsible for the brittle behavior of the ordered alloys.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 288: Symposium L – High-Temperature Ordered Intermetallic Alloys V , 1992 , 501
Copyright
Copyright © Materials Research Society 1995

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References

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