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Effect of Heat Treatment at 1150°C on Creep-Rupture Properties of a Fe3Al-Based Alloy

Published online by Cambridge University Press:  22 February 2011

C. G. McKamey ,
Y. Marrero-Santos  and
P. J. Maziasz
C. G. McKamey
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
Y. Marrero-Santos
Affiliation:
Emilio R. Delgado High School, Corozal, PR 00783
P. J. Maziasz
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831
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Abstract

The effects of heat treatment at 1150°C on the creep-rupture properties of a Fe3Al-based alloy were studied. Tests were conducted in air using various test temperatures and stresses. By plotting the data to a power-law equation, the activation energy for creep was determined to be approximately 150 kcal/mole and the creep exponent to be about 8. Optical metallography and scanning electron microscopy of ruptured specimens indicated that failure occurred in a ductile manner by microvoid coalescence at grain boundaries and triple points. Analytical electron microscopy was used to study characteristics of the microstructure and to identify Zr-rich precipitates that formed during heat treatment or creep testing. These precipitates were found to provide strengthening by pinning dislocations and grain boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 364: Symposium L – High-Temperature Ordered Intermetallic Alloys–VI , 1994 , 249
Copyright
Copyright © Materials Research Society 1995

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