Neutron diffraction measurements of residual strains in tungsten fiber-reinforced Kanthal composites
- Tufts Univ., Medford, MA (United States). Dept. of Mechanical Engineering
- Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
FeAl and FeCrAl alloys containing small quantities of Y, such as Kanthal, have been shown to exhibit outstanding high-temperature oxidation/corrosion resistance and therefore have great potential for use as corrosion-resistant cladding in a variety of high-temperature structural applications. Recently, several such FeAl alloys have been developed with improved mechanical behavior and weldability. In order to further enhance strength, tungsten fiber-reinforced Kanthal metal matrix composites have been developed for possible applications in space structures. However, thermal residual stresses are developed as a result of the mismatch of the coefficients of thermal expansion between those of the tungsten fibers and the Kanthal matrix during post-fabrication cooldown. These stresses can lead to matrix cracking, thereby deteriorating the aggregate mechanical properties of the composites. To develop composites with reliable and enhanced properties, it is necessary to understand the nature and the magnitude of these residual stresses. High-resolution neutron powder diffraction was used in this study to investigate the residual strains and stresses at room temperature in W/Kanthal composites containing different volume fractions of tungsten fibers.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 230769
- Journal Information:
- Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 34; ISSN 1359-6462; ISSN XZ503X
- Country of Publication:
- United States
- Language:
- English
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