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Erschienen in: Metallurgical and Materials Transactions A 2/2008

01.02.2008

Microstructure, Tensile, and Creep Behavior of Boron-Modified Ti-15Al-33Nb (at.%)

verfasst von: C.J. Cowen, C.J. Boehlert

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 2/2008

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Abstract

The effect of boron on the microstructure, tensile, and creep behavior of a Ti-15Al-33Nb (at. pct) alloy was investigated. In addition to the normal constituent phases present in the unmodified alloy, the boron-modified alloys contained borides enriched in titanium and niobium. These borides made up to 9 pct of the volume and were present in the form of needles/laths. Boron additions of 5 at. pct resulted in significant strengthening and stiffening and reduced elongation-to-failure. Smaller boron additions of 0.5 at. pct did not as significantly impact the RT tensile properties, but reduced the 650 °C yield strength by 45 pct. Constant load, tensile-creep experiments were performed in the stress range of 150 to 400 MPa and the temperature range of 650 °C to 710 °C, in both air and vacuum environments. The addition of 5 at. pct boron significantly improved the creep resistance, whereas the addition of 0.5 at. pct boron degraded the creep resistance. In-situ tensile-creep experiments indicated that localized grain boundary cracking was prevalent at the prior-β grain boundaries.

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Fußnoten
1
All compositions will be given in atomic percent unless otherwise stated.
 
2
JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.
 
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Metadaten
Titel
Microstructure, Tensile, and Creep Behavior of Boron-Modified Ti-15Al-33Nb (at.%)
verfasst von
C.J. Cowen
C.J. Boehlert
Publikationsdatum
01.02.2008
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 2/2008
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-007-9392-2

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