Heat-resistant alloys based on intermetallic Co3(Al, W) View Full Text


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Article Info

DATE

2017-04

AUTHORS

E. P. Romanov, N. V. Kazantseva, N. N. Stepanova, S. L. Demakov, D. I. Davydov, D. A. Shishkin

ABSTRACT

The structures and phase compositions of a series of Co–9 at % Al–x at % W alloys (where x = 4.6, 6.8, 8.5, 10.0, 12.6) have been studied. All of them are dominated by the structure γ + γ′, with the content of other phases (the μ phase and the phase D019 based on Co3W) being insignificant. With increasing tungsten content of the alloy (to 10 at % W), the volume fraction of the γ′ phase increases, and so does its degree of long-range order. The alloy that is optimal in structure and mechanical properties has the composition Co–8.2 at % Al–8.5 at % W. The dissolution range of the γ′ phase was determined as 920–1054°C. Young’s moduli of cobalt alloys exceed E of commercial nickel-based superalloys. The samples of the studied alloys are in the ferromagnetic state with a Curie temperature of 870°C. With increasing tungsten content of the alloy, its saturation magnetization decreases and the coercive force increases. The coercive force is minimal in an as-cast sample and increases as it is subjected to deformation or heat treatment. More... »

PAGES

88-91

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0012500817040036

DOI

http://dx.doi.org/10.1134/s0012500817040036

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1085421406


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