Summary
Hexagonal close-packed cobalt-base alloys, if they can be achieved at the required temperatures, could have very desirable creep-strength properties in addition to good wear resistance and low coefficient of friction.
The advantage imparted by the 70° higher melting temperature of cobalt over nickel has as yet not been exploited.
Better knowledge of the effect—beneficial, detrimental, or synergistic—of the various elements present in very small amounts in Cobalt and its alloys is still needed.
Hardening of the cobalt-base alloys essentially by a method other than by precipitation of carbides, although investigated to some extent, has not as yet given satisfactory results. This may be due to the limited knowledge of the metallography of cobalt alloys.
The effect of precipitate or dispersoid on the properties of the material, assuming the very strongest solution-strengthened cobalt matrix is used, will depend not only on the morphology (size, shape, and orientation) but also on stability of these particles. The results of the work on TD-Co alloys are certainly encouraging.
The cobalt-base alloys present an interesting challenge, since there are several possible approaches to improving them.
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This paper is based upon a presentation at the TMS Fall Meeting, 1967, and upon a lecture in a short course on the “High-Temperature Alloys and Superalloys” given by the author at UCLA in Feb. 1968.
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Morral, F.R. The Metallurgy of Cobalt Alloys—A 1968 Review. JOM 20, 52–59 (1968). https://doi.org/10.1007/BF03378733
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DOI: https://doi.org/10.1007/BF03378733