Abstract
The ageing characteristics of a commercial Co-Cr-Mo-C alloy after solution treatment were investigated using optical and electron microscopy. An M23C6-type carbide was identified by X-ray and electron diffraction after ageing treatments between 650 and 1150° C. Nucleation and growth of this carbide took place on intrinsic stacking faults by Suzuki segregation in the cobalt matrix. High stacking-fault densities gave rise to intragranular striations which were visible after etching once precipitation had occurred. Ageing temperatures of 925° C and above increased the stability of the f c c cobalt matrix and led to precipitation on undissociated dislocations. Grain-boundary carbides were evident at all ageing temperatures.
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Taylor, R.N.J., Waterhouse, R.B. The metallography of a cobalt-based implant alloy after solution treatment and ageing. J Mater Sci 21, 1990–1996 (1986). https://doi.org/10.1007/BF00547938
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DOI: https://doi.org/10.1007/BF00547938