Abstract
The feasibility of consolidating rapidly solidified MAR M-200 powders by explosive means is demonstrated. MAR M-200 powders produced by the rapid solidification rate (RSR) technique and exhibiting a microdendritic structure were consolidated in an axisymmetric set-up, consisting of a steel pipe (in which the powder was placed) surrounded by explosives. The converging shock waves produced full densification, after optimization of the process parameters. The microindentation hardness showed a dramatic increase: 357 HV in the as-received condition, to 700 HV in the shock-consolidated condition. The substructure was analyzed by TEM, and two distinct regions were identified. The center of the particles exhibited planar arrays of dislocations, stacking-faults, and twin faults characteristic of shock-loaded superalloys, while the melted and re-solidified interfacial layers consisted of a microcrystalline structure with homogeneous composition.
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