Rapid Solidification and Dynamic Compaction of Ni-Base Superalloy Powders

Abstract

Sunmary A Ni-base su,peralloy containing 13%Al-9%Mo-Z%Ta (in at.%) has been characterized in both the rapidly solidified condition and after dynamic compaction. Dynamically compacted specimens were examined in the ascompacted condition and observations related to current theories of interparticle boniding. In addition, the recrystallization behavior of the compacted material at relatively low temperature (~0.5-0.75 T,) was investigated.

Superplastic MAR-M247 LC superalloy made by compaction of rapidly solidified ribbons

“…A duplex grain structure consisting of y +y' and y' is a common feature of the dynamical densification process, as observed in the extruded powder metallurgy alloys IN 100 and Ni-13AI-9Mo-2Ta recrystallized after dynamic compaction. 4 It is necessary to suppress excessive structure, coarsening during consolidation so that subsequent superplastic forming can be carried out, or the refined structure utilized for service at immediate temperatures. This observation indicates that the fine grain size is maintained during the extrusion.…”