Fe Base Ferritic Alloys with Ultra-High Strength Consolidated via Hot Equal Channel Angular Extrusion

摘要

Consolidation of nanocrystalline materials produced by mechanical alloying without the degradationproperties has been a challenge in the past, in part due to the extreme hardness of the as-milledparticulates. However, recent demonstrations of equal channel angular extrusion or ECAE, involvingtemperature, high shear and high pressure have shown promise for bonding high strength particulatematerials. Here, we will report the ability of multi-pass high temperature ECAE to produce fully dense andwell-bonded high strength bulk Ferritic alloys from nanocrystalline Fe-Ni-Zr powder precursors. Themicrostructural evolution as a function of processing temperature was investigated in terms of graingrowth, hardness, and shear punch tests. Results revealed that despite the grain growth to the micronscale, after extrusion at high temperatures, the consolidated alloys demonstrate high strength.