Microstructural study of the consolidation of Fe and Cu nanocrystalline powders Conference Paper uri icon

abstract

  • This study is a comparative analysis of the consolidation process between micrometric and nanometric Fe and Cu powders. Nanometric powders of Fe and Cu with equivalent particle size distributions were prepared by levitation melting in liquid nitrogen. TEM analysis of the as-prepared nanopowders shows for Cu planar defects, which could be twins, in a substantial fraction of the particles whilst the Fe particles does not show any defect. Die-compaction pressing showed a remarkable difference in density and calculated yield strength between micrometric and nanometric bulk specimens. The evolution of the defects was studied for both nanopowders as a function of pressure. These changes are discussed in relation to the observed consolidation and mechanical behaviour.

publication date

  • 1996-01-01