Effect of Nitrogen on Microstructure of Porous CoCrMo Alloy Compacts for Biomedical Applications

Abstract:

Porous Co-29Cr-6Mo alloy compacts were fabricated and their microstructures were examined. The Co-29Cr-6Mo alloy powders were atomized by using Plasma Rotating Electrode Process (PREP) in an Ar atmosphere. These powders were hot-pressed at 1223 K in Ar or nitrogen and annealed at 1473 K in vacuum or nitrogen. X-ray analysis revealed that the γ phase (f.c.c.) mostly exists in the compact hot-pressed in nitrogen although the ε phase (h.c.p.) is dominant in the compact hot-pressed in Ar. In addition, precipitates are observed at the interdendritic region in the compact hot-pressed in nitrogen. These results suggest that the Co-29Cr-6Mo alloy powders react with nitrogen to stabilize the γ phase. Accordingly, the constituent phase in the Co-29Cr-6Mo alloy is strongly affected by the atmosphere during hot-pressing.

• Periodical: Materials Science Forum (Volumes 561-565)
• Pages: 1501-1504
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.561-565.1501
• Online since: October 2007
• Authors: Naoyuki Nomura, Mariko Abe, Sang Hak Lee, Akihiko Chiba
• Keywords: Cobalt-Chromium-Molybdenum Alloy, Nitrogen, Porous Compact

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