Journal
MATERIALS TRANSACTIONS
Volume 55, Issue 1, Pages 99-105Publisher
JAPAN INST METALS
DOI: 10.2320/matertrans.MA201303
Keywords
cobalt chromium molybdenum powder; severe plastic deformation; harmonic structure; mechanical properties
Funding
- Japan Science and Technology Agency (JST)
- MEXT, Japan [22102004]
- Grants-in-Aid for Scientific Research [22102004] Funding Source: KAKEN
Ask authors/readers for more resources
Harmonic structure is a recently introduced concept for material microstructure design. It is essentially a bimodal microstructure in which deliberately introduced structural heterogeneity has a specific order: interconnected network of ultra-fine grained (UFG) regions, called shell area, and coarse-grained regions called core area. Such microstructural features dictate a unique set of properties to the Harmonic-structured materials. The present paper deals with the application of harmonic structure design to biomedical Co-Cr-Mo alloys for improved mechanical properties. In the present work, it has been demonstrated that full density Co-Cr-Mo alloy compacts with harmonic structure can be successfully prepared by controlled mechanical milling followed by spark plasma sintering of the pre-alloyed powders at 1323 K for 3.6 ks. Sintered compacts exhibited an excellent combination of strength and ductility. Moreover, it has been also shown that the mechanical properties depend strongly on the volume fraction of the inter-connected three-dimensional network of fine-grained regions, i.e., shell volume fraction. In addition, the plastic deformation of harmonic structure Co-Cr-Mo alloy also led to alpha-FCC to epsilon-HCP allotropic transformation. Therefore, the application of harmonic structure design leads to the new generation microstructure of biomedical Co-Cr-Mo alloys, which demonstrates outstanding mechanical properties compared to conventional materials.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available