Journal
MATERIALS SCIENCE & ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
Volume 58, Issue -, Pages 1008-1015Publisher
ELSEVIER
DOI: 10.1016/j.msec.2015.09.055
Keywords
Co-Cr-Mo alloy; Powder metallurgy; Harmonic structure; Bimodal grain structure; Deformation mechanism; Severe plastic deformation
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Funding
- Japan Science and Technology Agency (JST) under Collaborative Research Based on Industrial Demand Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials
- MEXT, Japan [22102004]
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In the present work, Co-Cr-Mo alloy compacts with a unique bimodal microstructural design, harmonic structure design, were successfully prepared via a powder metallurgy route consisting of controlled mechanical milling of pre-alloyed powders followed by spark plasma sintering. The harmonic structured Co-Cr-Mo alloy with bimodal grain size distribution exhibited relatively higher strength together with higher ductility as compared to the coarse-grained specimens. The harmonic Co-Cr-Mo alloy exhibited a very complex deformation behavior wherein it was found that the higher strength and the high retained ductility are derived from fine-grained shell and coarse-grained core regions, respectively. Finally, it was observed that the peculiar spatial/topological arrangement of stronger fine-grained and ductile coarse-grained regions in the harmonic structure promotes uniformity of strain distribution, leading to improved mechanical properties by suppressing the localized plastic deformation during straining. (C) 2015 Elsevier B.V. All rights reserved.
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