期刊
SCIENTIFIC REPORTS
卷 7, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep39959
关键词
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资金
- Technology Innovation Program - Ministry of Trade, Industry and Energy (MOTIE, Korea) [10063052]
- National Research Foundation of Korea [NRF-2015K2A2A2002583]
- Ministry of Trade, Industry & Energy, Republic of Korea [20142020103910]
- German Science Foundation (DFG) under the Leibniz Program [EC 111/26-1]
- European Research Council under the ERC Advanced Grant INTELHYB [ERC-2013-ADG-340025]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20142020103910] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In the present study, the microstructural evolution and the modulation of the mechanical properties have been investigated for a Co-Cr-Mo (CCM) ternary eutectic alloy by addition of a small amount of copper (0.5 and 1 at.%). The microstructural observations reveal a distinct dissimilarity in the eutectic structure such as a broken lamellar structure and a well-aligned lamellar structure and an increasing volume fraction of Co lamellae as increasing amount of copper addition. This microstructural evolution leads to improved plasticity from 1% to 10% without the typical tradeoff between the overall strength and compressive plasticity. Moreover, investigation of the fractured samples indicates that the CCMCu alloy exhibits higher plastic deformability and combinatorial mechanisms for improved plastic behavior. The improved plasticity of CCMCu alloys originates from several deformation mechanisms; i) slip, ii) deformation twinning, iii) strain-induced transformation and iv) shear banding. These results reveal that the mechanical properties of eutectic alloys in the Co-Cr-Mo system can be ameliorated by micro-alloying such as Cu addition.
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