期刊
INTERMETALLICS
卷 99, 期 -, 页码 1-7出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2018.05.006
关键词
Metallic glasses; Thermal stability; Thermal properties; Mechanical properties; Casting; Microstructure
资金
- Technology Innovation Program - Ministry of Trade, Industry and Energy (MOTIE, Korea) [10063052]
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT) [2018R1A2B3007167]
- National Research Foundation of Korea (NRF) - Ministry of Education [2017R1A6A3A03005837]
- European Research Council under the Advanced Grant INTELHYB - Next Generation of Complex Metallic Materials in Intelligent Hybrid Structures [ERC-2013-ADG-340025]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10063502] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2018R1A2B3007167, 2017R1A6A3A03005837] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this work, we investigated the effect of boron addition on glass-forming ability and mechanical properties of Co-Cr-Mo-C alloys. The starting alloy was (Co0.65Cr0.13Mo0.22)(80)C-20 derived from the Co65Cr13Mo22 ternary eutectic composition. This alloy is almost fully crystalline and exhibits brittle mechanical properties. Replacing carbon with boron allows obtaining bulk metallic glasses (BMGs) and bulk metallic glass composites. The designed alloys show very high strength (similar to 4100 MPa), wide super-cooled liquid region (similar to 100 K) and large endothermic enthalpy of the supercooled liquid region (similar to 35 J/g), indicating high thermal stability. The electronegativity difference and supercooled liquid region of the present alloys are comparable to rare-earth elements containing BMGs. The physical properties of the present alloys corresponded well with the alloy design strategy based on the unified parameter using the glass transition temperature, fracture strength, and molar volume. Furthermore, we propose the optimum compositional condition for glass formation by controlling the carbon-to-boron ratio and the influence of carbon on phase formation in this alloy system is discussed.
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