Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 544, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnoncrysol.2020.120194
Keywords
Amorphous materials; Bulk metallic glasses; Mechanical properties
Funding
- National Natural Science Foundation of China [51671162]
- Fundamental Research Funds for the Central Universities [XDJK2019B062]
- Natural Science Foundation of Chongqing, China [cstc2019jcyj-msxmX0059]
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In this work, a family of ternary Co100-x-yWxBy (at.%, x=15 similar to 30, y=11 similar to 19) bulk metallic glasses (BMGs) with near-recorded ultrahigh strength up to 6 GPa was successfully developed. With extremely high tungsten content, the Co-W-B BMGs show very high glass transition temperature of 850-975 K and high density of 11.13-12.43 g/cm(3), which are much higher than most of Co-based BMGs previously reported. Moreover, the glassy alloys exhibit a good glass-forming ability with critical diameter of 2 mm in diameter and a wide supercooled liquid region of over 80 K. Furthermore, these BMGs possess ultrahigh strength of 5.5-6 GPa, high Young's modulus of 243.6-273.1 GPa, high specific strength of similar to 500 Nm/g and obvious plastic strain of 0.5-2.6 %, respectively. The novel ternary Co-based BMGs with outstanding mechanical properties and less components are promising as structural materials and model system for theoretical research.
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