1. A comparative study of glass-forming ability, crystallization kinetics and mechanical properties of Zr55Co25Al20 and Zr52Co25Al23 bulk metallic glasses.
- Author
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Dong, Q., Pan, Y.J., Tan, J., Qin, X.M., Li, C.J., Gao, P., Feng, Z.X., Calin, M., and Eckert, J.
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ZIRCONIUM compounds , *CRYSTALLIZATION kinetics , *METALLIC glasses , *MECHANICAL properties of metals , *DOPING agents (Chemistry) - Abstract
Abstract Most bulk metallic glass systems with high glass-forming ability are doped with precious metal(s) or toxic element(s), like palladium and beryllium, leading to relatively high cost or low safety in use. In this work, the glass-forming ability, crystallization kinetics and mechanical properties of the Zr 55 Co 25 Al 20 and Zr 52 Co 25 Al 23 bulk metallic glasses prepared by water-cooled copper mold suction casting are investigated in detail. The results show that Zr 52 Co 25 Al 23 has a wider supercooled liquid region, a higher thermal stability and a higher glass-forming ability than the Zr 55 Co 25 Al 20 amorphous alloy. At the same time, Zr 52 Co 25 Al 23 has a higher activation energy of crystallization than Zr 55 Co 25 Al 20 amorphous alloy, indicating that Zr 52 Co 25 Al 23 has a higher resistance to crystallization than Zr 55 Co 25 Al 20. Investigation of the mechanical properties reveals that Zr 52 Co 25 Al 23 also has a higher fracture strength of up to 2308 MPa and a higher specific fracture strength of up to 3.78 × 105 N m kg−1 compared with 316L stainless steel, Ti-6Al-4V, as well as Mg-, Ti-, and other Zr-based BMGs. Graphical abstract Image 1 Highlights • Zr 52 Co 25 Al 23 (Zr52) and Zr 55 Co 25 Al 20 (Zr55) amorphous alloys were investigated. • Lower Zr/Al ratio leads to a wider SLR, higher thermal stability and higher GFA. • Zr52 has a higher resistance to crystallization than Zr55. • Zr52 has larger plasticity and higher specific strength than Zr55. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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