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Jin, Z.S.; Yang, Y.J.; Zhang, Z.P.; Ma, X.Z.; Lv, J.W.; Wang, F.L.; Ma, M.Z.; Zhang, X.Y.; Liu, R.P.
Journal of alloys and compounds, 10/2019, Letnik: 806Journal Article
A series of Ni-free Zr55Ti3HfxCu32-xAl10 (x = 0, 1, 2, 3, 4, 5 at. %) bulk metallic glasses (BMGs) were developed by copper mold suction-casting. The effect of partially substituting Cu by Hf was investigated in terms of glass-forming ability (GFA), mechanical properties, and corrosion behavior. As a result of the partial substitution, the GFA of Hf-bearing amorphous alloys were significantly enhanced as compared to Zr55Ti3Cu32Al10 BMGs. Hf addition also enlarged the supercooled liquid region from 55 K to 70 K. The critical diameter was found to increase from 4 mm to 8 mm for x = 3. The corresponding compressive yield strength was over 1800 ± 21 MPa with a large plastic strain above 2.60 ± 0.10%. Electrochemical tests indicated that the lowest corrosion current density was 1.6 ± 0.1 × 10−8 A/cm2 for the alloy with x = 5 in H2SO4 solution, thereby yielding a superior corrosion resistance. •Partial substitution of Hf with Cu greatly enhanced the GFA of BMGs.•The Hf-bearing BMGs show a higher σy of 1800 ± 21 MPa and a large εp of 2.60 ± 0.10%.•The lowest icorr of BMGs is 1.6 ± 0.1 × 10−8 A/cm2 in H2SO4 solution.
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