Correlation between local structure of melts and glass forming ability for Fe78M9B13 (M=Nb, Si, and Zr) alloys

With in glass forming region of Li2O–WO3–B2O3 glass system, a particular composition 40Li2O–5WO3–(55 –x) B2O3 : x V2O5 (with x ranging from 0.2 to 0.8, all are in mol.%) is chosen. The DSC traces are obtained to identify the glass transition temperature ( Tg ) and the glass forming ability of all the glass samples. The ESR and IR spectra portray the local structure of the glass system and valance states of the vanadium ions in the glass matrix. As the content of V2O5 increases up to 0.6 mol.% in the glass system, a gradual conversion of vanadium ions from V5+ state to V4+ state is observed, causing the depolymerization in the glass matrix by the transformation of several glass forming units BO4 → BO3 and WO4 → WO6 .

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Polytetrahedral structure and glass-forming ability of simulated Ni–Zr alloys

The Journal of Chemical Physics ◽

10.1063/1.5041325 ◽

2018 ◽

Vol 149 (13) ◽

pp. 134501 ◽

Cited By ~ 7

Author(s):

B. A. Klumov ◽

R. E. Ryltsev ◽

N. M. Chtchelkatchev

Keyword(s):

Glass Forming Ability ◽

Glass Forming ◽

Zr Alloys

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Publisher’s Note: “Polytetrahedral structure and glass-forming ability of simulated Ni–Zr alloys” [J. Chem. Phys. 149, 134501 (2018)]

The Journal of Chemical Physics ◽

10.1063/1.5082532 ◽

2018 ◽

Vol 149 (22) ◽

pp. 229901

Author(s):

B. A. Klumov ◽

R. E. Ryltsev ◽

N. M. Chtchelkatchev

Keyword(s):

Chem Phys ◽

Glass Forming Ability ◽

Glass Forming ◽

Zr Alloys

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Effect of Zr addition on the glass-forming ability and mechanical properties of Ni–Nb alloy

Journal of Materials Research ◽

10.1557/jmr.2007.0055 ◽

2007 ◽

Vol 22 (2) ◽

pp. 453-459 ◽

Cited By ~ 12

Author(s):

Z.W. Zhu ◽

H.F. Zhang ◽

W.S. Sun ◽

Z.Q. Hu

Keyword(s):

Mechanical Properties ◽

Glass Forming Ability ◽

Compression Tests ◽

Casting Method ◽

Scanning Calorimetry ◽

Glass Forming ◽

Zr Addition ◽

Pattern Structures ◽

Injection Casting ◽

Zr Alloys

The effect of zirconium (Zr) addition on the glass-forming ability (GFA) and mechanical properties of the Ni61.5Nb38.5 alloy has been studied. The addition of Zr improves the GFA. When x = 5 for Ni61.5Nb38.5−xZrx (in at.%) alloys, the alloy exhibits the best GFA and can be cast into 3-mm-diameter amorphous samples by using the copper mold injection-casting method. Differential scanning calorimetry measurements indicated that the thermal parameters, such as Trg and γ, have not a good correlation with the GFA in the Ni–Nb–Zr alloys. Compression tests reveal that the addition of Zr just decreases the fracture strength slightly from 3.4 to 3 GPa and that all of the tested samples exhibit a little compressive plasticity of about 2%. When x = 9, the feature of the fracture surface indicates that the alloy has a tendency for transition from the ductile to the brittle. And delicate “dimple” and microscale vein pattern structures have been observed on it.

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