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article

Alkali Halide‐Doped Ga₂S₃–GeS₂ Glasses

Maria Bokova, Alla Paraskiva, Mohammad Kassem, Eugene Bychkov

physica status solidi (b) > 257 > 11 > n/a - n/a

Glass‐forming region, macroscopic properties, and electrical conductivity changes are systematically studied in the MY–Ga₂S₃–GeS₂ systems, where M = Na, K, Rb and Y = Cl, Br, I, as a function of alkali concentration, MY chemical composition, and Ga₂S₃/GeS₂ ratio using two composition lines: series A – (MY)_x(Ga₂S₃)_0.2–0.2x(GeS₂)_0.8–0.8x and series B – (MY)_x(Ga₂S₃)_{0.2 + 0.2x}(GeS₂)_0.8−1.2x. Glasses...

article

The glass formation and crystallization studies on iron phosphate–silicate glasses

Justyna Kuczek, Justyna Sułowska, Radosław Lach, Magdalena Szumera

Journal of Thermal Analysis and Calorimetry > 2019 > 138 > 3 > 1953-1964

The assessment of impact of incorporation of various amount of Fe₂O₃ at the expense of MgO and CaO on the glassy phase formation and thermal stability exhibited in P₂O₅–SiO₂–K₂O–MgO–CaO–Fe₂O₃ system was carried out. The characteristic temperatures for iron phosphate–silicate glasses and glass-crystalline materials were designated from associated DSC curves. Selected samples were subjected to the process...

article

On the bulk glass formation in the ternary Pd-Ni-S system

Alexander Kuball, Benedikt Bochtler, Oliver Gross, Victor Pacheco, more

Acta Materialia > 2018 > 158 > C > 13-22

We report on the formation of bulk metallic glasses in the ternary Pd-Ni-S system. In a large compositional range, glass formation is observed by copper mold casting with a glass forming ability of up to 2 mm in diameter for the composition Pd₃₇Ni₃₇S₂₆. The best compromise of thermal stability upon heating from the as-cast state and glass forming ability was found for Pd₃₁Ni₄₂S₂₇, having a critical...

article

Static atomic-scale structural heterogeneity and its effects on glass formation and dynamics of metallic glasses

X.J. Liu, S.D. Wang, H.Y. Fan, Y.F. Ye, more

Intermetallics > 2018 > 101 > C > 133-143

Molecular dynamics simulations were employed to investigate structural heterogeneity at the sub-nanometer scale for binary Cu-Zr liquids and glasses. The normalized local atomic number density fluctuates significantly in all the liquids and glasses, confirming existence of the static atomic-scale structural heterogeneity. The dynamic evolution of structural heterogeneity profile shows that the good...

article

Correlation between structure and glass-forming ability in Al86Ni14-xLax(x = 3,5,9) alloys: An ab initio molecular dynamics study

F.R. Wang, H.P. Zhang, M.Z. Li

Journal of Alloys and Compounds > 2018 > 763 > C > 392-398

The correlation of atomic and electronic structures with glass-forming ability (GFA) in Al₈₆Ni_14-xLa_x (x = 3,5,9 at.%) alloys were systematically investigated via ab initio molecular dynamics simulations for understanding the mechanism of GFA in Al-based alloys. The obtained glass transition temperatures indicate that GFA is better in Al₈₆Ni₉La₅ alloy, consistent with experimental measurements. In...

article

The role of open spaces to glass-forming ability in bulk metallic glasses

Y. Zhao, P.F. Liu, L. Wu, B. Zhang, more

Intermetallics > 2018 > 100 > C > 112-115

Element-specific positron annihilation spectroscopy for Fe-B-Y-Nb bulk metallic glasses (BMGs) successfully sheds light on the role of interstitial open spaces in the amorphous matrix, as e.g., geometrically ideal open space, referred to as a Bernal hole, and large-scale nanovoids to glass-forming ability (GFA), yielding the following rules. Applying main constituent atoms in smaller sizes such as...

article

Influences of preparation techniques on glass-forming ability of Fe–P–B–Si–C amorphous alloys

Ji-jun Zhang, Ya-qiang Dong, Lu-yang Bie, Qiang Li, more

Journal of Iron and Steel Research International > 2018 > 25 > 6 > 674-679

It has been widely accepted that the ultrafast cooling rate is required for the glass formation of amorphous alloys. Here, the larger glass-forming ability (GFA) of Fe₇₆P₅(B_0.5Si_0.3C_0.2)₁₉ amorphous alloy was achieved by water quenching at lower cooling rate under argon atmosphere. Cylindrical rods with diameters of 1–2 mm were prepared by water quenching without flux treatment, Cu-mold injection...

article

Glass-forming ability and thermal stability of Se_100−x(Ge₂Sb₂Te₅)_x glassy alloys

Ajit Kumar, Indra Sen Ram, Sunil Kumar, Jagjiwan Ram, more

Journal of Thermal Analysis and Calorimetry > 2018 > 134 > 2 > 923-931

Glassy Se_100−x(Ge₂Sb₂Te₅)_x (x = 5, 10, 15 and 20) bulk alloys were prepared by melt-quenched technique and studied by using differential scanning calorimetry at different heating rates under non-isothermal condition. The detailed thermal analysis shows that the glass transition temperature (T_g) depends on heating rates and x content. In particular, it is found that the glass-forming ability, thermal...

article

Formation and properties of Fe25Co25Ni25(P, C, B, Si)25 high-entropy bulk metallic glasses

Yongqiang Xu, Yanhui Li, Zhengwang Zhu, Wei Zhang

Journal of Non-Crystalline Solids > 2018 > 487 > C > 60-64

New ferromagnetic high-entropy bulk metallic glasses (HE-BMGs) with superior glass-forming ability (GFA) and high strength were developed in the pseudo quaternary FeCoNi(P, C, B, Si) system. The HE-BMG rods were fabricated by copper mold casting method in the composition range of Fe₂₅Co₂₅Ni₂₅(P_0.3–0.5C_0.1–0.3B_0.2–0.3Si_0.1–0.3)₂₅, in which the Fe₂₅Co₂₅Ni₂₅(P_0.4C_0.2B_0.2Si_0.2)₂₅ and Fe₂₅Co₂₅Ni₂₅(P_0.5...

article

Analysis of the Glass-Forming Ability of Fe–Er Alloys, Based on Thermodynamic Modeling

N. A. Arutyunyan, A. I. Zaitsev, S. F. Dunaev, K. B. Kalmykov, more

Russian Journal of Physical Chemistry A > 2018 > 92 > 5 > 829-835

The Fe–Er phase diagram and thermodynamic properties of all its phases are assessed by means of self-consistent analysis. To refine the data on phase equilibria in the Fe–Er system, an investigation is performed in the 10–40 at % range of Er concentrations. The temperature–concentration dependences of the thermodynamic properties of a melt are presented using the model of ideal associated solutions...

article

Glass-forming ability and corrosion performance of Mn-doped Mg–Zn–Ca amorphous alloys for biomedical applications

Jian-Li Wang, Yin Wan, Zhi-Jun Ma, Yong-Chun Guo, more

Rare Metals > 2018 > 37 > 7 > 579-586

In the present work, ribbon and 2-mm rod samples of Mg–Zn–Ca–Mn alloys were prepared by melt-spinning and copper mold injection methods, respectively. Effects of Mn doping on glass-forming ability and corrosion performance in simulated body fluid of Mg₆₅Zn₃₀Ca₅ alloy were studied through X-ray diffraction, scanning electron microscopy, differential scanning calorimeter, and electrochemical and immersion...

article

The Effect of Hf Substituting for Cu on the Glass-Forming Ability, Crystallization Behavior, and Saturation Magnetization in Fe₈₅Si₂B₈P₄Cu_1−xHf_x Alloys

L. Zhou, G. T. Wang, L. B. Zheng, Y. Z. Yang

Journal of Superconductivity and Novel Magnetism > 2018 > 31 > 12 > 3959-3964

The effect of Hf substituting for Cu on the glass-forming ability (GFA), crystallization behavior, and saturation magnetization (M_s) in Fe-rich Fe₈₅Si₂B₈P₄Cu_1−xHf_x alloys has been investigated. The result shows that the addition of Hf plays a positive role in improving GFA, and the Fe₈₅Si₂B₈P₄Cu_0.5Hf_0.5 alloy ribbon shows an entirely amorphous structure. Both the ribbons of Fe₈₅Si₂B₈P₄Cu₁ and Fe₈₅...

article

A new correlation between the characteristics temperature and glass-forming ability for bulk metallic glasses

Zhilin Long, Wei Liu, Ming Zhong, Yun Zhang, more

Journal of Thermal Analysis and Calorimetry > 2018 > 132 > 3 > 1645-1660

A new criterion or parameter χ given by $$\left( {\frac{{T_{\text{x}} - T_{\text{g}} }}{{T_{\text{l}} - T_{\text{x}} }}} \right) \times \left( {\frac{{T_{\text{x}} }}{{T_{\text{l}} - T_{\text{x}} }}} \right)^{a}$$ Tx-TgTl-Tx×TxTl-Txa (wherein T_g is the glass transition temperature, T_x the onset crystallization temperature, T_l the liquidus temperature or the offset temperature of melting and a a fitting...

article

Effect of Fe substitution on magnetocaloric effects and glass-forming ability in Gd-based metallic glasses

Lin Xue, Jun Li, Weiming Yang, Chenchen Yuan, more

Intermetallics > 2018 > 93 > C > 67-71

In this work, we report on the systematic variation of the glass-forming ability (GFA) and magnetocaloric effect (MCE) in Gd₅₅Co_20-xAl₂₄Si₁Fe_x (x = 0, 1, 2, 3, 4 and 5 at%) metallic glasses (MGs), which are potential candidates for magnetocaloric cooling applications. The addition of Fe broadens the full width of half maximum of magnetic entropy change (δT_FWHM), thereby greatly increases the refrigeration...

article

General structural and dynamic characteristics beneficial to glass-forming ability of Fe-based glass-forming liquids

Nannan Ren, Baoshuang Shang, Pengfei Guan, Lina Hu

Journal of Non-Crystalline Solids > 2018 > 481 > C > 116-122

It is known that the relatively poor glass-forming ability (GFA) is a big problem for the development of Fe-based metallic glasses (MGs) and thus understanding the GFA-related structural and dynamic characteristics is significant. Using classical molecular dynamics (MD) simulations, the present work aims to discover the general GFA-related features in Fe-based liquids by the addition of large metallic...

article

Significantly enhanced mechanical properties of ZrAlCo bulk amorphous alloy by microalloying with Ta

T.H. Li, Y.C. Liao, S.M. Song, Y.L. Jiang, more

Intermetallics > 2018 > 93 > C > 162-168

The alloy composition of Zr₅₄Al₁₇Co₂₉ with high glass forming ability (GFA) in the Zr-Al-Co system was predicted by using the multiple binary eutectic clusters from the phase diagram. Then the microalloying effects of Ta on the microstructure, thermal properties, mechanical properties, and corrosion resistance of (Zr₅₄Al₁₇Co₂₉)_100-xTa_x (x = 0, 1, 1.5, 2, 2.5, 3) bulk amorphous alloy (BAA) were systematically...

article

Formation, thermal stability and mechanical properties of high entropy (Fe,Co,Ni,Cr,Mo)-B amorphous alloys

F. Wang, A. Inoue, F.L. Kong, Y. Han, more

Journal of Alloys and Compounds > 2018 > 732 > C > 637-645

The formation, thermal stability and mechanical properties of high entropy (HE) (Fe_0.25Co_0.25Ni_0.25Cr_0.125Mo_0.125)_100-xB_x (x = 11–31 at%) amorphous alloys were examined with the aim of clarifying the partial replacement effect of Cr by Mo in comparison with previously reported HE (Fe_0.25Co_0.25Ni_0.25Cr_0.25)_100-xB_x amorphous alloys. The amorphous phase was formed in a very wide B range of 11–31 at%,...

article

The maximum of glass-forming ability in Se-GeSe2 system - Phillips-Thorpe threshold and/or eutectic?

P. Kutálek, E. Černošková, L. Beneš, P. Knotek, more

Journal of Non-Crystalline Solids > 2017 > 478 > C > 75-78

Glass-forming ability of Ge_0.08Se_0.92 (eutectic composition) and Ge_0.20Se_0.80 (Phillips-Thorpe threshold where the mean coordination number equals to 2.4) are compared employing very slow melts cooling. Using X-ray diffraction the presence of crystalline phase (Ge₄Se₉) was found in slowly cooled melt of Ge_0.20Se_0.80. It is suggested that in Se-GeSe₂ system the maximum of glass-forming ability is shifted...

article

On the high glass-forming ability of Pt-Cu-Ni/Co-P-based liquids

Oliver Gross, Sascha S. Riegler, Moritz Stolpe, Benedikt Bochtler, more

Acta Materialia > 2017 > 141 > C > 109-119

The continuous and isothermal crystallization diagrams of the Pt_42.5Cu₂₇Ni_9.5P₂₁ and the Pt₆₀Cu₁₆Co₂P₂₂ bulk glass forming compositions are determined using calorimetric experiments. In the case of the Pt_42.5Cu₂₇Ni_9.5P₂₁ bulk metallic glass, the formation of the primary crystalline phase can be prevented by rapid cooling in a conventional DSC. In contrast, for similar cooling conditions, the formation...

article

Effects of Cu addition on the glass forming ability and corrosion resistance of Ti-Zr-Be-Ni alloys

Jia-Lun Gu, Yang Shao, Shao-Fan Zhao, Si-Yuan Lu, more

Journal of Alloys and Compounds > 2017 > 725 > C > 573-579

The Ti-based bulk metallic glasses (BMG) with high Ti content (>50 at.%) have attracted wide attention for their outstanding mechanical properties, despite their glass forming ability (GFA) is still relatively poor. Here the (Ti₅₅Zr₁₅Be₂₀Ni₁₀)_100-xCu_x(x = 2, 4, 6, 8 and 10 at.%) BMGs were designed and prepared by copper mold casting. The critical diameter of the original alloy could be enhanced...

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Alkali Halide‐Doped Ga₂S₃–GeS₂ Glasses

The glass formation and crystallization studies on iron phosphate–silicate glasses

On the bulk glass formation in the ternary Pd-Ni-S system

Static atomic-scale structural heterogeneity and its effects on glass formation and dynamics of metallic glasses

Correlation between structure and glass-forming ability in Al86Ni14-xLax(x = 3,5,9) alloys: An ab initio molecular dynamics study

The role of open spaces to glass-forming ability in bulk metallic glasses

Influences of preparation techniques on glass-forming ability of Fe–P–B–Si–C amorphous alloys

Glass-forming ability and thermal stability of Se_100−x(Ge₂Sb₂Te₅)_x glassy alloys

Formation and properties of Fe25Co25Ni25(P, C, B, Si)25 high-entropy bulk metallic glasses

Analysis of the Glass-Forming Ability of Fe–Er Alloys, Based on Thermodynamic Modeling

Glass-forming ability and corrosion performance of Mn-doped Mg–Zn–Ca amorphous alloys for biomedical applications

The Effect of Hf Substituting for Cu on the Glass-Forming Ability, Crystallization Behavior, and Saturation Magnetization in Fe₈₅Si₂B₈P₄Cu_1−xHf_x Alloys

A new correlation between the characteristics temperature and glass-forming ability for bulk metallic glasses

Effect of Fe substitution on magnetocaloric effects and glass-forming ability in Gd-based metallic glasses

General structural and dynamic characteristics beneficial to glass-forming ability of Fe-based glass-forming liquids

Significantly enhanced mechanical properties of ZrAlCo bulk amorphous alloy by microalloying with Ta

Formation, thermal stability and mechanical properties of high entropy (Fe,Co,Ni,Cr,Mo)-B amorphous alloys

The maximum of glass-forming ability in Se-GeSe2 system - Phillips-Thorpe threshold and/or eutectic?

On the high glass-forming ability of Pt-Cu-Ni/Co-P-based liquids

Effects of Cu addition on the glass forming ability and corrosion resistance of Ti-Zr-Be-Ni alloys

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