Copper oxide content dependence of crystallization behavior, glass forming ability, glass stability and fragility of lithium borate glasses

2010 ◽  
Vol 405 (1) ◽  
pp. 247-253 ◽  
Author(s):  
A.A. Soliman ◽  
I. Kashif
Keyword(s):  
Copper Oxide ◽  
Crystallization Behavior ◽  
Glass Forming Ability ◽  
Borate Glasses ◽  
Oxide Content ◽  
Lithium Borate ◽  
Glass Stability ◽  
Glass Forming

Development of quaternary Fe–B–Y–Nb bulk glassy alloys with high glass-forming ability

2007 ◽  
Vol 22 (2) ◽  
pp. 471-477 ◽  
Author(s):  
Dong Ho Kim ◽  
Jin Man Park ◽  
Do Hyang Kim ◽  
Won Tae Kim
Keyword(s):  
Glass Phase ◽  
Crystallization Behavior ◽  
Alloy System ◽  
Glass Forming Ability ◽  
Maximum Diameter ◽  
Glass Forming ◽  
Glassy Alloys ◽  
The Stability ◽  
Nb Addition ◽  
Compressive Mechanical Property

The effects of niobium (Nb) addition on the glass-forming ability (GFA), crystallization behavior, and compressive mechanical property of iron (Fe)–boron (B)–yttrium (Y) alloys have been investigated. Among the (Fe71.2B24Y4.8)100−xNbx (x = 0, 2, 4, 6, 8) alloys investigated, (Fe71.2B24Y4.8)96Nb4 exhibits the highest GFA, enabling the formation of glassy rods with a maximum diameter of 7 mm, which is the largest among quaternary Fe-based alloys. The comparison of the crystallization behavior of the alloys shows that the formation of metastable Fe23B6 phase during crystallization in the (Fe71.2B24Y4.8)96Nb4 alloy can suppress the formation of other stable crystalline phases such as α-Fe, enhancing the stability of the glass phase. The present results show that the attainment of a significantly high GFA is possible even in a quaternary Fe-based alloy system by properly tailoring the competing crystalline phase by the modification of liquid chemistry.

Structural Origin of Additional Infrared Transparency and Enhanced Glass-Forming Ability in Rare-Earth-Rich Borate Glasses without B–O Networks

2020 ◽  
Vol 59 (19) ◽  
pp. 13942-13951
Author(s):  
Shunta Sasaki ◽  
Atsunobu Masuno ◽  
Koji Ohara ◽  
Yutaka Yanaba ◽  
Hiroyuki Inoue ◽  
...  
Keyword(s):  
Rare Earth ◽  
Glass Forming Ability ◽  
Borate Glasses ◽  
Glass Forming

scholarly journals Crystallization Behavior of Al70Fe12.5V12.5Nb5 Amorphous Alloy Formed by Mechanical Alloying

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 383 ◽  
Author(s):  
Xuan Liu ◽  
Xingfu Wang ◽  
Yongli Si ◽  
Xiaokang Zhong ◽  
Fusheng Han
Keyword(s):  
Amorphous Alloy ◽  
Mechanical Alloying ◽  
Amorphous Alloys ◽  
Crystallization Behavior ◽  
Supercooled Liquid ◽  
Supercooled Liquid Region ◽  
Glass Forming Ability ◽  
Liquid Region ◽  
Application Field ◽  
Glass Forming

In this study, the formation and crystallization of the Al70Fe12.5V12.5Nb5 amorphous alloys has been investigated. The addition of Nb enhances the supercooled liquid region and glass forming ability of the Al-Fe-V amorphous alloys. The Al70Fe12.5V12.5Nb5 amorphous alloy exhibits two distinct crystallization steps and a large supercooled liquid region at more than 100 K. Kissinger and Ozawa analyses showed that the two activation energies for crystallization (Ex) were estimated to be 366.3 ± 23.9 and 380.5 ± 23.9 kJ/mol. Large supercooled liquid regions are expected to gain an application field of Al-based amorphous alloys.

scholarly journals Preparation, Characterization, and Properties of Novel Ti-Zr-Be-Co Bulk Metallic Glasses

Materials ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 223 ◽  
Author(s):  
Pan Gong ◽  
Fangwei Li ◽  
Junsong Jin
Keyword(s):  
Corrosion Resistance ◽  
Metallic Glasses ◽  
Crystallization Behavior ◽  
Base Alloy ◽  
Bulk Metallic Glasses ◽  
Critical Diameter ◽  
Glass Forming Ability ◽  
Specific Strength ◽  
Glass Forming ◽  
Co Addition

We developed novel Ti-Zr-Be-Co bulk metallic glasses through Co addition based on a ternary Ti45Zr20Be35 alloy. By altering the alloying routes and alloying contents, the influence of Co alloying on glass-forming ability, thermal stability, thermoplastic formability, crystallization behavior, and corrosion resistance has been investigated systematically. It was found that the best alloying route for enhancing the glass-forming ability, thermoplastic formability, compressive plasticity, and corrosion resistance is to replace Be by Co. Ti45Zr20Be23Co12 possesses the largest critical diameter of 15 mm for glass formation. Ti45Zr20Be27Co8 possesses the highest thermoplastic formability which is comparable to that of Vitreloy alloys. Ti45Zr20Be25Co10 exhibits the largest room temperature plasticity of 15.7% together with a high specific strength of 3.90 × 105 Nm/kg. The addition of Co also strongly affects the crystallization behavior of the base alloy, resulting in a more complex crystallization process. The corrosion resistance of Ti-Zr-Be alloy in 1 mol/L HCl solution can also be enhanced by Co alloying. The related mechanisms have been explained in detail, which provide guidance for the composition design of Ti-based metallic glasses with improved properties.

Si-alloying effect on glass-forming ability and crystallization behavior of Zr72.5Al10Fe17.5 metallic glass

2022 ◽  
Vol 580 ◽  
pp. 121391
Author(s):  
Liqiao Yue ◽  
Qijing Sun ◽  
Yihao Wang ◽  
Yin Wang ◽  
Rongjie Xue ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Crystallization Behavior ◽  
Glass Forming Ability ◽  
Alloying Effect ◽  
Glass Forming

Effect of K2O/ZnO+CaO Ratio on Density, Glass Forming Ability, Crystallization of SiO2- Al2O3- ZnO- K2O- CaO Frites

2021 ◽  
Author(s):  
aida faghinia ◽  
R. Salami ◽  
Z. Khakpour ◽  
M. Zakeri
Keyword(s):  
Glass Transition ◽  
Mole Fraction ◽  
Raw Materials ◽  
Glass Forming Ability ◽  
Powder Size ◽  
Molar Volumes ◽  
Glass Stability ◽  
Glass Forming ◽  
Zno Powder ◽  
Hardness Values

Abstract The frites by mole fraction of 2.5 SiO2, 0.20 Al2O3, 0.15 B2O3, 0.15ZnO, 0.17K2O, 0.67CaO systems in three ratios of S including 0.37(denoted by F1frites ),0.31(F2), 0.24(F3) (S=K2O/CaO+ZnO) were studied. ZnO powder with 500 nm (N series) and >1μm sizes (F series) opted from the recycled Zn ingots dusts and commercially ZnO respectively, were used as the raw materials. By decreasing the S ratio, the Molar Volumes of frites were decreased, The glass transition ΔTg(=-154ºC), and the crystallization temperatures ΔTp (=+17ºC) values were decreased and increased respectively. It was shown that the GS (glass stability) values are independent of the Zinc Oxide's powder size, while the Molar Volumes of N series were lower than the F ones. The Zinc Silicate (Willemite) beside Anorthite and Parawollastonite phases were crystallized in the resulted glazes. The hardness values were in 700-850 Hv range, the transparency and whiteness were higher than 80 and 60 respectively.

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