Modified Angell Plot of Viscous Flow with Application to Silicate and Metallic Glass-Forming Liquids

2014 ◽  
Vol 5 (2) ◽  
pp. 193-205 ◽  
Author(s):  
Ana F. Kozmidis-Petrović
Keyword(s):  
Metallic Glass ◽  
Viscous Flow ◽  
Glass Forming

scholarly journals Viscous Flow of Supercooled Liquid in a Zr-Based Bulk Metallic Glass Synthesized by Additive Manufacturing

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3803
Author(s):  
Konrad Kosiba ◽  
Liang Deng ◽  
Sergio Scudino
Keyword(s):  
Additive Manufacturing ◽  
Metallic Glass ◽  
Viscous Flow ◽  
Supercooled Liquid ◽  
Viscous Liquids ◽  
Powder Bed ◽  
Glass Forming ◽  
Size Limitation ◽  
Structural Applications ◽  
Thermoplastic Forming

The constraint in sample size imposed by the critical cooling rate necessary for glass formation using conventional casting techniques is possibly the most critical limitation for the extensive use of bulk metallic glasses (BMGs) in structural applications. This drawback has been recently overcome by processing glass-forming systems via additive manufacturing, finally enabling the synthesis of BMGs with no size limitation. Although processing by additive manufacturing allows fabricating BMG objects with virtually no shape limitation, thermoplastic forming of additively manufactured BMGs may be necessary for materials optimization. Thermoplastic forming of BMGs is carried out above the glass transition temperature, where these materials behave as highly viscous liquids; the analysis of the viscosity is thus of primary importance. In this work, the temperature dependence of viscosity of the Zr52.5Cu17.9Ni14.6Al10Ti5 metallic glass fabricated by casting and laser powder bed fusion (LPBF) is investigated. We observed minor differences in the viscous flow of the specimens fabricated by the different techniques that can be ascribed to the higher porosity of the LPBF metallic glass. Nevertheless, the present results reveal a similar overall variation of viscosity in the cast and LPBF materials, which offers the opportunity to shape additively manufactured BMGs using already developed thermoplastic forming techniques.

Viscosity of Metallic Glass Forming Liquids: Analysis Based on Bond Strength-Coordination Number Fluctuations

2010 ◽  
Vol 638-642 ◽  
pp. 1621-1626 ◽  
Author(s):  
Masaru Aniya ◽  
Masahiro Ikeda
Keyword(s):  
Metallic Glass ◽  
Bond Strength ◽  
Viscous Flow ◽  
Coordination Number ◽  
Structural Units ◽  
Mean Values ◽  
Glass Forming ◽  
The Mean

A model that describes the viscous behavior in terms of the mean values of the bond strength, the coordination number, and their fluctuations of the structural units that form the melt has been proposed by one of the authors. In the present study, the viscous behavior of several metallic glass forming systems are analyzed by using the model. From the analysis, microscopic information such as the number of bonds that must be broken to observe the viscous flow is obtained. It is also shown that when the magnitudes of energy and coordination number fluctuations are equal, the behavior of the viscosity described by our model corresponds perfectly to the behavior described by the Vogel-Fulcher-Tammann (VFT) equation.

Viscous flow of the Pd43Ni10Cu27P20 bulk metallic glass-forming liquid

2004 ◽  
Vol 84 (4) ◽  
pp. 487-489 ◽  
Author(s):  
G. J. Fan ◽  
H.-J. Fecht ◽  
E. J. Lavernia
Keyword(s):  
Metallic Glass ◽  
Viscous Flow ◽  
Bulk Metallic Glass ◽  
Glass Forming

Structural topological signature of high-temperature non-Arrhenius crossover in metallic glass-forming liquids

2021 ◽  
Vol 200 ◽  
pp. 113926
Author(s):  
Nannan Ren ◽  
Lina Hu ◽  
Bing Wang ◽  
Kaikai Song ◽  
Pengfei Guan
Keyword(s):  
High Temperature ◽  
Metallic Glass ◽  
Glass Forming

Controlled Elasticity in Nano-Structured Metallic Glass by Ion Implantation Method

2007 ◽  
Vol 561-565 ◽  
pp. 1315-1318
Author(s):  
Shinji Muraishi ◽  
Hirono Naito ◽  
Jhi Shi ◽  
Yoshio Nakamura ◽  
Tatsuhiko Aizawa
Keyword(s):  
Metallic Glass ◽  
Glassy Phase ◽  
Glassy Matrix ◽  
Nano Structure ◽  
Glass Forming ◽  
Nitride Formation ◽  
Indentation Tests ◽  
The Mean ◽  
Implantation Method ◽  
Critical N Concentration

Different reactivity of ions has been implanted into Zr-Cu metallic glass to obtain nano-structured surface with controlled elasticity. The penetration of glass forming element of Ni+ into crystalline Zr-Cu stabilizes glassy phase to induce crystalline-amorphous (c-a) transition during implantation process. In the meanwhile, penetration of N+ into glassy matrix induces precipitation of (Zr, Cu)N at the mean penetration depth of N. Critical N concentration for nitride formation is estimated to be (Zr,Cu)-20at%N, which also suggests existing of N solid solution of glassy phase. Inert element of Ar+ yields dispersion of nano-voids among glassy matrix. Nano-indentation tests reveal that Young’s modulus of ion implanted glassy film dramatically changes with respect to the induced nano-structure, to decrease 0.4 times for Ar+, to increase 1.3 times for N+ as comparison with that for as-deposited state.

Data-driven discovery of a universal indicator for metallic glass forming ability

2021 ◽  
Author(s):  
Ming-Xing Li ◽  
Yi-Tao Sun ◽  
Chao Wang ◽  
Li-Wei Hu ◽  
Sungwoo Sohn ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Glass Forming Ability ◽  
Data Driven ◽  
Glass Forming ◽  
Universal Indicator
Sign in / Sign up

Export Citation Format

Share Document