Results 261 to 270 of about 669,450 (300)

Reduced glass transition temperature and glass forming ability of bulk glass forming alloys

Journal of Non-Crystalline Solids, 2000
Abstract Onset temperature (solidus) T m and offset temperature (liquidus) T l of melting of a series of bulk glass forming alloys based on Zr, La, Mg, Pd and rare-earth elements have been measured by studying systematically the melting behaviour of these alloys using DTA or DSC. Bulk metallic glass formation has been found to be most effective
Lu, Z.P., Li, Y., Ng, S.C.
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Correlation between volumetric change and glass-forming ability of metallic glass-forming alloys

Applied Physics Letters, 2008
We draw attention to the relationship between volumetric change and glass-forming ability (GFA) in various metallic glass-forming alloys. The critical cooling rate can be expressed as Rc=2.5×10−5exp(5.0×102Vlg), where Vlg is defined as (Vl-Vg)∕Vl.
E. S. Park, D. H. Kim
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METALLIC GLASS FORMING ABILITY

1985
The present knowledge of thermodynamic and kinetic factors influencing the metallic glass forming ability GFA are discussed essentially from a thermodynamic point of view. The different attempts to calculate the free energy difference between the undercooled liquid and the crystalline phase at the glass temperature T g are presented.
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Exceptionally high glass-forming ability of an FeCoCrMoCBY alloy

Applied Physics Letters, 2005
It has been well documented that the maximum thickness of as-cast glassy samples attainable through conventional metallurgical routes is the decisive criteria for measuring the glass-forming ability (GFA) of bulk metallic glasses (BMGs). Here we report the exceptionally high GFA of an FeCoCrMoCBY alloy which can be fabricated in the form of glassy rods
J. Shen, Q. J. Chen, J. F. Sun, H. B. Fan, G. Wang   +4 more
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Influence of preparation pathway on the glass forming ability

International Journal of Pharmaceutics, 2017
The glass forming ability (GFA), i.e. the ease of amorphization of drugs, is mostly investigated using the critical cooling rate upon melt quenching to generate an amorphous product via the thermodynamic pathway. However, amorphous materials can also be prepared via the kinetic pathway by milling.
Blaabjerg, Lasse Ingerslev, Lindenberg, Eleanor, Rades, Thomas, Grohganz, Holger, Löbmann, Korbinian   +4 more
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Analysis of thermodynamic behaviour of bulk metallic glass forming melts and glass forming ability

Journal of Thermal Analysis and Calorimetry, 2009
The thermodynamic behaviour of bulk metallic glass (BMG) forming melts have been studied by analyzing the temperature dependence of the Gibbs free energy difference (∆G), entropy difference (∆S) and enthalpy difference (∆H)between the undercooled melt and the corresponding equilibrium solid phases.
P. K. Singh, K. S. Dubey
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Glass forming ability in mechanically alloyed Fe-Zr

Applied Physics Letters, 1986
Amorphous Fe-Zr powders have been prepared by mechanical alloying in a powder mill. The samples are characterized by x-ray diffraction, differential scanning calorimetry, and saturation magnetization measurements. The glass forming range reaches from 30 to 78 at. % Fe being much wider than for melt-spun samples.
E. Hellstern, L. Schultz
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Prediction of Glass Forming Ability Using Thermodynamic Parameters

Transactions of the Indian Institute of Metals, 2012
Formation of a glassy phase in metallic systems is controlled to large extent by the composition of the alloy. Alloying behavior can be qualitatively predicted from the knowledge of enthalpy of mixing and atomic size mismatch among elements involved in bonding.
B. Ramakrishna Rao, A. S. Gandhi, S. Vincent, J. Bhatt, B. S. Murty   +4 more
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The effect of Y on glass forming ability

Scripta Materialia, 2005
Abstract We have discovered a new glass forming region (GFR) defined by melt-spinning at a speed of 30 m/s in a ternary Fe–Fe2B–Fe4B4Y eutectic in the Fe–B–Y alloy system. This GFR is remarkably wide, within the compositional range 19–40 at.% B, 3 to ∼10 at.% Y and 76–50 at.% Fe, with the best glass former being Fe71.2B24Y4.8 for a 1 mm fully ...
Zhang, J., Tan, H., Feng, Y.P., Li, Y.
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Glass‐Forming Ability in Calcium Aluminate‐Based Systems

Journal of the American Ceramic Society, 1993
Glass formation and stability of calcium aluminate‐based glasses were assessed, qualitatively, by changing melt volumes and cooling rates. Stable glasses, obtained through the addition of sodium, barium, and strontium to the binary system, were investigated in detail. Glass stability was evaluated via DTA analysis.
Eugenie V. Uhlmann, Michael C. Weinberg, Norbert J. Kreidl, Aydin A. Goktas   +3 more
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