Optimization of bulk metallic glass forming compositions in Zr–Cu–Al system by thermodynamic modeling

Bhatt, Jatin; Wu, Jian; Xia, Junhai; Wang, Qing; Chen, Dong; Murty, B.S.

doi:10.1016/j.intermet.2006.10.018

Cited by 75 publications

(51 citation statements)

References 29 publications

(16 reference statements)

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“…However, for the multicomponent systems, it is difficult to determine the phase diagram with all possible deep eutectics to identity the compositions that can form BMG. It is also observed from the previous study of the present authors [8] for the ternary system that the value of the product DH chem · DS r /k B (represented by the parameter P HS ) is maximum at the deep eutectic. The parameter P HS is the product of enthalpy due to chemical mixing and mismatch entropy normalized by the Boltzmann constant.…”

Section: Resultssupporting

confidence: 86%

“…[8] Further analysis on Zr-Cu-Al, Zr-Ni-Al, Zr-Cu-Ti, and Zr-Co-Al systems (Table I) showed for the best BMG formation with critical thickness (Z c (mm)) of 3 mm and above that the DS config /R ranges from 0.9 to 1.0. It is well known that metallic glasses are configurationally frozen supercooled liquids, and they are more prone to form at compositions near to deep eutectic.…”

Section: Resultsmentioning

confidence: 99%

“…This is because DS r /k B depends on the atomic diameter and composition, as is evident from Eq. [4][5][6][7][8]. Atomic diameters of Ti, Cu, and Ni are 0.292, 0.256, and 0.250 nm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The present work is an attempt toward this problem. In an earlier work, the present authors have successfully optimized the bulk forming compositions in ternary Zr-Cu-Al, [8,9] and this article extends this approach to the quaternary Cu-Zr-Ti-Ni system.…”

Section: Introductionmentioning

confidence: 88%

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Thermodynamic and Topological Modeling and Synthesis of Cu-Zr-Ti-Ni–Based Bulk Metallic Glasses by Mechanical Alloying

Bhatt

Dey

Murty

2007

Metall Mater Trans A

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In the present investigation, thermodynamic and topological concepts have been used together to understand the formation of bulk metallic glasses. The article attempts to develop a parameter that combines chemical mixing enthalpy (DH chem ), mismatch entropy normalized by Boltzmann constant (DS r /k B ), and configurational entropy (DS config /R), which can be effectively used to identify the best bulk glass forming compositions in multicomponent systems. The DH chem for multicomponent systems has been calculated by extending the MiedemaÕs macroscopic model, and DS r /k B was obtained from MansooriÕs approach. The iso-DH chem , iso-DS r /k B , and iso-DS config /R contours have been developed. The product of DH chem and DS r /k B in the DS config /R range of 0.9 to 1.0 can be correlated strongly to glass forming ability. This has been demonstrated in the case of the quaternary Cu-Zr-Ti-Ni bulk glass forming system to determine the bulk metallic glass forming compositions. Mechanical alloying is used to prepare the bulk amorphous powder at the compositions predicted by the model in order to validate the model.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 88%

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Thermodynamic and Topological Modeling and Synthesis of Cu-Zr-Ti-Ni–Based Bulk Metallic Glasses by Mechanical Alloying

Bhatt

Dey

Murty

2007

Metall Mater Trans A

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“…Furthermore, as pointed out by Rao et al, 10) these quantitative parameters have not true predictive ability because they need the alloy considered to be first prepared in glassy form, to be able to measure the glass transition temperature and/or the crystallization temperature. Therefore, many parameters have been proposed such as Gibbs free energy difference ÁG a-ss between amorphous phase and solid solutions phase, 10) melting enthalpy ÁH m , 11) a product of thermodynamic parameter (ÁH chem Â S =k B ), 12) to predict GFA of alloy systems without the need of preparing them in glass form. Recently, some efforts have been made to search for GFA of alloy systems by the CALPHAD (Calculation of Phase Diagram) approach.…”

Section: Introductionmentioning

confidence: 99%

Bulk Metallic Glass-Forming Region of Four Multicomponent Alloy Systems

Zhang

Chen

2009

Mater. Trans.

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We have evaluated the predictive ability of a simple method combing the efficient cluster packing model of metallic glasses proposed by Miracle, chemical mixing enthalpy and the normalized configurational entropy S config =R in rapidly locating the bulk metallic glass (BMG)-forming composition region, in four multicomponent alloy systems. It is shown that the BMG-forming regions are similar in the topologically and chemically equivalent La-Al-Co and Ce-Al-Co alloy systems. However, in the topologically equivalent Zr-Ti-Cu-Ni and Zr-Ti-Al-Cu-Ni alloy systems, the BMG-forming regions are quite different due to the difference in chemical bonding between constituents. BMG formation is most probably a compromise between topological and chemical effects. This method could be a new approach to rapidly locate BMG-forming composition region in multicomponent alloy systems, in which eutectic compositions are difficult to be measured in experiments.

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