Thermodynamic Approach for Amorphous Alloys from Binary to Multicomponent Systems

Zhang, Lai-Chang

doi:10.5772/22747

Cited by 6 publications

(4 citation statements)

References 63 publications

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“…From the other side the resistance to crystallization is dependent on the difference in the Gibbs free energies of the amorphous and crystalline phases. The smaller this difference (∆H ୟ୫୭୰୮୦ െ ∆H ୱୱ ) is, the higher is the stability of the amorphous phase [68]. Based on this, a γ ‫כ‬ parameter was proposed [69] as a measure of glass-forming ability (GFA) of alloy systems, defined as…”

Section: Ability To Form Amorphous Alloysmentioning

confidence: 99%

Co-sputtered amorphous Nb–Ta, Nb–Zr and Ta–Zr coatings for corrosion protection of cyclotron targets for [18F] production

Skliarova

Azzolini

Johnson

et al. 2015

Journal of Alloys and Compounds

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Protective corrosion resistant coatings serve for decreasing the amount of ionic contaminants from Havar ® entrance foils of the targets for [ 18 F] production. The corrosion damage of coated entrance foils is caused mainly by the diffusion of highly reactive products of water radiolysis through the protective film towards Havar ® substrate. Since amorphous metal alloys (metallic glasses) are well-known to perform a high corrosion resistance, the glass forming ability, microstructure and diffusion barrier efficiency of binary alloys containing chemically inert Nb, Ta, Zr were investigated. Nb-Ta, Nb-Zr and Ta-Zr films of different alloy composition and ~1.5 μm thickness were co-deposited by magnetron sputtering. Diffusion barrier efficiency tests used reactive aluminum underlayer and protons of acid solution and gallium atoms at elevated temperature as diffusing particles. Though cosputtered Nb-Ta and Nb-Zr alloy films of different contents were crystalline, Ta-Zr alloy was found to form dense amorphous microstructures in a range of composition with 30-73% atomic Ta. The diffusion barrier efficiency of Nb-Zr and Nb-Ta alloy coatings decreased with increase of Nb content. The diffusion barrier efficiency of sputtered Ta-Zr alloy coatings increased with the transition from nanocrystalline columnar microstructure to amorphous for coatings with 30-73% at. Ta.

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Section: Ability To Form Amorphous Alloysmentioning

confidence: 99%

Co-sputtered amorphous Nb–Ta, Nb–Zr and Ta–Zr coatings for corrosion protection of cyclotron targets for [18F] production

Skliarova

Azzolini

Johnson

et al. 2015

Journal of Alloys and Compounds

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show abstract

“…The Hexagonal Closely Packed (HCP), depending on Z, the number of valence elections per atom [13]. It is expected to have only a minor effect when compared with the elastic energy contribution.…”

Section: Validation Of the G Ce Parametermentioning

confidence: 99%

“…In solid solutions, where atoms of different sizes have to occupy equivalent lattice positions, an additional positive contribution to the alloying enthalpy arises due to the lattice deformations, which is necessary to accommodate atoms of different sizes [13].…”

Section: Calculation Of Elastic Enthalpy:(mentioning

confidence: 99%

“…Change in the chemical enthalpy during mixing depends upon three parameters: molar volume, electronegativity and the electron density of the constituent elements [13]. For a binary system, a negative contribution to the chemical enthalpy comes from the electronegativity difference between the two constituents, and a positive contribution comes from their difference in the electron density [14].…”

Section: Calculation Of Chemical Enthalpy: (mentioning

confidence: 99%

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A new thermodynamic parameter GCE for identification of glass forming compositions

Sarwat

Ramya

Ali³

et al. 2015

Journal of Alloys and Compounds

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Exploring Mg-Zn-Ca-Based Bulk Metallic Glasses for Biomedical Applications Based on Thermodynamic Approach

Ramya

Sarwat

Udhayabanu

et al. 2015

Metall Mater Trans A

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Thermodynamic Approach for Amorphous Alloys from Binary to Multicomponent Systems

Cited by 6 publications

References 63 publications

Co-sputtered amorphous Nb–Ta, Nb–Zr and Ta–Zr coatings for corrosion protection of cyclotron targets for [18F] production

Co-sputtered amorphous Nb–Ta, Nb–Zr and Ta–Zr coatings for corrosion protection of cyclotron targets for [18F] production

A new thermodynamic parameter GCE for identification of glass forming compositions

Exploring Mg-Zn-Ca-Based Bulk Metallic Glasses for Biomedical Applications Based on Thermodynamic Approach

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