Crystallization of Fe, Co and Ni based metallic glasses

Coleman, E.

doi:10.1016/0025-5416(76)90187-7

Cited by 59 publications

(13 citation statements)

References 4 publications

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“…Eq. (7) indicates that the apparent activation energy of glass transition is directly proportional to crystallization temperature, but inversely to glass transition temperature in the present Fe based amorphous alloys, It is very different from previously reported results [5,6], in which apparent activation energy of glass transition was deduced from structural relaxation model to be approximately directly proportional to glass transition temperature. In order to confirm correlation between E g and T g in the Fe based amorphous alloy, the E g as a function of T g for the amorphous FCZBN and FBZN alloys is plotted on Fig.…”

Section: Resultscontrasting

confidence: 74%

“…Its physical meaning and correlation with T g , T x and GFA have been interesting subjects in amorphous alloy investigations. Some efforts have been made to set up a correlation between E g and T g [5,6], or characterize GFA by combining some parameters, which can be measured by the nonisothermal scanning technique together with some suitable method or equation [7,8]. However, it is still lacking in comprehensive understanding of E g and relationships between T g , T x , E g and GFA.…”

Section: Introductionmentioning

confidence: 98%

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Correlations between apparent activation energy and thermostability and glass forming ability for Fe based metallic glasses

Zhang

Tan

et al. 2008

Journal of Non-Crystalline Solids

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Section: Resultscontrasting

confidence: 74%

Section: Introductionmentioning

confidence: 98%

Correlations between apparent activation energy and thermostability and glass forming ability for Fe based metallic glasses

Zhang

Tan

et al. 2008

Journal of Non-Crystalline Solids

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“…This rapid crystallization also prevents one from measuring the viscosity and other properties of its equilibrium liquid. Examples of materials that crystallize rapidly soon after the onset of their T g endotherm are vapor-deposited CCl 4 (see Table in ref ) and a variety of hydrocarbons, − hyperquenched metal alloys (atomic glasses of high fictive temperatures), − ,− ,, ASW, HGW, ,, mechanically amorphized solid 1,3,5-tri-α-naphthylbenzene (a molecular glass), , etc. When such amorphous solids already contain crystal nuclei or microcrystals or both on their surface or in their bulk, they crystallize even more rapidly on heating, as, for example, some glassy metal alloys, and ASW, HGW, ,, and mechanically amorphized solids. − …”

Section: High-enthalpy Amorphous Solids and Their Thermodynamicsmentioning

confidence: 99%

“…It should be noted that several glasses have been found to crystallize also at T below their T g , but only after having been kept for a long period at that T . Among these are a few Ni-based, hyperquenched metal alloy glasses, , which crystallize incongruently and relatively slowly over a period of several hours to several days when kept at temperatures slightly below T g . Our scrutiny of the calorimetric data on these glasses has shown that the ratio of the crystallization temperature of their unannealed state to T g is 0.99 for Ni 75 P 16 B 6 Al 3 , 0.91 for Fe 40 Ni 40 B 20 , and 0.97 for Fe 40 Ni 40 P 14 B 6 .…”

Section: High-enthalpy Amorphous Solids and Their Thermodynamicsmentioning

confidence: 99%

Calorimetric Features of High-Enthalpy Amorphous Solids and Glass-Softening Temperature of Water

Johari

2003

J. Phys. Chem. B

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In the differential scanning calorimetry (DSC) scans of the annealed states of vapor-deposited, hyperquenched, and crystal-amorphized solids, the glass-softening or T g endotherm is interrupted by the crystallization exotherm, thus making the T g endotherm appear like a rounded peak. This apparent peak is occasionally misidentified as a sub-T g peak, which appears in the 0.7T g to 0.8T g range in the DSC scan of glasses preannealed at a specific temperature, T ann. To help prevent such misidentification, we provide four criteria for distinguishing the apparent peak of the T g endotherm from a sub-T g peak: (i) Crystallization occurs in the T g endotherm range or at T just above it, and not in the sub-T g peak range. (ii) The T g endotherm onset occurs at T > T ann, but the sub-T g peak onset occurs at T ann. (iii) Unannealed glasses show a T g endotherm; only preanneal ed glasses show the sub-T g peak, and the height of the sub-T g peak and its area vary when T ann and the annealing time are varied. (iv) Slope of the DSC scan may decrease, become zero or become negative prior to the onset of the T g endotherm, but it does not decrease and remains positive prior to the onset of sub-T g peak. The annealed state of hyperquenched glassy water is known to crystallize in the 142−150 K range of its endotherm, the onset temperature of the endotherm is higher than T ann, its unannealed state shows the T g endotherm, and the slope of the scan prior to the onset temperature is not always positive. These observations remove the basis for a recent conjecture that the T g of water is between 165 and 180 K, and is unobservable. Available calorimetric data on vapor-deposited, hyperquenched, and mechanically amorphized solids have shown a T g endotherm partially superposed by the crystallization exotherm, but T g itself does not change. It is proposed that intermediate states formed during the occurrence of disorder−order transitions in solids and in proteins can be studied in the time domain by using their hyperquenched glassy and mechanically amorphized states.

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“…Stability of these glasses increases with the As content or with decreasing Te content (i) temperature a t the onset of crystallization T, [19]; (ii)…”

Section: 5and)mentioning

confidence: 99%

Thermal properties and crystallization processes in semiconducting AlAsTe glasses

Colmenero¹,

Barandiarán²

1980

Phys. Stat. Sol. (a)

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Glasses in the Al–As–Te system are prepared and characterized. DSC and X‐ray studies of the crystallization are also performed. The kinetic parameters (activation energy and Avrami index) are obtained in non‐isothermal conditions by a method previously described. Diffusion mechanisms are responsible for the crystallization and an activation energy of about 1.5 eV is found for the diffusion of Te. The Al content is shown to increase the stability of the glasses, while high Te content favours phase separation and As contributes to the structural rigidity in these compounds. The glass forming system is found to be of technological interest.

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Crystallization of Fe, Co and Ni based metallic glasses

Cited by 59 publications

References 4 publications

Correlations between apparent activation energy and thermostability and glass forming ability for Fe based metallic glasses

Correlations between apparent activation energy and thermostability and glass forming ability for Fe based metallic glasses

Calorimetric Features of High-Enthalpy Amorphous Solids and Glass-Softening Temperature of Water

Thermal properties and crystallization processes in semiconducting AlAsTe glasses

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