Avrami exponent of crystallization in metallic glass Cu73.8P13.8Ni8.3Sn4.1

Zhaosheng, Tan; Zhang, Bangwei; Hen, Zhang

doi:10.1007/bf01105099

Cited by 10 publications

(6 citation statements)

References 6 publications

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“…where k 0 is a constant, E a is the activation energy, k B is the Boltzmann constant and T is the temperature [18]. Interpretation of the results presented above is as follows: Sn, Cu and C atoms diffuse, which can result in the formation of small grained regions of Cu 6 Sn 5 .…”

Section: Resultsmentioning

confidence: 83%

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Room temperature crystallization kinetics of amorphous Cu6Sn5+C alloys

Thorne

Dahn

Obrovac

et al. 2011

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 83%

“…Other Cu-based alloys have been found to recrystallize to form larger grains of pure Cu at room temperature [15][16][17][18]. Room temperature crystallization of electroplated amorphous Cu at room temperature has been observed with initial thicknesses on the 0925-8388/$ -see front matter © 2011 Elsevier B.V. All rights reserved.…”

Section: Introductionmentioning

confidence: 97%

Room temperature crystallization kinetics of amorphous Cu6Sn5+C alloys

Thorne

Dahn

Obrovac

et al. 2011

Journal of Alloys and Compounds

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“…Another way of calculating n from non-isothermal data has been proposed by Zhaosheng and co-workers, 23 who propose that by choosing two different heating rates and calculating the fraction transformed at the same temperature, the Avrami exponent can be calculated by:…”

Section: Resultsmentioning

confidence: 99%

“…The method of Zhaosheng et al 23 is by far the easiest method for determining the Avrami exponent and does not rely on knowledge of the activation energy. The applicability of both the non-isothermal and isothermal methods of the Avrami exponent suggests that nucleation is random and the growth rate is linear.…”

Section: Resultsmentioning

confidence: 99%

“…22 Other methods for determining the n exponent and E a from nonisothermal experiments have also been proposed. 23 A further aim of this paper is to compare and evaluate the results for n from isothermal and various non-isothermal techniques for a selected ionic liquid. Three ionic liquids with three different anions and cations have been selected as they are commonly studied ionic liquids with well-defined synthesis and purification methods.…”

Section: Introductionmentioning

confidence: 99%

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Crystallisation kinetics of some archetypal ionic liquids: isothermal and non-isothermal determination of the Avrami exponent

Izgorodina

Dargusch

MacFarlane

2011

Phys. Chem. Chem. Phys.

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The properties of ionic liquids give rise to applications in diverse technology areas including mechanical engineering, mining, aerospace and defence. The arbitrary physical property that defines an ionic liquid is a melting point below 100 °C, and as such, an understanding of crystallisation phenomena is extremely important. This is the first report dealing with the mechanism of crystallisation in ionic liquids. Assuming crystallisation of the ionic liquids is a thermal or mass diffusion-controlled process, the values of the isothermal Avrami exponent obtained from three different ionic liquids with three different anions and cations all indicate that growth occurs with a decreasing nucleation rate (n=1.8-2.2). For one of the ionic liquids it was possible to avoid crystallisation by fast cooling and then observe a devitrification upon heating through the glass transition. The isothermal Avrami exponent of devitrification suggested growth with an increasing nucleating rate (n=4.1), compared to a decreasing nucleation rate when crystallisation occurs on cooling from the melt (n=2.0). Two non-isothermal methods were employed to determine the Avrami exponent of devitrification. Both non-isothermal Avrami exponents were in agreement with the isothermal case (n=4.0-4.15). The applicability of JMAK theory suggests that the nucleation event in the ionic liquids selected is a random stochastic process in the volume of the material. Agreement between the isothermal and non-isothermal techniques for determining the Avrami exponent of devitrification suggests that the pre-exponential factor and the activation energy are independent of thermal history. The heating rate dependence of the glass transition enabled the calculation of the fragility index, which suggests that the ionic liquid is a "strong" glass former. This suggests that the temperature dependence of the rate constant could be close to Arrhenius, as assumed by JMAK theory. More generally, therefore, it can be concluded that there is nothing unusual about the crystallisation mechanism of the ionic liquids studied here.

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Investigation of rapidly quenched Cu100−xPx alloys

Zhang

1993

Physica B: Condensed Matter

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Avrami exponent of crystallization in metallic glass Cu73.8P13.8Ni8.3Sn4.1

Cited by 10 publications

References 6 publications

Room temperature crystallization kinetics of amorphous Cu6Sn5+C alloys

Room temperature crystallization kinetics of amorphous Cu6Sn5+C alloys

Crystallisation kinetics of some archetypal ionic liquids: isothermal and non-isothermal determination of the Avrami exponent

Investigation of rapidly quenched Cu100−xPx alloys

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