Crystallization kinetics of a high-zirconium-based glassy alloy: A DSC study

Nengbin Hua; Wenzhe Chen; Xiaoli Liu; Tao Zhang

doi:10.1007/s11595-016-1351-6

Journal of Wuhan University of Technology Materials Science Edition ›› 2016, Vol. 31 ›› Issue (1) : 191 -196. DOI: 10.1007/s11595-016-1351-6

Metallic Materials

Crystallization kinetics of a high-zirconium-based glassy alloy: A DSC study

Nengbin Hua ¹^,²^,^{^a}
, Wenzhe Chen ¹^,²
, Xiaoli Liu ²
, Tao Zhang ³

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Abstract

The non-isothermal and isothermal crystallization kinetics of Zr_72.5Al₁₀Fe_17.5 glassy alloy was investigated using differential scanning calorimeter (DSC). Under non-isothermal heating condition, the primary phase in the initial crystallization is Zr₆Al₂Fe phase and the final crystallized products consist of Zr₆Al₂Fe, Zr₂Fe and a-Zr phases. The apparent activation energy for crystallization estimated using the Kissinger method is 342.1 ± 8.1 kJ/mol. The local activation energy decreased with the increase in the crystallization volume fraction during nonisothermal crystallization. Under isothermal heating condition, the average Avrami exponent of about 2.76 implies a mainly diffusion-controlled three-dimensional growth with an increasing nucleation rate. The local activation energy for isothermal crystallization shows a different variation trend from that for nonisothermal crystallization, indicating different nucleation-and-growth mechanisms for the two crystallizaiton conditions.

Keywords

glassy alloys / crystallization / activation energy / avrami exponent

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Nengbin Hua, Wenzhe Chen, Xiaoli Liu, Tao Zhang. Crystallization kinetics of a high-zirconium-based glassy alloy: A DSC study. Journal of Wuhan University of Technology Materials Science Edition, 2016, 31(1): 191-196 DOI:10.1007/s11595-016-1351-6

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