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Tytuł pozycji:

Heat treatment and kinetics of precipitation of β-Mg17Al12 phase in AZ91 alloy.

Tytuł:
Heat treatment and kinetics of precipitation of β-Mg17Al12 phase in AZ91 alloy.
Autorzy:
Fatmi, M.
Djemli, A.
Ouali, A.
Chihi, T.
Ghebouli, M.A.
Belhouchet, H.
Źródło:
Results in Physics; Sep2018, Vol. 10, p693-698, 6p
Czasopismo naukowe
Highlights • The kinetics of precipitation reaction is faster with the temperature range (220–370 °C). • The activation energies, measured after isothermal and non-isothermal treatments were around 67.18 and 62.02 kJ/mol, respectively. • The Avrami parameters of growth morphology using non-isothermal and isothermal treatments were around 3.19 and 2.79, respectively. Abstract This study investigated the effect of aging on the precipitation and kinetics of second phase Mg 17 Al 12 in AZ91 magnesium alloy (Mg-9 wt% Al-1 wt% Zn), using X-ray diffraction, microhardness measurements and differential scanning calorimetric analysis (DSC). With the last instrument, the all samples were heated from room temperature to 400 °C, at heating rates of 10–30 °C/min. The results were supplemented by measuring the average of activation energies, using isothermal treatments by Johnson–Mehl–Avrami (JMA) methods and by non-isothermal treatments using Ozawa, Boswell, Kissinger, Mahadevan, Augis and Bennett methods, were around 67.18 and 62.02 kJ/mol. The frequency factor k 0 calculated by the isothermal treatment is equal to 1.24 109 s−1. In non-isothermal treatment, the numerical factor m and the Avrami parameter n is estimated to be approximately equal to 3 and 2.79 respectively. This value corresponding that the bulk nucleation with a constant number of nuclei was dominant in three-dimensional (polyhedron) controlled by interface reaction. [ABSTRACT FROM AUTHOR]
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