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Study of Precipitation Kinetics in Al-3.7 wt% Cu Alloy during Non-Isothermal and Isothermal Ageing
並列摘要
Studies of transformation kinetics during ageing of Al-3.7 wt% Cu were performed by use of X-ray diffraction and Differential Scanning Calorimetry (DSC) methods at different heating rates. Both non-isothermal and isothermal ageing processes were conducted in order to determine the isothermal transformation kinetics based on the JMA (Johnson-Mehl-Avrami) equation and the Avrami exponent, n, whose mean is ∼ 1:78. The frequency factor calculated by the isothermal treatment is ∼ 1:65×10^6 s^(−1). The activation energy of discontinuous precipitation has been calculated according to the three models proposed by Kissinger, Ozawa, and Boswell.
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