Complex SRO isothermal kinetics in quenched Cu-12 at.% Mn assessed by microhardness measurements
作者： A. Varschavsky , E. Donoso , G. Díaz
DOI: 10.1016/J.MSEA.2005.09.061
关键词: Materials science 、 Kinetics 、 Chemical equation 、 Arrhenius equation 、 Kinetic energy 、 Activation energy 、 Rate equation 、 Annealing (metallurgy) 、 Arrhenius plot 、 Thermodynamics
摘要: Abstract The isothermal kinetics of the return short-range-order (SRO) in quenched Cu–12 at.% Mn alloy samples subsequently annealed at various temperatures was analyzed by means microhardness measurements. An apparent first-order kinetic function is suitable for describing overall kinetics. Deviations from straight line Arrhenius plot were unequivocally detected. Apparent activation energy values, which lie between those defect migration unbound and bound vacancies, approach to that ones as annealing temperature raised. compensation effect CE also confirmed. By using an isoconversional equation can be concluded degree conversion independent energy. deviation isotherms a formal mechanistic interpreted terms entangled parallel reactions contributed vacancies. use single step rate reaction operative one, it done here, instead true complex process involving multistep often applied analysis.
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