Precipitation mechanism in Ag–8wt.% Cu alloy

Precipitation Kinetics and Mechanism in Cu-7 wt% Ag Alloy

“…Differential dilatometry can show effects of precipitation and dissolution by the appearance of various anomalies in the experimental curves, and generally, depending on the lattice parameter and the specific volume variations, these anomalies can be expansions or contractions [9][10][11][12][13][14][15]. However the shape of the dilatometric curve can change if the second phase is a solid solution, which justifies this investigation.…”

“…Last years, differential dilatometry has been extensively used to study the precipitation reactions in different alloys [9][10][11][12][13][14][15]; it has been shown that this method is very sensitive to this kind of phase transformations.…”

Deduction of activation energy for diffusion by analyzing soft impingement in isothermal solid-state precipitation

“…Based on the classical Johnson-Mehl-Avrami (JMA) kinetics, some methods have been proposed to deduce Q so far [8][9][10][11][12][13][14]. For a series of isothermal measurements conducted at different temperatures, corresponding to a given transformed fraction f, Q can be determined plotting log k (k is rate constant) against 1/T, which will yield a straight line with slope as Q/R [8][9][10][11].…”

“…For a series of isothermal measurements conducted at different temperatures, corresponding to a given transformed fraction f, Q can be determined plotting log k (k is rate constant) against 1/T, which will yield a straight line with slope as Q/R [8][9][10][11]. For non-isothermal transformations conducted at different heating rates˚, Q can be deduced using Kissinger's method [12][13][14], i.e., a plot of log(˚/T 2 k ) against −1/T k yields a straight line with slope as Q/R, where, T k is the peak temperature (e.g. in a curve of transformation rate, df/dT) subjected to different .…”

“…in a curve of transformation rate, df/dT) subjected to different . The above recipes have been widely adopted to deduce Q for typical nucleation-growth transformations where hard impingement is considered [8][9][10][11][12][13][14]. For transformations where the soft impingement (overlapping diffusion fields) prevails, few studies have been reported to deduce Q, although some models [15][16][17][18][19] dealing with soft impingement in isothermal solid-state precipitation are available.…”