Abstract
Measurements of pearlite growth rate and inter lamellar spacing have been made on isothermally transformed specimens of Cu-11.8 wt pct Al eutectoid alloy. Growth rates which have been calculated on the assumption that volume diffusion in the parent β phase is the rate-controlling process show excellent agreement with the measured values. Directional control of eutectoid growth by translating specimens through steep temperature gradients resulted in the formation of aligned lamellar structures, and the effect of variations in imposed velocity and temperature gradient on alignment has been examined. A comparison of the kinetics of the two modes of transformation has shown that isothermal and isovelocity pearlite growth in this alloy may be readily interrelated. Analysis of the isovelocity growth data supports the conclusion that growth is controlled by volume diffusion.
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