Evaluation of the critical size for the nucleation of precipitates in AlZn alloys

Abstract

On the basis of Becker's classical theory of nucleation and evaluations of the volume, surface, and coherency stress parts of the free enthalpy, the critical sizes for the homogeneous nucleation of fully coherent Guinier‐Preston zones as well as precipitates of the partially coherent α′m‐phase are calculated. In addition the heterogeneous nucleation of precipitates at edge dislocations is considered. The obtained results agree well with experimental observations.

Determination of the critical nucleus size of precipitates using the macroscopic composition gradient method

“…[6] dependence of the critical nucleus size. [7,8,9] Such discrepancies are caused by not only the insufficiency in theories but also by the lack of appropriate II. [7,8,9] Such discrepancies are caused by not only the insufficiency in theories but also by the lack of appropriate II.…”