Modelling Dependency of the Steady-State Grain Size on the Stacking Fault Energy in Severely Plastic Deformed Materials

In the present work, a computer-based method is proposed to investigate the relationship between the steady-state grain size (ds) and stacking fault energy (SFE) in severely plastic deformed (SPDed) materials. The stacking fault energy, γ, plays an important role in determining the mechanical properties of face-centered cubic (fcc) metals. A number of models have been proposed to show this role. These models have several shortcomings, including complex computational variables, data constraints and small computational range constraints. The present model compatible with experimental results does not employ hard calculable variables. Besides, it is applicable not only for pure metals but also for alloys. The squared regression (R۲) and error sum of squares (SSE) for the training and testing data of the presented model are ۰.۹۳, ۰.۰۰۰۶ and ۰.۹۸, ۰.۰۰۰۱۸, respectively, which indicates the high accuracy of the proposed model. The slope of the  versus  is about ۰.۶۴۵۳ which is comparable to all the models offered in this field.

کلیدواژه ها:

GEP-Modelling ، Severe Plastic Deformation (SPD) ، stacking fault energy (SFE) ، Steady-state grain size