Effect of grain size on mechanical properties of commercially pure titanium

Abstract

The grain-size dependence of certain mechanical properties of commercially pure titanium under deformation at room temperature is examined. A decrease in the grain size is found to provide a continuous improvement in strength, lower work hardening, and nonmonotonic dependence of the length of the uniform deformation stage. Furthermore, localized deformation in the neck and total plasticity before fracture exhibit a low sensitivity to the grain size. A yield tooth and plateau occur in the flow curve as the structure is reduced down to a certain grain size. The grain-size dependence of the mechanical behavior of the material and its relation to the dislocation redistribution are discussed.