Slip Activation Condition for Each Crystal Grain in Thin Sheet of Polycrystalline Pure Titanium under Tension

Abstract

Thin sheets of pure titanium have been used for medical and dental products and their downsizing seems to be accelerated more and more. On the other hand, it is known that mechanical properties of polycrystalline thin sheet are strongly influenced by microstructures such as the shape and size of grains, crystal orientation, and grain boundaries. In this study, tensile tests were conducted using notched thin sheet specimens of polycrystalline pure titanium and the microscopic inhomogeneous deformation was observed. Tensile deformation mainly occurred by crystallographic slip and the condition of slip activation was examined by Schmidt factor, critical resolved shear stress, and macroscopic stress distribution around the notch.