Deformation mechanism in nanoindentation of Ti_(63.375)Fe_(34.125)Sn_(2.5) alloy

摘要

Ti_(63.375)Fe_(34.125)Sn_(2.5) alloy was fabricated by arc melting. In this study nanoindentation technology has been used to investigate the mechanical properties of the main component phases (TiFe and p-Ti). It has been found that the β-Ti and the TiFe phases have close values of Young modulus and hardness. The cross section beneath the indent was cut out by focus ion bean (FIB) and analysed by transmission electron microscopy (TEM). It was found that the high strength and limited plasticity of Ti_(63.375)Fe_(34.125)Sn_(2.5) alloy are related to the interaction between dislocation and phase boundary. Phase boundaries stop the dislocation movement in most simulations. Dislocation only can pass through phase interfaces when the conjoint p-Ti and the TiFe phase are in particular orientation relationships.