Effect of Dy Addition on the Microstructure and Mechanical Property of Ti-Nb-Dy Alloys

Abstract

The effects of adding rare-earth element Dy on the microstructure, hardness, and elastic modulus of Ti_78−x Nb₂₂Dyx (x=0.7, 2, and 5) alloys were investigated experimentally. The microstructure of Ti_78−xNb₂₂Dy _x alloys consists of matrix (β phase and α″ martensite) and Dy-rich precipitates. The hardness can be increased with adding an appropriate amount of Dy. The elastic modulus decreases gradually with the increase of Dy fraction.

Keywords

Ti-Nb-Dy / microstructure / hardness / elastic modulus