Research progress of microstructure transformation and kinetics in Ti2AlNb-based alloy

Abstract

As a new high-temperature structural material，Ti2AlNb-based alloy originated from titanium alloy has excellent room temperature toughness, crack resistance， high temperature strength， oxidation resistance and other advantages， showing a broad application prospect in the aerospace field. To study the microstructure transformation mechanism and related kinetics of Ti2AlNb alloy is of great significance to the alloy composition design and process optimization to obtain the required properties. This paper summarizes the research progress and deficiency of the structure transformation and the dynamic mechanism in Ti2AlNb-based alloy, focuses on the research status of the growth kinetics of B2 phase and O phase at home and abroad in recent years, and points out that there is lack of research on the order disorder transformation kinetics, defect density related dynamics of Ti2AlNb-based alloy. In the future， Ti2AlNb-based alloy needs to be combined with gradually comprehensive dynamics research results to establish a theoretical model of microstructure evolution, so as to optimize alloy composition and process to meet more complex and severe service environment.

Keywords

• ti2alnb-based alloy
• phase transformation
• dynamics
• microstructure regulation