Recent Development of Effect Mechanism of Alloying Elements in Titanium Alloy Design

The properties of titanium alloy are determined by the chemical composition and microstructure, and the sorts of alloying elements are the main concerns in alloy design. Titanium can be alloyed with various elements to alter its properties, such as high-temperature performance, creep resistance and formability etc. The main objective of this work is to discuss the effect of alloying elements for processing improvement, microstructure optimization and the alloying principle which should be paid attention to in titanium alloy design. Some problems in new alloy design are also discussed and summarized, especially on the interaction of different alloying elements, which leads to the misfit or misorientation dislocations. The interrelationships between alloying composition, phase stability, microstructure and mechanical properties in several classical titanium alloys are critically reviewed.