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

Abstract

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.

Experimental Diffusion Research on BCC Ti-Mn Binary and Ti-Al‐Mn Ternary Alloys

“…They found that the ductility and toughness increased with increasing the Mn content up to 10%, accompanied with the dissolution of the a-stabilizing element Al into the BCC lattice up to about 5 wt.%, serving as indispensable component in high strength titanium alloys. Lu et al [6] concluded that the addition of Al could increase the melting point, obtain the required percentage of a platelets for strengthening or developing bimodal microstructures for fatigue property improvement, and lessen the reactivity of titanium, thus facilitating the casting process.…”

Thermomechanical processing of a near-β titanium alloy and effects on microstructure and tensile properties

“…3c. Meanwhile, owing to the higher Mo equivalent of the alloy (11.1) and the limiting effect of the β-stable element on the α phase, there is no coarsening of the primary α phase [23,26,27]. It can be seen from Figs.…”

Compressive creep behavior of Ti-6Al-4V-xSi-ySc alloys under high-pressure at room temperature

“…1. Sc is α stabilizing element, mainly distributed in the α phase, and has a solid solution strengthening effect on Ti alloys [18,19]. At the same time, Sc reacts with oxygen in the matrix to form Sc 2 O 3 , which is distributed between the lamellar structures and inhibits the movement of the dislocations [20,21].…”