Titanium alloy

Titanium alloy is with titanium alloy added other elements. There are two kinds of different titanium crystal: 882 DEG C for close packed six party structure titanium pumps , 882 DEG C beta titanium as the body centered cubic. Alloy elements according to their influence on the phase transition temperature can be divided into three categories:

A stable alpha phase, increase the phase transition temperature of the element as the alpha stable elements, aluminum, carbon, oxygen and nitrogen. The aluminum is the main alloy titanium alloy elements, it is to reduce the quality of the alloy at room temperature and high temperature strength, elastic modulus, increase proportion has obvious effect.

The stability of beta phase, reduce the transition temperature element for beta stable elements, can divide again isomorphous and eutectoid type two. The application of titanium alloy pump alloy products, the former are molybdenum, niobium, vanadium; the latter with chromium, manganese, copper, iron, silicon, etc..

The phase transition temperature has little effect on the element as the neutral element, a zirconium, tin etc.. Oxygen, nitrogen, carbon and hydrogen are the main impurities in titanium alloy. Oxygen and nitrogen has greater solubility in the alpha phase, there are significant strengthening effect of titanium alloy, but the plasticity decreased. Usually the provisions of oxygen and nitrogen in titanium content in 0.15 ~ 0.2% and 0.04 ~ 0.05% below. The solubility of hydrogen in the alpha phase is very small, too much dissolved in titanium alloy hydride hydrogen will be produced, the alloy brittle. Usually in titanium alloy hydrogen content of 0.015% control in the following. Dissolved hydrogen in titanium is reversible and can be used to remove the vacuum annealing.