Titanium alloy technology

Titanium alloy is with titanium alloy added other elements. There are two kinds ofdifferent titanium crystal: 882 DEG C for close packed six party structure titanium, 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 titanium bicycle frames phase transition temperature of the element as thealpha 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 titanium bicycle part temperature element for beta stableelements, can divide again isomorphous and eutectoid type two. The application oftitanium alloy products, the former are molybdenum, niobium, vanadium, manganese,chromium; the latter are copper, iron, silicon, etc..

The phase transition temperature has little effect on the element as the neutralelement, a zirconium, tin etc.. Oxygen, nitrogen, carbon and hydrogen are the mainimpurities in titanium alloy. Oxygen and nitrogen has greater solubility in the alphaphase, 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, can be used to remove thevacuum annealing.