Titanium is the same isomer, the melting point of 1720 ℃, below 882 ℃ was dense hexagonal lattice structure, known as α titanium; 882 ℃ above the body was cubic cube character structure, known as β titanium. By using the different characteristics of the two structures of titanium, the appropriate alloying elements are added to change the phase transition temperature and the phase fraction to obtain different kinds of titanium alloy. At room temperature, titanium alloy has three kinds of matrix structure, titanium alloy is divided into the following three categories: α alloy '(α + β) alloy and β alloy. China, respectively, to TA, TC, TB said.