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Effects of alloying elements on the properties of titanium alloy

The elements that affect titanium alloy are generally divided into: α phase stable element, neutral element and β phase stable element.

The phase stabilizers are the elements that increase the temperature of temperature transition. Common stable phase elements are aluminum, gallium and germanium. It can be seen from the phase diagram that Al element can enlarge the phase area and increase the center-to-center transition temperature. At present, aluminum is the most widely used stable element, which has a significant solid solution strengthening effect and can reduce the melting point, and can play a strengthening effect at room temperature and high temperature. Neutral elements, such as zirconium and tin, have little effect on the phase transition temperature of phase transition. It has a relatively large solubility in α-Ti and β-Ti , and it mainly plays a reinforcing role with other elements.

The tensioning element is the element that lowers the temperature of transition. The stable elements of xiii phase can be divided into two parts: xiii isocrystalline element and xiii sectoid element. Common isomorphic elements include molybdenum, vanadium, etc., which, like aluminum, also have significant solid solution strengthening effects, which can improve the strength of the alloy, maintain good plasticity, and improve the thermal stability of titanium. Meanwhile, critical eutectoid elements can be divided into fast and slow eutectoid elements. The slow eutectoid elements are manganese, iron, chromium and so on. At the same time, they will slow down the eutectoid reaction of the phase of titanium, which cannot be carried out at the general cooling rate, thus strengthening the solid solution of the alloy. The common fast eutectoid elements are silicon, copper, nickel, silver, tungsten, bismuth and so on.
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