① High specific strength (tensile strength/density) (see picture), the tensile strength can reach 100-140kgf/mm2, while the density is only 60% of steel.
②It has good strength at medium temperature, and its service temperature is several hundred degrees higher than that of aluminum alloy. It can still maintain the required strength at medium temperature, and can work for a long time at a temperature of 450-500°C. ③ Good corrosion resistance, a layer of uniform and dense oxide film is formed immediately on the surface of titanium in the atmosphere, which has the ability to resist erosion by various media. Generally, titanium has good corrosion resistance in oxidizing and neutral media, and has better corrosion resistance in seawater, wet chlorine and chloride solutions. However, in reducing media, such as hydrochloric acid and other solutions, the corrosion resistance of titanium is poor. ④ Titanium alloys with good low-temperature performance and extremely low interstitial elements, such as TA7, can maintain certain plasticity at -253°C. ⑤Low elastic modulus, small thermal conductivity, non-ferromagnetic. 6. High hardness. 7. Poor punchability, good thermoplasticity. Heat treatment Titanium alloys can obtain different phase compositions and structures by adjusting the heat treatment process. It is generally believed that the fine equiaxed structure has good plasticity, thermal stability and fatigue strength; the acicular structure has high durability strength, creep strength and fracture toughness; the equiaxed and acicular mixed structure has good comprehensive properties. Commonly used heat treatment methods include annealing, solid solution and aging treatment. Annealing is to eliminate internal stress, improve plasticity and structural stability, so as to obtain better comprehensive properties. Usually the annealing temperature of α alloy and (α+β) alloy is selected at 120-200°C below the (α+β)-→β phase transition point; solid solution and aging treatment are rapidly cooled from the high temperature zone to obtain martensite α′ Phase and metastable β phase, and then keep warm in the medium temperature zone to decompose these metastable phases to obtain fine dispersed second phase particles such as α phase or compound, so as to achieve the purpose of strengthening the alloy. Usually (α+β) alloys are quenched at 40-100°C below the (α+β)-→β phase transition point, and metastable β-alloys are quenched at 40-80°C above the (α+β)-→β phase transition point conduct. The aging treatment temperature is generally 450-550°C. In addition, in order to meet the special requirements of the workpiece, the industry also adopts metal heat treatment processes such as double annealing, isothermal annealing, β heat treatment, and deformation heat treatment.
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