The tensile modulus of industrial pure titanium is 105 ~ 109GPa. The tensile modulus of most titanium alloys in the annealing state is 110 ~ 120GPa. The tensile modulus of aged hardened titanium alloy is slightly higher than that of annealed titanium alloy, and the compressive modulus is equal to or greater than the tensile modulus. The specific elastic modulus of titanium alloy is equal to that of aluminum alloy, only second to beryllium, molybdenum and some superalloys.
The torsion or shear modulus of industrial pure titanium is 46GPa, and the shear modulus of titanium alloy is 43-51gpa. In order to improve the strength of titanium alloy, increasing the content of interstitial material will have harmful effects on the impact resistance and fracture toughness of the alloy. According to the type and state of titanium alloy, the xia notch impact strength value of denatured industrial pure titanium is 15 ~ 54J/㎡, and the casting state is about 4 ~ 10J/㎡. The impact strength of titanium alloy in the annealing state is 13 ~ 25.8j /㎡, and the aging state is slightly lower. The v-notch impact strength of Ti-5Al-2.5Sn in casting state is 10J/㎡, and that of Ti-6Al-4V is 20-23J /㎡. The lower the oxygen content of the titanium alloy, the higher the value.
Many titanium alloys have high fracture toughness, or the ability of titanium alloys to resist crack propagation. Ti-6Al-4V in annealed state is a kind of excellent toughness material. When the notch concentration coefficient Kt=25.4mm, the ratio of notched tensile strength to non-notched tensile strength is greater than 1.
Titanium alloys can maintain certain performance at high temperatures. General industrial titanium alloy can maintain its performance at 540℃, but can only be used for a short time, long enough temperature range is 450 ~ 480℃. Titanium alloys have been developed for use at 600℃. As a missile material, titanium alloy can be used at 540℃ for a long time and 760℃ for a short time.
