high strength and high toughness β-type titanium alloy.

β-type titanium alloy was first used by the mid-1950s, the company developed the American Crucible B120VCA alloy (Ti-13v-11Cr-3Al). β-type titanium alloy has good hot and cold processing performance, forging, can be rolled, welded, through the solution - get high mechanical properties, good environmental resistance and strength and fracture toughness of a good match aging treatment. The new β-type titanium alloy high strength and high toughness most representative are the following [26'30]:
   Ti1023 (Ti-10v-2Fe- # al), the alloy commonly used in aircraft structures 30CrMnSiA performance is quite high strength structural steel, forging excellent performance;
   Ti153 (Ti-15V-3Cr-3Al-3Sn), the alloy cold better performance than commercially pure titanium, room temperature tensile strength after aging up to 1000MPa or more;
   β21S (Ti-15Mo-3Al-2.7Nb-0.2Si), a new anti-oxidation of the alloy is titanium metal by the US division of the company Timet developed, ultra high strength titanium alloy, has good oxidation resistance, hot and cold workability quality, can be made of a thickness of 0.064mm foil;
Japan Steel Company (NKK) the successful development of SP-700 (Ti-4.5Al-3V-2Mo-2Fe) titanium alloy, the alloy high strength, superplastic elongation up to 2000%, and the superplastic forming temperature than the Ti-6Al- 4V low 140 ℃, can replace Ti-6Al-4V alloy with super plastic forming - diffusion Bonding (SPF / DB) technology to produce a variety of aerospace components;
   Russia developed the BT-22 (TI-5v-5Mo-1Cr-5Al), the tensile strength of up to more than 1105MPA