Classification of titanium alloy’s application

Aug. 12, 2011 - PRLog -- Titanium can be divided according to application:
(1) high temperature titanium alloy. The world's first successful development of high temperature titanium alloy is Ti-6Al-4V, using temperature is 300-350 ℃. Then developed a using temperature of 400 ℃ for IMI550, BT3-1 alloy, and the using temperature of 450 ~ 500 ℃ for IMI679, IMI685, Ti-6246, Ti-6242 alloy. Has been successfully applied in military and civil aircraft engines in the new high temperature titanium alloy with the UK IMI829, IMI834 alloy; U.S. Ti-1100 alloy; Russia BT18Y, BT36 alloy etc.
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(2)Titanium alloy based of titanium-aluminum compounds. Compared with the general titanium alloy, the biggest advantages of titanium-aluminum-based sodium Ti3Al (α2) and TiAl (γ) intermetallic compounds is the high temperature performance (maximum temperatures of 816 and 982 ℃), antioxidant ability, anti-creep performance and light weight (only 1/2 density of nickel-based superalloy), these advantages make it become the most competitive materials of future of aircraft engines and aircraft structural parts. Currently, there are two alloy of Ti3Al based titanium alloy Ti-21Nb-14Al and Ti-24Al-14Nb-# v-0.5Mo start mass production in the United States. Other developments in recent years of titanium alloy based of Ti3Al are Ti-24Al-11Nb, Ti25Al-17Nb-1Mo and Ti-25Al-10Nb-3V-1Mo and so on. The composition ranges of TiAl (γ)-based titanium alloy are Ti-(46-52) Al-(1-10) M (at.%), where M is at least one element of v, Cr, Mn, Nb, Mn, Mo and W. Recently, TiAl3 based titanium alloy begun to attract attention, such as Ti-65Al-10Ni alloy.
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(3) β-type high strength and toughness titanium alloy. β-type titanium alloy was first developed in the mid-1950s by the American Crucible company of B120VCA alloy (Ti-13v-11Cr-3Al). β-type titanium alloy has good performance of hot and cold processing property, easy to forge, can be rolled, welded, through the solution - aging treatment to obtain high mechanical properties, good environmental resistance and a good match of strength and fracture toughness. The most representative of New β-type high strength and high toughness titanium alloy are the following: Ti1023 (Ti-10v-2Fe-# al), this material has the quite performance of high-strength with the 30CrMnSiA what aircraft structural components of the alloy used in structural steels, With excellent forging performance. Ti153 (Ti-15V-3Cr-3Al-3Sn), this alloy have better cold processing performance than the industry pure titanium, the room temperature tensile strength after aging can ge 1000MPa above. β21S (Ti-15Mo-3Al-2.7Nb-0.2Si), this alloy was developed by the U.S. Titanium metal Company Timet Division, it is a new type of antioxidant, high strength titanium alloy with good oxidation resistance, excellent hot and cold processing, and can be made of foil thickness of 0.064mm material; Japan steel company (NKK) the successful develop the SP-700 (Ti-4.5Al-3V-2Mo-2Fe) titanium alloy, the alloy have high strength super plastic elongation as up to 200%, and the super plastic forming temperature lower than the Ti-6Al-4V as 140℃, can replace the 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), its tensile strength can be up to 1105MPA.

(4) Flame retardant titanium alloy. Conventional titanium alloys under certain conditions have the tendency of burning methane, which largely limits its application. In response, countries have started research on flame retardant titanium alloy and made some breakthrough. The united state developed the Alloy c (also known as Ti-1720), nominal composition of 50Ti-35v-15Cr (mass), is a continuous burning of the flame retardant and is not sensitive to titanium, has been used for F119 engine. BTT-1 and BTT-3 flame titanium alloy developed in Russia, both Ti-Cu-Al alloy, with very good thermal deformation process performance, can be made into complex parts.

(5) Medical titanium alloy. Titanium non-toxic, light weight, high strength and excellent biocompatibility, is ideal for medical metal materials can be used as implanted human implant and so on. At present, widely used in the medical field is still Ti-6Al-4v ELI alloy. But the latter will precipitate a very small amount of vanadium and aluminum ions, reducing its cell adaptation and may cause harm to humans, this issue has already caused widespread concern in the medical profession. The America as early as the mid-1980s began to develop aluminum-free, non-vanadium, biocompatible titanium alloy, to be used in orthopedic surgery. Japan and the United Kingdom have also done a lot of research work and made some new progress. For example, Japan has developed a series of excellent biocompatibility of the α + β titanium alloys, including Ti-15Zr-4Nb_4ta-0.2Pd, Ti-15Zr-4Nb-aTa-0.2Pd-0.20 ~ 0.05N, Ti-15Sn -4Nb-2Ta-0.2Pd and Ti-15Sn-4nb-2Ta-0.2Pd-0.20, these alloys are corrosion strength, fatigue strength and corrosion resistance are superior to Ti-6Al-4v ELI. Compared with the α + β titanium alloy, β titanium alloy with higher strength of water as well as better performance and toughness of the incision, more suitable as implants implanted in the body. In the United States, five kinds of β titanium alloys are recommended to the medical field, that TMZFTM (TI-12Mo-^ Zr-2Fe), Ti-13Nb-13Zr, Timetal 21SRx (TI-15Mo-2.5Nb-0.2Si), Tiadyne 1610 (Ti-16Nb-9.5Hf) and Ti-15Mo. Estimated in the near future, such high strength, low elastic modulus and excellent formability and corrosion resistance of titanium is likely to replace the current House area of medicine widely used Ti-6Al-4V ELI alloy.
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