High temperature titanium alloy and various types of titanium alloy classification and properties

June 19, 2024

The first high-temperature titanium alloy successfully developed in the world was Ti-6Al-4V, with a service temperature of 300-350℃. Subsequently, IMI550, BT3-1 and other alloys with a service temperature of 400 ℃ were successively developed, as well as alloys with a service temperature of 450-500 ℃, such as IMI679, IMI685, Ti-6246, Ti-6242 and other alloys. The new high-temperature titanium alloys that have been successfully applied in aircraft engines are. British IMI829, IMI834 alloy; American Ti-1100 alloy; Russian BT18Y, BT36 alloy and so on. In recent years, foreign countries have developed titanium alloys using rapid solidification/powder metallurgy technology, fibre or particle reinforced composite materials as the development direction of high-temperature titanium alloys, so that the use of titanium alloys can be increased to more than 650 ℃. The United States McDonnell Douglas company using rapid solidification / powder metallurgy technology Chi Gong developed a high purity, high density titanium alloy, at 760 ℃ its strength is equivalent to the current room temperature using titanium alloy strength.

Titanium-aluminium compound based titanium alloys

Compared with general titanium alloys, titanium aluminium compounds based sodium Ti3Al (α2) and TiAl (γ) intermetallic compounds have the advantages of good high temperature performance (using temperature of 816 and 982 ° C, respectively), oxidation resistance, creep resistance and light weight (density is only 1/2 of the nickel-based high-temperature alloys), and these advantages make it become a competitive material for the future of aero-engine and aircraft structural components. At present, there are two Ti3Al-based titanium alloys Ti-21Nb-14Al and Ti-24Al-14Nb-#v-0.5Mo in the United States began mass production. Other Ti3Al-based titanium alloys developed in recent years include Ti-24Al-11Nb, Ti25Al-17Nb-1Mo, and Ti-25Al-10Nb-3V-1Mo, etc. The compositional range of interest for TiAl(γ)-based titanium alloys is TAl-(1-10)M (at.%), where M is at least one of v, Cr, Mn, Nb, Mn, Mo and at least one of the elements W. More recently, TiAl3-based titanium alloys have begun to attract attention, such as the Ti-65Al-10Ni alloy.

High strength and high toughness β-type titanium alloy

β-type titanium alloy was first developed in the mid-1950s by the U.S. Crucible company B120VCA alloy (Ti-13v-11Cr-3Al). β-type titanium alloy has good hot and cold machining properties, easy to forge, can be rolled, welded, can be solid solution - aging treatment to obtain high mechanical properties, good environmental resistance and strength and fracture toughness of the very good match. . New high-strength and high-toughness β-type titanium alloy representative of the following: Ti1023 (Ti-10v-2Fe-#al), the alloy and aircraft structural components commonly used in the performance of 30CrMnSiA high-strength structural steel is comparable to the forging performance; Ti153 (Ti-15V-3Cr-3Al-3Sn), the alloy's cold-working performance is better than the industrial titanium, the cold-working performance of the alloy is better than the industrial titanium. Room temperature tensile strength after aging can reach more than 1000MPa; β21S (Ti-15Mo-3Al-2.7Nb-0.2Si), the alloy is a new type of oxidation-resistant, ultra-high-strength titanium alloys developed by the Timet Division of the U.S. Titanium Metal Company, with good oxidation resistance, good hot and cold machining performance, can be made into a foil with a thickness of 0.064mm; Japan Pipe (NKK) successfully developed SP-700 (Ti-4.5Al-3V-2Mo-2Fe) titanium alloy, the alloy has high strength, superplastic elongation of up to 2000%, and superplastic forming temperature is 140 ℃ lower than that of Ti-6Al-4V, which can be used to replace Ti-6Al-4V alloy with superplastic forming - diffusion connection (SPF/DB) technology to manufacture a variety of aerospace Components; Russia developed BT-22 (TI-5v-5Mo-1Cr-5Al), its tensile strength up to 1105MPA above.

Flame retardant titanium alloy

Conventional titanium alloys have a tendency to ignite alkanes under specific conditions, which largely limits their applications. In response to this situation, all countries have launched research on flame retardant titanium alloys and made certain breakthroughs. Qiang developed Alloy c (also known as T nominal composition of 50Ti-35v-15Cr (mass fraction), is a continuous combustion insensitive flame-retardant titanium alloy, has been used in the F119 engine. BTT-1 and BTT-3 for the Russian development of flame-retardant titanium alloys, are Ti-Cu-Al alloys, has a fairly good thermal deformation process performance, can be used to make complex parts. BTT-1 and BTT-3 are flame retardant titanium alloys developed by Russia.
Medical Titanium Alloy

Titanium Materials is non-toxic, lightweight, strong and has excellent biocompatibility, making it a very desirable medical metal material for use as implants in the human body, among other things. At present, it is still the Ti-6Al-4v ELI alloy that is widely used in the medical field. However, the latter will precipitate a very small amount of vanadium and aluminium ions, reducing its cellular adaptability and may cause harm to the human body, this problem has long caused widespread concern in the medical community. As early as in the mid-1980s, the United States began to develop aluminium-free, vanadium-free, biocompatible titanium alloys for orthopaedic surgery. Japan, the United Kingdom and other countries have also done a lot of research work in this area and made some new progress. For example, Japan has developed a series of α+β titanium alloys with excellent biocompatibility, 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 have better corrosion strength, fatigue strength and corrosion resistance than Ti-6Al-4v ELI. Compared with α + β titanium alloys, β titanium alloys have higher strength waterwise and better incisional properties and toughness, which are more suitable for implantation into the human body as implants. In the U.S., five β titanium alloys have been recommended for medical applications, namely, 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. It is estimated that in the near future, such titanium alloys with high strength watercourses, as well as better incision properties and toughness, will be more suitable for implantation into the human body than α+β titanium alloys. In the near future, such hut titanium alloys with high strength, low modulus of elasticity, and excellent formability and corrosion resistance are likely to replace Ti-6Al-4V ELI alloys, which are currently widely used in the medical field.

Author:

Mr. negan

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negan@qyx-metal.com

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