Properties of Novel High Temperature Titanium Alloys for Aerospace Applications

The attractive combination of strength and low density has resulted in titanium alloys covering 15 to 25% of the weight of a modern jet engine, with titanium currently being used in fan, compressor and nozzle components. Typically, titanium alloys used in jet engine applications are selected from the group of near alpha and alpha-beta titanium alloys, which exhibit superior elevated temperature strength, creep resistance and fatigue life compared to typical titanium alloys such as Ti-6Al-4V. Legacy titanium alloys for elevated temperature jet engine applications include Ti-5Al-2Sn-2Zr-4Mo-4Cr, Ti-6Al-2Sn-4Zr-2Mo-0.1Si and Ti-4Al-4Mo-2Sn-0.5Si. Improving the mechanical behavior of these alloys enables improved component performance, which is crucial to advancing jet engine performance. As a world leader in supplying advanced alloys of titanium, nickel, cobalt, and specialty stainless steels, ATI is developing new titanium alloys with improved elevated temperature properties. These improved properties derive from precipitation of secondary intermetallics in alpha-beta titanium alloys. ATI has developed several new alpha-beta titanium alloy compositions which exhibit significantly improved elevated temperature strength and creep resistance. This paper will focus on the effects of chemistry and heat treat conditions on the microstructure and resulting elevated temperature properties of these new aerospace titanium alloys.

Download Full-text

RMI 8Al-1Mo-1V

Alloy Digest ◽

10.31399/asm.ad.ti0084 ◽

1982 ◽

Vol 31 (2) ◽

Keyword(s):

Tensile Strength ◽

Creep Resistance ◽

High Strength ◽

Heat Treating ◽

Bend Strength ◽

Beta Titanium Alloy ◽

Annealed Condition ◽

Jet Engine ◽

Beta Titanium ◽

Alpha Beta

Abstract RMI 8A1-1Mo-1V is an alpha-beta titanium alloy with a tensile strength of 135,000 psi in the mill-annealed condition. It has an excellent combination of tensile strength and creep resistance that makes it suitable for service to 1000 F. It is recommended for aircraft and jet-engine parts requiring high strength with superior creep resistance and toughness. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and bend strength as well as creep. It also includes information on high temperature performance and corrosion resistance as well as heat treating, machining, joining, and surface treatment. Filing Code: Ti-84. Producer or source: RMI Company.

Download Full-text

Fractographic Analysis of Hydrogen-Assisted Cracking in Alpha-Beta Titanium Alloys

Fractography of Modern Engineering Materials: Composites and Metals ◽

10.1520/stp25631s ◽

2008 ◽

pp. 400-400-24 ◽

Cited By ~ 4

Author(s):

DA Meyn ◽

RA Bayles

Keyword(s):

Titanium Alloys ◽

Fractographic Analysis ◽

Beta Titanium ◽

Hydrogen Assisted Cracking ◽

Alpha Beta ◽

Beta Titanium Alloys

Download Full-text

THE INFLUENCE OF MICROSTRUCTURE ON THE MECHANICAL PROPERTIES OF FORGED ALPHA/BETA TITANIUM ALLOYS

The Science, Technology and Application of Titanium ◽

10.1016/b978-0-08-006564-9.50098-1 ◽

1970 ◽

pp. 879-889 ◽

Cited By ~ 1

Author(s):

S.J. ASHTON ◽

L.H. CHAMBERS

Keyword(s):

Mechanical Properties ◽

Titanium Alloys ◽

Beta Titanium ◽

Alpha Beta ◽

Beta Titanium Alloys

Download Full-text

Mechanical Behaviour of Beta Titanium Alloys

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1016.964 ◽

2021 ◽

Vol 1016 ◽

pp. 964-970

Author(s):

Nageswara Rao ◽

Geetha Manivasagam

Keyword(s):

Heat Treatment ◽

Titanium Alloys ◽

Dynamic Properties ◽

Solution Treatment ◽

Weight Ratio ◽

High Strength ◽

Static Properties ◽

Beta Titanium Alloy ◽

Beta Titanium ◽

Beta Titanium Alloys

Beta titanium alloys have several attractive features; this has resulted in this group of alloys receiving much attention since 1980’s. Among the attributes which distinguish them for their superiority over other structural materials are (i) high strength to which they can be heat treated, resulting in high strength to weight ratio (ii) high degree of hardenability which enables heat treatment in large section sizes to high strength levels (iii) excellent hot and cold workability, making them as competitive sheet materials etc. The standard heat treatment consists of solution treatment in beta or alpha plus beta phase field followed by aging. However, certain aging treatments can render the materials in a state of little or no ductility; the designer has to be aware of this behaviour and has to keep away from such treatments while working with the materials. Such unfavourable aging treatments may adversely affect not only the static properties such as reduction in area and elongation in a tensile test, but also dynamic properties such as impact toughness. Results of fractographic studies are in line with those of mechanical testing. The authors would present the foregoing analysis, based primarily on the wide-ranging researches they carried out on beta titanium alloy Ti15-3 and to some extent data published by researchers on other grades of beta titanium alloys. An attempt is made to explain the mechanisms underlying the embrittlement reactions that take place in beta titanium alloys under non-optimal aging treatments.

Download Full-text