Electrometallurgy Today, 2018, №03



2018 №03 (04)

DOI of Article 10.15407/sem2018.03.05

2018 №03 (06)

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Electrometallurgy Today (Sovremennaya Elektrometallurgiya), 2018, #3, 32-38 pages
 

Properties of alloys on titanium aluminide γ-TiAl/α₂-Ti₃Al base at complex alloying

S.A. Firstov¹, I.D. Gornaya¹, Yu.N. Podrezov¹, A.A. Bondar¹, A.V. Sheremetjev²

¹I.N. Frantsevich Institute of Problems of Materials Science of the NAS of Ukraine.3 Krzhyzhanovsky Str., 03142, Kyiv. E-mail: dir@ipms.kiev.ua
²SE «Ivchenko-Progress». 2 Ivanov Str., 69068, Zaporozhye. E-mail: progress@ivchenko-progress.com

Presented are the results of study of effect of a complex alloying by Nb (3...4 %), Mo, Cr, Zr (up to 2 %), B, Y (up to 0.2 %) on mechanical properties of cast intermetallic γ-TiAl/α₂-Ti₃Al alloys, containing from 44.0 up to 48.5 % Al, produced by the method of vacuum arc remelting. The mechanical properties were determined at bending, uniaxial tension and compression tests. Vickers hardness and long-time hot hardness (high-temperature strength) were measured. The tests were carried out within the temperature interval of 20...800 °С. It was shown that the optimum properties during tension at 20 and 700 °С were demonstrated by the cast alloy Ti–47Al–5.5 (Nb, Cr, Mo); coefficient of elasticity was approximately 170 and 126 GPa, tensile strength was 770 and 644 MPa, ductility was 0.15 and 0.65 %, respectively. Crack resistance of this alloy is approximately 22.4 MPa∙m^1/2, long-time hot hardness at 700 °С is 2.0 GPa, that twice increases the value of hardness of high-temperature titanium alloys. 20 Ref., 5 Tabl., 1 Fig.
Key words: titanium alloys; titanium aluminides; alloying; mechanical properties; high-temperature strength
 
Received:                09.07.17
Published:               01.10.18
 
 

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