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» Titanium IMI 829

Titanex supplies this WELDABLE, HIGH STRENGTH, HIGH TEMPERATURE, CREEP RESISTANT ALLOY as a wire with max. 12 mm diameter. Ti-5.5Al-3.5Sn-3Zr-1Nb-0.25Mo-0.3Si is a weldable, high strength, high temperature (1004°F / 540°C) creep resistant alloy specifically developed for gas turbine engine components. This IMI 829 is a near alpha alloy but includes both alpha and beta stabilizer alloying elements. IMI 829 can be worked in the beta phase field, but to avoid the formation of an unacceptably large beta grain size, a process route involving alternate beta and alpha + beta working is recommended. One way to achieve this is to heat into the beta field but allow the temperature to drop into the alpha + beta field during forging.

Composition Physical Data Mechanical Data Fabrication Information

» Composition

C < 0.08 %
N2 < 0.03 %
O2 < 0.09-0.15 %
H2 < 0.006 %
Al 5.2 - 5.7 %
Zn 3-4 %
Zr 2.5-3.5 %
Nb 0.7-1.3 %
Mo 0.2-0.35 %
Si 0.2-0.5 %
Ti = Rem

» Physical Data

  Minimum Typical
Density g/cm3 (lb/cu.in)   4.54(0.164)
Thermal Conductivity W/mK 6.9  
*Mean Thermal Exp. Coeff. 0-100°C/°C   9.45-9.98 x 10 -6
Beta Transus °C+/-15°C(°F)   1015 (1859)

» Mechanical Data

  Minimum Typical
Tensile Strength MPa(ksi)   930 (135)
0.2% Proof Stress MPa(ksi)   820 (119)
Elongation over 2 Inches %   9
Reduction in Area %   15
Elastic Modulus GPa(Msi)   120 (17)
@ 540 °C Minimum Typical
Tensile Strength MPa(ksi)   570 (83)
0.2% Proof Stress MPa(ksi)   440 (64)
Elongation over 2 Inches %   9
Reduction in Area %   25

» HEAT TREATMENT

Treatment
Temperature [°F (°C)] Time Hours Cooling Method
Solution Heat Treatment
1922°F (1050°C) / 30 minutes / Air Cool or Oil Quench*
Aging Heat Treatment
1157°F (625°C) / 24 hours / Air Cool