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» Titanium IMI 685

Titanex supplies this HIGH-TEMPERATURE, HIGH-STRENGTH CREEP RESISTANT ALLOY as a wire with max. 12 mm diameter. Ti-6Al-5Zr-0.5Mo-0.25Si is a near alpha alloy, combines excellent tensile strength with high temperature (968°F / 520°C) creep resistance. It is a weldable alloy that has good forging characteristics - forging temperatures above the beta transus can be used. The alloy may be joined by the processes normally used in the fabrication of titanium, including argon-arc, electron beam and friction welding. Material should be fully heat treated prior to welding, and also given a suitable post-weld treatment (exam-ple 4-8hrs at 1022°F / 550°C). The weld zone of material treated in this way will have similar structure and properties to the parent metal. IMI 685 alloy was specifically developed for the aero-engine industry.

Composition Physical Data Mechanical Data Fabrication Information

» Composition

C < 0.08 %
N2 < 0.03 %
O2 < 0.2 %
H2 < 0.01 %
Al 5.7 - 6.3 %
Zr 4.5-6 %
Mo 0.25-0.75 %
Si 0.015-0.35 %
Ti = Rem

» Physical Data

  Minimum Typical
Density g/cm3 (lb/cu.in)   4.45(0.161)
Thermal Conductivity W/mK 2.4  
*Mean Thermal Exp. Coeff. 0-100°C/°C   9.7-10.1 x 10 -6
Beta Transus °C+/-15°C(°F)   1020 (1868)

» Mechanical Data

  Minimum Typical
Tensile Strength MPa(ksi)   1030 (149)
0.2% Proof Stress MPa(ksi)   900 (131)
Elongation over 2 Inches %   10
Reduction in Area %   20
Elastic Modulus GPa(Msi)   125 (18.1)
@ 520 °C Minimum Typical
Tensile Strength MPa(ksi)   670 (97)
0.2% Proof Stress MPa(ksi)   525 (76)
Elongation over 2 Inches %   12
Reduction in Area %   36

» HEAT TREATMENT

Treatment
Temperature [°F (°C)] Time Hours Cooling Method

Solution Heat Treatment

1922°F (1050°C) / 30 minutes / Oil Quench*
Aging Heat Treatment

1022°F (550°C) /24 hours / Air Cool