Titanium IMI 685 (Ti-6Al-5Zr-0.5Mo-0.25Si)

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Titanium IMI 685 (Ti-6Al-5Zr-0.5Mo-0.25Si)
Categories:	Metal; Nonferrous Metal; Titanium Alloy; Alpha/Near Alpha Titanium Alloy
Material Notes:	Heat treatment: Beta heat treated at 1050 °C, Oil Quenched, + Aged 24h at 550 °C Characteristics: Near-alpha alloy. Good creep strength, good weldability. Applications: Aerospace - engine components
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Physical Properties	Metric	English	Comments

Density	4.45 g/cc	0.161 lb/in³

Mechanical Properties	Metric	English	Comments
Tensile Strength	882 - 917 MPa	128000 - 133000 psi
Tensile Strength, Yield	758 - 815 MPa	110000 - 118000 psi	0.2% offset
Elongation at Break	6.0 - 11 %	6.0 - 11 %
Reduction of Area	15 - 22 %	15 - 22 %
Tensile Modulus	90.0 GPa @Temperature 550 °C	13100 ksi @Temperature 1020 °F	dynamic
	115 GPa @Temperature 200 °C	16700 ksi @Temperature 392 °F	dynamic
	125 GPa @Temperature 23.0 °C	18100 ksi @Temperature 73.4 °F	dynamic
Charpy Impact	43.0 J	31.7 ft-lb

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.000168 ohm-cm	0.000168 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	9.50 µm/m-°C @Temperature 20.0 - 315 °C	5.28 µin/in-°F @Temperature 68.0 - 599 °F
	9.80 µm/m-°C @Temperature 20.0 - 100 °C	5.44 µin/in-°F @Temperature 68.0 - 212 °F
	10.1 µm/m-°C @Temperature 20.0 - 540 °C	5.61 µin/in-°F @Temperature 68.0 - 1000 °F
Thermal Conductivity	4.20 W/m-K	29.1 BTU-in/hr-ft²-°F
Beta Transus	1020 °C	1870 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	6.0 %	6.0 %
Carbon, C	<= 0.080 %	<= 0.080 %
Hydrogen, H	<= 0.010 %	<= 0.010 %
Iron, Fe	<= 0.050 %	<= 0.050 %
Molybdenum, Mo	0.50 %	0.50 %
Nitrogen, N	<= 0.030 %	<= 0.030 %
Oxygen, O	<= 0.020 %	<= 0.020 %
Silicon, Si	0.25 %	0.25 %
Titanium, Ti	88 %	88 %
Zirconium, Zr	5.0 %	5.0 %

References for this datasheet.

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MTA685 / 142957

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