Titanium IMI 679 (Ti-11Sn-5Zr-2.25Al-1Mo-0.25Si), Oil-Quenched and Aged

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Titanium IMI 679 (Ti-11Sn-5Zr-2.25Al-1Mo-0.25Si), Oil-Quenched and Aged
Categories:	Metal; Nonferrous Metal; Titanium Alloy; Alpha/Near Alpha Titanium Alloy
Material Notes:	Alpha Prime Transus 880ºC. Tensile Properties below after oil quench/aged heat treatment: 900°C/OQ, 500°C/24hr/AC. Characteristics: High temperature creep strength, high stability, high short interval strength Applications: Aerospace, jet engine blades, wheels, large bulkhead forgings
Key Words:	Ti11Sn5Zr2.25Al1Mo0.25Si
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Physical Properties	Metric	English	Comments

Density	4.84 g/cc	0.175 lb/in³

Mechanical Properties	Metric	English	Comments
Tensile Strength, Ultimate	1110 MPa	161000 psi
Tensile Strength, Yield	970 MPa	141000 psi
Elongation at Break	8.0 %	8.0 %
Reduction of Area	25 %	25 %
Modulus of Elasticity	115 GPa	16700 ksi	Typical value for an alpha titanium alloy
Poissons Ratio	0.31	0.31	Typical for alpha titanium alloy.
Fatigue Strength	110 MPa @# of Cycles 1.00e+7	16000 psi @# of Cycles 1.00e+7	K_t = 3.0; R = -1.0 (air-cooled and aged sample)
	200 MPa @# of Cycles 50000	29000 psi @# of Cycles 50000	K_t = 3.0; R = -1.0 (air-cooled and aged sample)
	390 MPa @# of Cycles 1.00e+7	56600 psi @# of Cycles 1.00e+7	(air-cooled and aged sample)
	590 MPa @# of Cycles 50000	85600 psi @# of Cycles 50000	(air-cooled and aged sample)
Shear Modulus	43.9 GPa	6370 ksi	Calculated from typical values.

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.000160 ohm-cm	0.000160 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	8.60 µm/m-°C @Temperature 20.0 °C	4.78 µin/in-°F @Temperature 68.0 °F
	9.30 µm/m-°C @Temperature 250 °C	5.17 µin/in-°F @Temperature 482 °F
	10.0 µm/m-°C @Temperature 500 °C	5.56 µin/in-°F @Temperature 932 °F
Specific Heat Capacity	0.500 J/g-°C	0.120 BTU/lb-°F
Thermal Conductivity	8.30 W/m-K	57.6 BTU-in/hr-ft²-°F
Maximum Service Temperature, Air	450 °C	842 °F
Beta Transus	950 °C	1740 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	2.25 %	2.25 %
Carbon, C	<= 0.40 %	<= 0.40 %
Hydrogen, H	<= 0.0080 %	<= 0.0080 %
Iron, Fe	<= 0.12 %	<= 0.12 %
Molybdenum, Mo	1.0 %	1.0 %
Nitrogen, N	<= 0.40 %	<= 0.40 %
Oxygen, O	<= 0.15 %	<= 0.15 %
Silicon, Si	0.25 %	0.25 %
Tin, Sn	11 %	11 %
Titanium, Ti	81 %	81 %
Zirconium, Zr	5.0 %	5.0 %

References for this datasheet.

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