Titanium Ti-7Al-4Mo, STA

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Titanium Ti-7Al-4Mo, STA
Categories:	Metal; Nonferrous Metal; Titanium Alloy; Alpha/Beta Titanium Alloy
Material Notes:	Alpha-Beta Alloy, high strength, good creep resistance. Applications: Aerospace, jet engine disks, compressor blades and spacers, sonic horns 1 other heat treatment of this alloy is in MatWeb.
Key Words:	UNS R56740
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Physical Properties	Metric	English	Comments

Density	4.48 g/cc	0.162 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	351	351	Estimated from Rockwell C.
Hardness, Knoop	382	382	Estimated from Rockwell C.
Hardness, Rockwell C	38	38
Hardness, Vickers	367	367	Estimated from Rockwell C.
Tensile Strength, Ultimate	1170 MPa	170000 psi
Tensile Strength, Yield	1035 MPa	150100 psi
Elongation at Break	10 %	10 %
Reduction of Area	15 %	15 %
Modulus of Elasticity	113.8 GPa	16510 ksi
Modulus of Rigidity	44.8 GPa	6500 ksi
Compressive Yield Strength	1070 MPa	155000 psi
Notched Tensile Strength	1380 MPa	200000 psi	K_t (stress concentration factor) = 3.5
Ultimate Bearing Strength	2280 MPa	331000 psi	e/D = 2
Bearing Yield Strength	1690 MPa	245000 psi	e/D = 2
Poissons Ratio	0.32	0.32
Fatigue Strength	240 MPa @# of Cycles 1.00e+7	34800 psi @# of Cycles 1.00e+7	K_t (stress concentration factor) = 4.0
	590 MPa @# of Cycles 1.00e+7	85600 psi @# of Cycles 1.00e+7	unnotched
Fracture Toughness	39.0 MPa-m½	35.5 ksi-in½	K(IC)
Shear Modulus	44.0 GPa	6380 ksi
Shear Strength	690 MPa	100000 psi	Ultimate shear strength
Charpy Impact	18.0 J	13.3 ft-lb	V-notch
Impact Test	19.0 J @Temperature 93.0 °C	14.0 ft-lb @Temperature 199 °F	Heat treatment not specified
	27.1 J @Temperature 200 °C	20.0 ft-lb @Temperature 392 °F	Heat treatment not specified
	39.3 J @Temperature 325 °C	29.0 ft-lb @Temperature 617 °F	Heat treatment not specified
	47.5 J @Temperature 540 °C	35.0 ft-lb @Temperature 1000 °F	Heat treatment not specified

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.000170 ohm-cm	0.000170 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	9.00 µm/m-°C @Temperature 20.0 - 100 °C	5.00 µin/in-°F @Temperature 68.0 - 212 °F
	9.40 µm/m-°C @Temperature 20.0 - 325 °C	5.22 µin/in-°F @Temperature 68.0 - 617 °F	average
	10.4 µm/m-°C @Temperature 20.0 - 615 °C	5.78 µin/in-°F @Temperature 68.0 - 1140 °F	average
Specific Heat Capacity	0.515 J/g-°C	0.123 BTU/lb-°F
Thermal Conductivity	6.10 W/m-K	42.3 BTU-in/hr-ft²-°F
	10.4 W/m-K @Temperature 315 °C	72.2 BTU-in/hr-ft²-°F @Temperature 599 °F
	12.1 W/m-K @Temperature 427 °C	84.0 BTU-in/hr-ft²-°F @Temperature 801 °F
	13.8 W/m-K @Temperature 540 °C	95.8 BTU-in/hr-ft²-°F @Temperature 1000 °F
Melting Point	<= 1650 °C	<= 3000 °F
Liquidus	1650 °C	3000 °F
Maximum Service Temperature, Air	480 °C	896 °F
Beta Transus	1005 °C	1841 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	7.0 %	7.0 %
Carbon, C	<= 0.10 %	<= 0.10 %
Hydrogen, H	<= 0.013 %	<= 0.013 %
Iron, Fe	<= 0.30 %	<= 0.30 %
Molybdenum, Mo	4.0 %	4.0 %
Nitrogen, N	<= 0.050 %	<= 0.050 %
Oxygen, O	<= 0.20 %	<= 0.20 %
Titanium, Ti	89 %	89 %

References for this datasheet.

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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MTP741 / 14247

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