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	Original Value	Comments

Density	4.48 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	351	Estimated from Rockwell C.
Hardness, Knoop	382	Estimated from Rockwell C.
Hardness, Rockwell C	38
Hardness, Vickers	367	Estimated from Rockwell C.
Tensile Strength, Ultimate	1170 MPa
Tensile Strength, Yield	1035 MPa
Elongation at Break	10 %
Reduction of Area	15 %
Modulus of Elasticity	113.8 GPa
Modulus of Rigidity	44.8 GPa
Compressive Yield Strength	1070 MPa
Notched Tensile Strength	1380 MPa	K_t (stress concentration factor) = 3.5
Ultimate Bearing Strength	2280 MPa	e/D = 2
Bearing Yield Strength	1690 MPa	e/D = 2
Poissons Ratio	0.32
Fatigue Strength	240 MPa @# of Cycles 1.00e+7	K_t (stress concentration factor) = 4.0
	590 MPa @# of Cycles 1.00e+7	unnotched
Fracture Toughness	39.0 MPa-m½	K(IC)
Shear Modulus	44.0 GPa
Shear Strength	690 MPa	Ultimate shear strength
Charpy Impact	18.0 J	V-notch
Impact Test	14.0 ft-lb @Temperature 93.0 °C	Heat treatment not specified
	20.0 ft-lb @Temperature 200 °C	Heat treatment not specified
	29.0 ft-lb @Temperature 325 °C	Heat treatment not specified
	35.0 ft-lb @Temperature 540 °C	Heat treatment not specified

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.000170 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	9.00 µm/m-°C @Temperature 20.0 - 100 °C
	9.40 µm/m-°C @Temperature 20.0 - 325 °C	average
	10.4 µm/m-°C @Temperature 20.0 - 615 °C	average
Specific Heat Capacity	0.515 J/g-°C
Thermal Conductivity	6.10 W/m-K
	10.4 W/m-K @Temperature 315 °C
	12.1 W/m-K @Temperature 427 °C
	13.8 W/m-K @Temperature 540 °C
Melting Point	<= 1650 °C
Liquidus	1650 °C
Maximum Service Temperature, Air	480 °C
Beta Transus	1005 °C

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

References for this datasheet.

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MTP741 / 14247

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