Titanium Ti-5Al-2.5Sn (Grade 6)

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Titanium Ti-5Al-2.5Sn (Grade 6)
Categories:	Metal; Nonferrous Metal; Titanium Alloy; Alpha/Near Alpha Titanium Alloy
Material Notes:	Characteristics: High service temperatures (480°C), Intermediate strength, Improved high temperature strength compared to unalloyed Ti, Excellent weld fabricability, Oxidation resistance, Microstructure stability, Nonheat-treatable (contains only iron impurity as a beta-stablizing element) Applications: Gas turbine engine casings and rings, Aerospace structural members, Chemical processing equipment Microstructure: Equiaxed alpha - when treated/worked below beta transus, Acicular alpha - when treated/worked above beta transus, Beta (bcc) - small amounts may be present Forms typically available: Billet, bar, rod, plate, sheet, extrusions, and wire. 1 other heat treatment of this alloy is in MatWeb.
Key Words:	UNS R54520; Ti-5-2.5
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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	320	320
Hardness, Knoop	363	363	Estimated from Rockwell C.
Hardness, Rockwell C	36	36
Hardness, Vickers	349	349	Estimated from Rockwell C.
Tensile Strength	517 MPa @Temperature 427 °C	75000 psi @Temperature 801 °F
Tensile Strength, Ultimate	861 MPa	125000 psi
Tensile Strength, Yield	827 MPa	120000 psi
Elongation at Break	15 %	15 %
Reduction of Area	>= 40 %	>= 40 %
Creep Strength	2.80 MPa @Temperature 540 °C, Time >=3.60e+6 sec	406 psi @Temperature 1000 °F, Time >=1000 hour	strain 0.1%
	23.0 MPa @Temperature 540 °C, Time >=3.60e+6 sec	3340 psi @Temperature 1000 °F, Time >=1000 hour	strain 0.5%
	83.0 MPa @Temperature 315 °C, Time >=3.60e+6 sec	12000 psi @Temperature 599 °F, Time >=1000 hour	strain 0.1%
	385 MPa @Temperature 315 °C, Time >=3.60e+6 sec	55800 psi @Temperature 599 °F, Time >=1000 hour	strain 0.5%
Rupture Strength	448 MPa @Temperature 427 °C, Time 3.60e+6 sec	65000 psi @Temperature 801 °F, Time 1000 hour
Modulus of Elasticity	110 - 125 GPa	16000 - 18100 ksi
Modulus of Rigidity	48.2 GPa	6990 ksi
Compressive Yield Strength	830 MPa	120000 psi
Notched Tensile Strength	1240 MPa	180000 psi	K_t (stress concentration factor) = 6.5
Ultimate Bearing Strength	1760 MPa	255000 psi	e/D = 2
Bearing Yield Strength	1340 MPa	194000 psi	e/D = 2
Poissons Ratio	0.31	0.31	Typical for alpha titanium alloy.
Fatigue Strength	290 MPa @# of Cycles 1.00e+7	42100 psi @# of Cycles 1.00e+7	K_t (stress concentration factor) = 2.4
	380 MPa @# of Cycles 1.00e+7	55100 psi @# of Cycles 1.00e+7	unnotched
	390 MPa @# of Cycles 100000	56600 psi @# of Cycles 100000	K_t (stress concentration factor) = 2.4
	440 MPa @# of Cycles 1.00e+6	63800 psi @# of Cycles 1.00e+6	unnotched
	530 MPa @# of Cycles 100000	76900 psi @# of Cycles 100000	Unnotched
Fracture Toughness	33.0 MPa-m½	30.0 ksi-in½	K(ISCC)
	96.0 MPa-m½	87.4 ksi-in½	K(IC)
Shear Modulus	48.0 GPa	6960 ksi
Shear Strength	520 MPa	75400 psi	Ultimate shear strength
Charpy Impact	24.0 J	17.7 ft-lb	V-notch
Bend Radius, Minimum	4.5 t @Thickness >=1.80 mm	4.5 t @Thickness >=0.0709 in

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.000160 ohm-cm	0.000160 ohm-cm
Magnetic Permeability	1.00005	1.00005	at 1.6 kA/m

Thermal Properties	Metric	English	Comments
CTE, linear	9.40 µm/m-°C @Temperature 0.000 - 100 °C	5.22 µin/in-°F @Temperature 32.0 - 212 °F
	9.50 µm/m-°C @Temperature 0.000 - 315 °C	5.28 µin/in-°F @Temperature 32.0 - 599 °F	average; unspecified heat treatment.
	9.70 µm/m-°C @Temperature 0.000 - 650 °C	5.39 µin/in-°F @Temperature 32.0 - 1200 °F	average
Specific Heat Capacity	0.530 J/g-°C @Temperature 20.0 °C	0.127 BTU/lb-°F @Temperature 68.0 °F
	0.674 J/g-°C @Temperature 315 °C	0.161 BTU/lb-°F @Temperature 599 °F
Thermal Conductivity	7.80 W/m-K @Temperature 20.0 °C	54.1 BTU-in/hr-ft²-°F @Temperature 68.0 °F
	10.9 W/m-K @Temperature 315 °C	75.6 BTU-in/hr-ft²-°F @Temperature 599 °F
Melting Point	<= 1590 °C	<= 2890 °F
Liquidus	1590 °C	2890 °F
Maximum Service Temperature, Air	480 °C	896 °F
Beta Transus	1040 - 1090 °C	1900 - 1990 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	4.0 - 6.0 %	4.0 - 6.0 %
Carbon, C	<= 0.10 %	<= 0.10 %
Hydrogen, H	<= 0.015 %	<= 0.015 %
Iron, Fe	<= 0.50 %	<= 0.50 %
Nitrogen, N	<= 0.030 %	<= 0.030 %
Other, each	<= 0.050 %	<= 0.050 %
Other, total	<= 0.30 %	<= 0.30 %
Oxygen, O	<= 0.20 %	<= 0.20 %
Tin, Sn	2.0 - 3.0 %	2.0 - 3.0 %
Titanium, Ti	89.855 - 94 %	89.855 - 94 %	As Balance; Elemental Composition per ASTM B265

References for this datasheet.

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MTA520 / 14127

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