TIMET TIMETAL® 679 (Ti-11Sn-5Zr-2.25Al-1Mo-0.2Si) Titanium Alloy; Air Cooled & Aged

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TIMET TIMETAL® 679 (Ti-11Sn-5Zr-2.25Al-1Mo-0.2Si) Titanium Alloy; Air Cooled & Aged
Categories:	Metal; Nonferrous Metal; Titanium Alloy; Alpha/Beta Titanium Alloy
Material Notes:	High-Temperature, High-Strength Creep Resistant Alloy Industry Specifications: USA Aerospace: AMS 4974. TIMETAL 679 has excellent tensile strength and is creep resistant up to 450°C. It is a three-phase alloy at room temperature, having an alpha + beta + compound field and a maximum processing temperature of 925°C is recommended. It is nonmagnetic. Typical heat treatment for this alloy: Solution heat treatment: 900°C for 30 min. Aging heat treatment: 500°C for 24 hrs, air cool. Data provided by TIMET.
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Physical Properties	Original Value	Comments

Density	4.84 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	811 MPa @Temperature 450 °C
	828 MPa @Temperature 400 °C
	851 MPa @Temperature 300 °C
	891 MPa @Temperature 200 °C
	954 MPa @Temperature 100 °C
	>= 1030 MPa @Temperature 20.0 °C
Tensile Strength, Yield	688 MPa @Strain 0.2 %, Temperature 450 °C
	701 MPa @Strain 0.2 %, Temperature 400 °C
	738 MPa @Strain 0.2 %, Temperature 300 °C
	819 MPa @Strain 0.2 %, Temperature 200 °C
	940 MPa @Strain 0.2 %, Temperature 100 °C
	>= 970 MPa @Strain 0.2 %, Temperature 20.0 °C
Elongation at Break	>= 8.0 % @Temperature 20.0 °C	in 5D
	17 % @Temperature 400 °C	in 5D
	18 % @Temperature 450 °C	in 5D
	18 % @Temperature 100 °C	in 5D
	18 % @Temperature 300 °C	in 5D
	19 % @Temperature 200 °C	in 5D
Reduction of Area	>= 30 % @Temperature 20.0 °C
	47 % @Temperature 100 °C
	48 % @Temperature 400 °C
	48 % @Temperature 450 °C
	49 % @Temperature 200 °C
	49 % @Temperature 300 °C
Creep Strength	193 MPa @Temperature 500 °C, Time 1.08e+6 sec	total plastic strain = 0.094%
	350 MPa @Temperature 450 °C, Time 1.08e+6 sec	total plastic strain = 0.085%
	560 MPa @Temperature 400 °C, Time 1.08e+6 sec	total plastic strain = 0.087%
Modulus of Elasticity	107 GPa	Typical
Notched Tensile Strength	>= 1440 MPa
Fatigue Strength	510 MPa @Temperature 300 °C	± Alternating Stress
	510 MPa @Temperature 400 °C	± Alternating Stress
	525 MPa @Temperature 200 °C	± Alternating Stress
	560 MPa @Temperature 100 °C	± Alternating Stress
	640 MPa @Temperature 22.0 °C	± Alternating Stress
Shear Modulus	46.0 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.000160 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	8.30 µm/m-°C @Temperature 20.0 °C
Thermal Conductivity	8.30 W/m-K
Maximum Service Temperature, Air	450 °C	Creep Resistance Maintained
Beta Transus	950 °C

Component Elements Properties	Original Value	Comments
Aluminum, Al	2.0 - 2.5 %
Hydrogen, H	<= 0.0125 %
Iron, Fe	<= 0.20 %
Molybdenum, Mo	0.80 - 1.2 %
Oxygen, O	<= 0.20 %
Silicon, Si	0.10 - 0.50 %
Tin, Sn	10.5 - 11.5 %
Titanium, Ti	77.9 - 82.6 %	Calculated as remainder
Zirconium, Zr	4.0 - 6.0 %

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NTIME679A / 200045

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