Ti-25Al-17Nb-1Mo Titanium Aluminide

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Ti-25Al-17Nb-1Mo Titanium Aluminide
Categories:	Metal; Intermetallic; Nonferrous Metal; Titanium Alloy
Material Notes:	Titanium Aluminide Ti₃Al based alloy. Ti-25Al-17Nb-1Mo refers to the atomic percentage composition. The niobium addition of over > 15 atom%, and therefore formation of the O phase, improves toughness versus Ti3Al and lower Nb compositions, while the molybdenum addition improves the elevated temperature strength. Intermetallic aluminides have good mechanical properties and stability to be used in high temperature environments. A thin protective Al2O3 coating forms to provide oxidative stability.
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Mechanical Properties	Metric	English	Comments

Tensile Strength, Ultimate	1133 MPa	164300 psi	Fine Widmanstätten microstructure
Tensile Strength, Yield	989 MPa	143000 psi	Fine Widmanstätten microstructure
Elongation at Break	3.4 %	3.4 %	Fine Widmanstätten microstructure
Creep Strength	380 MPa @Temperature 650 °C, Time 1.71e+6 sec	55100 psi @Temperature 1200 °F, Time 476 hour	Fine Widmanstätten microstructure; Creep Rupture
Fracture Toughness	20.9 MPa-m½	19.0 ksi-in½	K_IC; Fine Widmanstätten microstructure

Component Elements Properties	Metric	English	Comments
Aluminum, Al	13.3 %	13.3 %	by weight
Molybdenum, Mo	1.9 %	1.9 %	by weight
Niobium, Nb (Columbium, Cb)	31.1 %	31.1 %	by weight
Titanium, Ti	53.7 %	53.7 %	by weight

References for this datasheet.

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MIAL029 / 143026

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