Mechanical Properties of Titanium Alloys

 

Unalloyed, commercially pure titanium has a tensile strength ranging from 275 to 590 MPa, and this strength is controlled primarily through oxygen content
and iron content. The higher the oxygen and iron content, the higher the
strength. Commcercially alloyed titanium grades can range from a tensile strength as low as 600 MPa ( such as Ti-3A1-2.5V) to a tensile strength as high as 1250 MPa ( e.g. for the high strength alloy Ti-15Mo-5Zr-3AI).

 

Commercially pure titanium is stable up to temperatures of approximately 300°C due to its specific strength and creep resistance. More complex titanium alloys exhibit high strength even at temperatures up to approximately 500°C. 

 

The fatigue strength (10^7 cycles) is roughly equivalent to 50% of the tensile
strength, and welding does not cause a significant decline in fatigue strength. Even in seawater, both commercially pure titanium and titanium alloys exhibit almost no decline in fatigue strength.


The fracture toughness of titanium alloys range from 28 to 108 MPa m^1/2
and is in negative correlation with tensile yield strength. The specific fracture toughness is dependent on microstructure, and thus fracture toughness of the various alloys is higher in Titanium alloys with acicular structures.

 

Microstructure design and mechanical properties in a near-alpha Ti–4Mo alloy
Acta Materialia 97 (2015) 291-304
Microstructure design and mechanical properties in a near-a Ti–4Mo alloy
Z. Tarzimoghadam, S. Sandlöbes, K.G. Pradeep, D. Raabe
Acta Materialia 97 (2015) 291 Ti Mo Micr[...]
PDF-Dokument [3.8 MB]
Mechanical Properties of Titanium Alloys (image from: Titanium and Titanium Alloys. Fundamentals and Applications. eds. Leyens, Peters)

 

 

 

 

Mechanical Properties of some Titanium Grades and Alloys

 

 

               Tensile strength (min)

0.2% yield strength (min)

Designation

MPa

ksi

MPa

ksi

 

Unalloyed grades

 

 

ASTM grade 1

240

35

170

25

ASTM grade 2

340

50

280

40

ASTM grade 3

450

65

380

55

ASTM grade 4

550

80

480

70

ASTM grade 7

340

50

280

40

ASTM grade 11

240

35

170

25

 

α and near-α alloys

 

 

Ti-0.3Mo-0.8Ni

480

70

380

55

Ti-5Al-2.5Sn

790

115

760

110

Ti-5Al-2.5Sn-ELI

690

100

620

90

Ti-8Al-1Mo-1V

900

130

830

120

Ti-6Al-2Sn-4Zr-2Mo

900

130

830

120

Ti-6Al-2Nb-1Ta-0.8Mo

790

115

690

100

Ti-2.25Al-11Sn-5Zr-1Mo

1000

145

900

130

Ti-5.8Al-4Sn-3.5Zr-0.7Nb-0.5Mo-0.35Si

1030

149

910

132

 

α-β alloys

 

 

Ti-6Al-4V(a)

900

130

830

120

Ti-6Al-4V-ELI(a)

830

120

760

110

Ti-6Al-6V-2Sn(a)

1030

150

970

140

Ti-8Mn(a)

860

125

760

110

Ti-7Al-4Mo(a)

1030

150

970

140

Ti-6Al-2Sn-4Zr-6Mo(b)

1170

170

1100

160

Ti-5Al-2Sn-2Zr-4Mo-4Cr(b)(c)

1125

163

1055

153

Ti-6Al-2Sn-2Zr-2Mo-2Cr(c)

1030

150

970

140

Ti-3Al-2.5V(d)

620

90

520

75

Ti-4Al-4Mo-2Sn-0.5Si

1100

160

960

139

β alloys

 

 

Ti-10V-2Fe-3Al(a)(c)

1170

170

1100

160

Ti-13V-11Cr-3Al(b)

1170

170

1100

160

Ti-8Mo-8V-2Fe-3Al(b)(c)

1170

170

1100

160

Ti-3Al-8V-6Cr-4Mo-4Zr(a)(c)

900

130

830

120

Ti-11.5Mo-6Zr-4.5Sn(a)

690

100

620

90

Ti-15V-3Cr-3Al-3Sn

1000(b)

145(b)

965(b)

140(b)

 

1241(f)

180(f)

1172(f)

170(f)

Ti-15Mo-3Al-2.7Nb-0.2Si

862

125

793

115

Mechanical Properties Titanium and Titanium Alloys 01
Mechanical Properties Titanium and Titan[...]
PDF-Dokument [204.5 KB]
Mechanical Properties Titanium and Titanium Alloys 02
Mechanical Properties Titanium and Titan[...]
PDF-Dokument [325.9 KB]

 

 

 

Mechancial Property Data on Titanium Alloys

 

Acta Mat. 2011, 59, p. 364