Titanium Alloy Ti6Al-4V – Properties, Composition, Heat Treatments and Specifications

Ti6Al-4V is the most widely used of all the alpha-beta titanium alloys. It may be heat treated for high strength in welded construction at service temperatures through 600°F. Hardenability is limited and sections over about one inch may not develop full properties.

Applications

Typical Applications for the titanium alloy Ti 6Al-4V include:

  • Turbine blades, discs and rings
  • Aircraft structural components
  • Fasteners
  • Medical and dental implants
  • Hand tools
  • Sporting equipment

Composition of Ti6Al-4V

The composition range for Ti6Al-4V is provided in table 1.

Table 1. Composition of titanium alloy Ti6Al-4V.

Chemistry, %

AMS 4967

Min

Max

Aluminum

5.50

6.75

Vanadium

3.50

4.50

Carbon

-

0.08

Nitrogen

-

0.05

Oxygen

-

0.20

Hydrogen

-

0.0125

Iron

-

0.30

Yttrium

-

0.005

Others, each

-

0.10

Other, total

-

0.40

Titanium

remainder

Specifications

The various forms of Ti6Al-4V are covered by the following standards:

  • UNS R56400 W.Nr. 3.7164/5
  • AMS 4911 Sheet, strip, and plate, annealed
  • AMS 4928 Bars, wire, forgings & rings, annealed, heat treatable
  • AMS 4967 Bars, wire, forgings & rings, annealed, heat treatable
  • MIL-T-9047 Bars and reforging stock
  • MIL-T-81556 Extruded bars and shapes
  • MIL-F-83142 Forgings
  • ASTM B 265, Strip, sheet and plate Grade 5
  • ASME SB-265
  • ASTM B 348, Bar, Billet Grade 5
  • ASME SB-348
  • ASTM B 861, Seamless pipe Grade 5
  • ASME SB-861

Heat Treatments

Annealing bar and forgings for maximum ductility is done at 1275-1325°F 2 hours furnace cool. Solution treated and aged condition is:

For sheet, 1675-1725°F 5 to 25 minutes, water quench. Age 975°F 4 to 6 hours, air cool.

For bars and forgings, 1675-1725°F 1 hour, water quench. Age 975-1025°F 3 hours, air cool.

For increased fracture toughness, but lower tensile strength, precipitation treat (overage) 1150-1250°F

4 hours, air cool.

Stress-relief annealing is commonly 1000-1200°F

1/2- 4 hours, air cool.

Physical Properties of Titanium Ti6Al-4V

Density:

0.160 lb/inch3

Melting Range:

2929-3020°F

Beta Transus Nominal:

1825±25°F

Thermal Properties of Titanium Ti6Al-4V

The thermal properties of Ti6Al-4V are summarised in table 2.

Table 2. Thermal properties of titanium alloy Ti6Al-4V.

Temp

Coeffcient of Thermal Exp.

Thermal Conductivity

Modulus

°F

in/in °F x 10-6

Btu. ft/ft2.hr°F

psi x 106

STA

STA

RT

-

4.0

16.7

200

5.3

4.3

16.0

400

5.4

5.2

15.0

600

5.5

.1

14.0

Typical Mechanical Properties of Titanium Ti6Al-4V

The mechanical properties titanium alloy Ti6Al-4V, specified, AMS 4911, annealed sheet & plate are provided in table 3.

Table 3. Typical mechanical properties of Ti6Al-4V.

Size up to

Tensile Strength

0.2% Yield Strength

Elong in 2”

Inch

ksi

ksi

%

>0.025 ≤ 0.063

134

126

8

>0.063 ≤0.1874

134

126

10

>0.1874 ≤ 4.000

130

120

10

Typical Range, Room Temperature Bar Tensile Properties

Table 4. Range in properties as a function of heat treatment for Ti6Al-4V

Heat Treatment

UTS, ksi

0.2% YS, ksi

% Elong

%RA

Anneal 1300°F Air Cool

138-155

128-147

15-20

38-51

Anneal 1300°F Solution anneal 1750°F Age 1000°F

150-172

137-156

15-17

41-46

Typical Tensile Strength and Fracture Toughness

Table 5. Typical tensile strength and fracture toughness, various heat treatments for flat-rolled products (MCIC-HB-02 1985 reprint) for Ti6Al-4V

Heat Treatment

0.2% YS, ksi

Fracture Toughness kc, ksi √ inch

Annealed (Continuously)

143

178

Rolled Sheet

142 (transversea)

140 (transversea)

Beta Annealed

131

134

Beta STA 1250°Fb

128

150

Beta STA 1000°Fb

143

120

STA 1250°Fc

137

105

STA 1000°Fc

159

80

(a) Directional variations
(b) Beta heat treated followed by solution treating and overaging 1250°F, or aging 1000°F
(c) Solution treating and overaging 1250°F, or aging 1000°F

This information has been sourced, reviewed and adapted from materials provided by NeoNickel.

For more information on this source, please visit NeoNickel.

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Comments

  1. Ionel Brasoveanu Ionel Brasoveanu Romania says:

    Dear sir, making a hot bar thermode from LCD bonding with 6AL-4V, is necessary thermal treatment? thankyou.

  2. Ionel Brasoveanu Ionel Brasoveanu Romania says:

    the informations from this article are very usefull

The opinions expressed here are the views of the writer and do not necessarily reflect the views and opinions of AZoM.com.

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