6Al-2Sn-4Zr-2Mo

6Al-2Sn-4Zr-2Mo

 A near-alpha alloy, primarily used for high strength and toughness, with good creep resistance up to 1000°F. Forging and machining characteristics similar to those of Ti 6Al-4V. Applications include compressor components, hot airframe skin, and engine afterburner structures. The weldability of Ti 6-2-4-2 is fair, using AMS 4952 weld wire. Several different treatments are available. 
Sheet & Strip under 0.1875″ thickness: Duplex anneal: 1650 ± 25°F), 30± 3 minutes, air cool, followed by 1450± 25°F 15± 2 minutes, air cool. 
Triplex anneal: 1650°F ½ hour, air cool, followed by 1450°F ¼ hour, air cool, 1100°F 2 hours air cool. 
Plate 0.1875 inch thickness and over: Duplex anneal: 650± 25°F 60± 5 minutes, air cool, followed by 1100±25°F 8 hours ± 15 minutes, air cool. Triplex anneal: 1650°F ½ hour, air cool, followed by 1450°F ¼, air cool, 1100°F 2 hours air cool. 
Bar and Forgings: Duplex anneal: Solution anneal 25 – 50°F below. Beta transus 1 hour, air cool or faster, 1100°F 8 hours air cool.
Chemistry

 

Al

Sn

Zr

Mo

C

N

H

O

Si

Fe

Y

Others,
Each

Others,
Total

Ti

MIN

5.5

1.8

3.6

1.8

0.06

 

 

MAX

6.5

2.2

4.4

2.2

0.05

0.05

0.015

0.12

0.1

0.25

0.005

0.1

0.3

Balance

Specifications
AMS 4919, AMS 4975, AMS 4976, AMS 4979, AMS T-9047
EN 3.71450
MIL-F-81556
MIL-F-82142, MIL-T-9046
MIL-T-9047
UNS R54620
Werkstoff 3.7145
Inventory
6Al-2Sn-4Zr-2Mo Forged Billet, 6Al-2Sn-4Zr-2Mo Plate, 6Al-2Sn-4Zr-2Mo Round Bar, 6Al-2Sn-4Zr-2Mo Sheet
Common Trade Names
6-2-4-2 Titanium, 6-2-4-2
Features
• Machinability similar to austenitic stainless steels
• Easily welded if proper precautions are taken to prevent oxygen, nitrogen and hydrogen contaminations
• Long term stability for temperatures up to 800°F
Applications
• Compressor discs, blades
• Airframe structure, skin
• Engine afterburner components
• Hush kits
Physical Properties
Density: 0.160 lb/in3
Beta Transus: 1825±25°F 
Thermal Conductivity: 4.00 Btu • hr/ft2 • hr°F
Coefficient of Thermal Expansion: 32-212°F 4.3 x10-6 in/in°F 
Modulus of Elasticity: 16.5×106 psi
Mechanical Properties
Minimum Tensile Properties, AMS 4919, Duplex Annealed

Thickness, in

0.025 ≤ 0.062

> 0.062 ≤ 1.000

> 1.000 ≤ 3.000

Tensile Strength, ksi

135,000

135,000

135,000

0.2% offset Yield Strength, ksi

125,000

125,000

125,000

Elongation, %

8

10

10

Bend Factors, Duplex Annealed, AMS 4919

Nominal Thickness, in

≤ 0.070

> 0.070 < 0.1875

Factor, 105° Bend

9

10

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