Grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si Alloy

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Annealing
     Forging
     Hot Working
     Cold Working
Applications

Introduction

Titanium mixed with other chemical elements such as aluminum, tin, molybdenum and zirconium produces a wide range of titanium alloys.

Grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy is an alpha-beta alloy. It is designed with high strength, intermediate creep strength, and fracture toughness. The following sections will discuss in detail about grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy.

Chemical Composition

The chemical composition of grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy is outlined in the following table.

Element Content (%)
Titanium, Ti 86
Aluminum, Al 6
Chromium, Cr 2
Tin, Sn 2
Zirconium, Zr 2
Molybdenum, Mo 2
Iron, Fe ≤ 0.25
Silicon, Si 0.25
Oxygen, O ≤ 0.14
Carbon, C ≤ 0.040
Nitrogen, N ≤ 0.030

Physical Properties

The physical properties of grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy are tabulated below.

Properties Metric Imperial
Density 4.65 g/cm3 0.168 lb/in3
Melting point ≤ 1650 °C ≤ 3000 °F

Mechanical Properties

The following table shows mechanical properties of grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy.

Properties Metric Imperial
Tensile strength 1120 MPa 162000 psi
Yield strength 1010 MPa 146000 psi
Poisson’s ratio 0.33 0.33
Elastic modulus 108 GPa 15700 ksi
Shear modulus 46.0 GPa 6670 ksi
Elongation at break 14% 14%

Thermal Properties

The thermal properties of grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@0.000-100°C/32-212°F) 9.20 µm/m°C 5.11 µin/in°F
Thermal conductivity 7.80 W/mK 54.1 BTU in/hr.ft².°F

Fabrication and Heat Treatment

Machinability

Grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy can be machined using slow speeds, right quantity of coolant flow and high feed rates. High-speed tools should be used for tooling this alloy and the recommended tool types are tungsten carbide designations C1-C4 or cobalt based.

Forming

Grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy can be hot or cold formed.

Welding

Weldabilty of grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy is rated as limited.

Annealing

For annealing grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy, the material has to be soaked at 704-815°C (1300-1500°F) for 2h, and then air cooled.

Forging

Rough forging can be performed at 899-954°C (1650-1750°F) and completed at 871-927°C (1600-1700°F).

Hot Working

Hot working enhances the overall ductility of the material.

Cold Working

Cold working features of this material is same as that of austenitic stainless steel. Post-work annealing is recommended to re-attain favorable performance properties.

Applications

Grade Ti 6Al 2Sn 2Zr 2Mo 2Cr 0.25Si alloy is chiefly used in airframe and jet engine components.

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