Description
The following sections will discuss in detail about grade 6 Ti-5Al-2.5Sn alloy.
Chemical Composition
The chemical composition of grade 6 Ti-5Al-2.5Sn alloy is outlined in the following table.
| Element | Content (%) |
|---|---|
| Titanium, Ti | 89.85 – 94 |
| Aluminum, Al | 4-6 |
| Tin, Sn | 2-3 |
| Iron, Fe | ≤ 0.50 |
| Oxygen, O | ≤ 0.20 |
| Carbon, C | ≤ 0.10 |
| Nitrogen, N | ≤ 0.030 |
| Hydrogen, H | ≤ 0.015 |
| Other, each | ≤ 0.050 |
| Other, total | ≤ 0.30 |
Physical Properties
The physical properties of grade 6 Ti-5Al-2.5Sn alloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Density | 4.48 g/cm3 | 0.162 lb/in3 |
| Melting point | ≤ 1590 °C | ≤ 2890 °F |
Mechanical Properties
The following table shows mechanical properties of grade 6 Ti-5Al-2.5Sn alloy.
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 517 MPa | 75000 psi |
| Yield strength | 827 MPa | 120000 psi |
| Elastic modulus | 110 – 125 GPa | 16000 – 18100 ksi |
| Shear modulus | 48 GPa | 6960 ksi |
| Elongation at break | 15% | 15% |
| Hardness, Brinell | 320 | 320 |
| Hardness, Knoop | 363 | 363 |
| Hardness, Rockwell C | 36 | 36 |
| Hardness, Vickers | 349 | 349 |
Thermal Properties
The thermal properties of grade 6 Ti-5Al-2.5Sn alloy are tabulated below.
| Properties | Metric | Imperial |
|---|---|---|
| Thermal expansion co-efficient (@0.000-100°C/32-212°F) | 9.40 µm/m°C | 5.22 µin/in°F |
| Thermal conductivity | 7.80 W/mK | 54.1 BTU in/hr.ft².°F |
Other Designations
Equivalent materials to grade 6 Ti-5Al-2.5Sn alloy are as follows:
- ASTM B265 Grade6
- ASTM B348 Grade6
- ASTM B381 Grade6
- MIL-T-9046
- MIL-T-9047
- AMS 4926
- AMS 4910
- AMS 4966
- AMS 4953
- MIL F-83142
- MIL T-81556
- MIL T-81915
Fabrication and Heat Treatment
Machinability
Grade 6 Ti-5Al-2.5Sn alloy is hard to machine but can be successfully done using slow speeds, high coolant flow, and high feed rates. Tooling should be performed using tungsten carbide designations C1-C4 or cobalt type high speed tools.
Forming
Grade 6 Ti-5Al-2.5Sn alloy can be hot or cold formed using power brake, hydropress, stretch or drop hammer methods.
Welding
Welding of grade 6 Ti-5Al-2.5Sn alloy is rated as good.
Annealing
Annealing of this material can be performed by heating to 718-843°C (1325-1550° F) for 4 h and then air cooled. In case intermediate stress relieving is required, the material has to be heated to 538-650 °C (1000-1200° F) for 1 h, and then air cooled.
Forging
Forging can be performed at 1010-1038°C (1850-1900°F) and completed at 954-1010°C (1750-1850°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 a moderately tempered austenitic stainless steel. Post-work annealing is recommended to re-attain favorable performance properties.
Applications
Grade 6 Ti-5Al-2.5Sn alloy is used in the following application areas:
- Gas turbine engine casings and rings
- Aerospace structural parts, aircraft engine and airframe.
- Chemical processing equipment
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