Titanium TC11
GB TC11
TC11 is a high-temperature alpha-beta titanium alloy for rotating aeroengine hardware, supplied annealed (M), duplex annealed, STA, beta annealed or as-forged.
Reference datasheet — TC11 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the M condition
TC11 tempers and conditions
TC11 is supplied in 4 conditions, soft to hard. M is the default FabDigit quotes; the values on this page are for it.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot worked / as-forged | Take hot-worked or as-forged stock as intermediate billet for later forging or heat treatment; properties scatter and this state is normally not used for finished parts. | 930 | 1,050 | 12 | 33 HRC | 1.1 % IACS |
MDefault Thermomechanically controlled processed | Most common bar and forging supply state, α+β annealed at 950 °C for 1–2 h AC plus 530 °C for 6 h AC, giving the best balance of 960 MPa yield, 13% elongation and structural stability. | 960 | 1,080 | 13 | 34 HRC | — |
Duplex annealed | Choose isothermal forging with duplex annealing for disc forgings: it refines and homogenizes the bimodal structure for better thermal stability and low-cycle fatigue life at 980 MPa yield. | 980 | 1,100 | 14 | 35 HRC | 1.1 % IACS |
Solution treated and aged | Pick solution treatment near 950 °C with oil or water quench and ageing at 500–530 °C for small and medium sections needing 1060 MPa yield; ductility and fracture toughness fall. | 1,060 | 1,180 | 10 | 38 HRC | — |
Supply forms, finishes and certifications
Ways TC11 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
BA | Beta annealed | Surface finish |
What is TC11?
TC11 is a high-temperature alpha-beta titanium alloy for rotating aeroengine hardware, supplied annealed (M), duplex annealed, STA, beta annealed or as-forged. It is the strongest grade in this group at about 960 MPa yield, 1080 MPa tensile, 13% elongation and 330 HB (34 HRC), and it retains useful properties to roughly 500 °C, above the Ti-6Al-4V ceiling, which is why it is used for compressor disks and blades. Machinability is very poor (score 15), cold forming is effectively not viable, and supply is limited to forging stock and bar; Ti-6Al-4V is the alternative below 350 °C. TC11 has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,600°C (2,912 °F). TC11 has a yield strength of 960 MPa (139 ksi) and a tensile strength of 1,080 MPa (157 ksi) — stronger than 90% of titanium grades. Elongation at break is 13% and the elastic modulus is 118 GPa (17.1 Msi).
What is TC11 used for?
- aeroengine compressor disks
- compressor blades
- high-temperature fasteners
Advantages
- Stiff — 118 GPa (17.1 Msi), better than 96% of titanium grades
- High service temperature — 500°C (932 °F), better than 94% of titanium grades
- High strength — 960 MPa (139 ksi), better than 90% of titanium grades
Limitations
- Low fracture toughness — 52 MPa·√m (47.3 ksi·√in), worse than 93% of titanium grades
- Limited formability — 15/100, worse than 93% of titanium grades
- Difficult to weld — 45/100, worse than 92% of titanium grades
TC11 properties
Typical room-temperature values for TC11-M; bars are the position among titanium grades.
Physical3
TC11 has a density of 4.48 g/cm³ (0.162 lb/in³), lighter than 71% of titanium grades. It melts at 1,600°C (2,912 °F).
Mechanical16
TC11 has a yield strength of 960 MPa (139 ksi) and a tensile strength of 1,080 MPa (157 ksi) — stronger than 90% of titanium grades. Elongation at break is 13% and the elastic modulus is 118 GPa (17.1 Msi).
Thermal6
TC11 is rated for continuous service to 500°C (932 °F). It conducts heat at 7.9 W/m·K (4.56 BTU/hr·ft·°F), better than 50% of titanium grades. Thermal expansion is 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
TC11 conducts electricity at 1.1 % IACS, worse than 67% of titanium grades.
Chemical & Environmental3
Corrosion resistance is excellent (88/100), worse than 77% of titanium grades.
Sustainability4
Producing a kilogram of TC11 takes about 650 MJ of energy and emits 42 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 25%.
Manufacturability8
TC11's machinability is poor (15/100, worse than 97% of titanium grades); weldability fair (45/100); formability poor (15/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the titanium family
Yield strength against density for every titanium grade FabDigit runs. TC11 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with TC11
Is TC11 easy to machine?
Machinability is poor: use low cutting speed with heavy feed, rigid clamping and sharp carbide or solid tooling with high coolant flow. Avoid tool deflection and the surface damage caused by work hardening and alpha-layer formation.
Can TC11 be welded?
GTAW under vacuum or inert-gas shielding, electron-beam welding and friction welding are all usable, with strict gas protection throughout. Post-weld stress relief at 530–600 °C or a full anneal is needed to restore toughness.
Can TC11 be formed, bent or molded?
Cold formability is very low; almost all parts are isothermally or near-isothermally forged at 900–980 °C, below the beta transus. Control the cooling rate after forging to avoid non-uniform microstructure.
TC11 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Alalpha stabilizer / solid-solution strengthening | 5.8 – 7 | 6.5 |
| Mobeta-stabilizing element | 2.8 – 3.8 | 3.5 |
| Zrneutral strengthener | 0.8 – 2 | 1.5 |
| Siincreases creep resistance | 0.2 – 0.35 | 0.28 |
| Feimpurity | ≤ 0.25 | |
| Cimpurity | ≤ 0.1 | |
| Nimpurity | ≤ 0.05 | |
| Oimpurity | ≤ 0.15 | |
| Himpurity | ≤ 0.01 | |
| Ti | balance |
What surface finishes work on TC11?
Pickle in HNO₃/HF to remove scale and alpha case, then shot peen for fatigue strength. Color anodizing or anti-galling treatments can be applied; plating for corrosion protection is generally not needed.
Surface treatments FabDigit runs on titanium parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Thermal Spray
How much does TC11 cost?
TC11 is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
TC11 — frequently asked
What is TC11 used for?
TC11 is typically used for aeroengine compressor disks, compressor blades and high-temperature fasteners. In short: 500 °C alpha-beta titanium; highest strength in family; forging-route alloy.
What is the yield strength of TC11?
TC11 has a typical yield strength of 960 MPa (139 ksi) and a tensile strength of 1,080 MPa (157 ksi) — stronger than 90% of titanium grades. Strength varies by condition: see the 4 listed tempers.
Is TC11 easy to machine?
Not especially — machinability is rated poor (15/100, worse than 97% of titanium grades). Machinability is poor: use low cutting speed with heavy feed, rigid clamping and sharp carbide or solid tooling with high coolant flow. Avoid tool deflection and the surface damage caused by work hardening and alpha-layer formation.
Can TC11 be welded?
With care — weldability is rated fair (45/100). GTAW under vacuum or inert-gas shielding, electron-beam welding and friction welding are all usable, with strict gas protection throughout. Post-weld stress relief at 530–600 °C or a full anneal is needed to restore toughness.
What surface finishes work on TC11?
Pickle in HNO₃/HF to remove scale and alpha case, then shot peen for fatigue strength. Color anodizing or anti-galling treatments can be applied; plating for corrosion protection is generally not needed.
Can TC11 be formed, bent or molded?
Cold formability is very low; almost all parts are isothermally or near-isothermally forged at 900–980 °C, below the beta transus. Control the cooling rate after forging to avoid non-uniform microstructure.
What is the maximum service temperature of TC11?
TC11 is rated for continuous use to about 500°C (932 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between TC11-M and TC11-STA?
M is the default condition — most common bar and forging supply state, α+β annealed at 950 °C for 1–2 h AC plus 530 °C for 6 h AC, giving the best balance of 960 MPa yield, 13% elongation and structural stability. STA: pick solution treatment near 950 °C with oil or water quench and ageing at 500–530 °C for small and medium sections needing 1060 MPa yield; ductility and fracture toughness fall. Yield strength is 960 MPa in M versus 1,060 MPa in STA.
How much does TC11 cost?
TC11 is a high-cost titanium ($$$$), pricier than about 78% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys — ASM International (1990)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.