Titanium TA15
GB TA15
TA15 is a near-alpha titanium structural alloy (BT20 equivalent) valued for weldability, medium-high strength and good fracture toughness in airframes.
Reference datasheet — TA15 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
TA15 tempers and conditions
TA15 is supplied in 6 conditions, soft to hard. M is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
As-welded deposit | Property set for TA15 fusion welds; joint efficiency is high but weld-zone ductility is reduced until stress relief. | 870 | 950 | 7 | 35 HRC | 1.1 % IACS |
Duplex (double) annealed | Choose for thick forgings needing improved thermal stability, creep resistance and toughness at 450–500 °C. | 880 | 970 | 13 | 32 HRC | 1.1 % IACS |
Stress relieved | Post-weld or post-machining treatment (≈550–650 °C) to remove residual stress with essentially no change in strength. | 895 | 985 | 12 | 33 HRC | 1.1 % IACS |
MDefault Thermomechanically controlled processed | Standard stocked condition for sheet, plate, bar and forgings; balanced strength, ductility and weldability. | 900 | 990 | 12 | 33 HRC | — |
Hot worked / as-forged, as-rolled | As-supplied hot-rolled bar/plate or as-forged blanks intended for further heat treatment and machining. | 915 | 1,010 | 11 | 34 HRC | 1.1 % IACS |
Solution treated and aged | Use where the highest room-temperature strength is required from TA15 sections; ductility and weld repairability drop. | 990 | 1,080 | 9 | 37 HRC | — |
Supply forms, finishes and certifications
Ways TA15 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 TA15?
TA15 is a near-alpha titanium structural alloy (BT20 equivalent) valued for weldability, medium-high strength and good fracture toughness in airframes. Default values are 900 MPa yield, 990 MPa tensile, 12% elongation, 320 HB (33 HRC) and service to 500 °C, in sheet, plate, bar, forgings and welded assemblies (M, DA, BA, STA, SR, R, AW). Weldability is high (80) while formability (32) and machinability (18) are low, so panels are hot formed or superplastically formed. Ti-6Al-4V is the nearest alternative where welded joint efficiency matters less. TA15 has a density of 4.46 g/cm³ (0.161 lb/in³), lighter than 78% of titanium grades. It melts at 1,600°C (2,912 °F). TA15 has a yield strength of 900 MPa (131 ksi) and a tensile strength of 990 MPa (144 ksi) — stronger than 82% of titanium grades. Elongation at break is 12% and the elastic modulus is 115 GPa (16.7 Msi).
What is TA15 used for?
- aircraft structural parts
- welded fuselage components
- pressure vessels
Advantages
- High service temperature — 500°C (932 °F), better than 94% of titanium grades
- High strength — 900 MPa (131 ksi), better than 82% of titanium grades
Limitations
- Limited ductility — 12%, worse than 78% of titanium grades
TA15 properties
Typical room-temperature values for TA15-M; bars are the position among titanium grades.
Physical3
TA15 has a density of 4.46 g/cm³ (0.161 lb/in³), lighter than 78% of titanium grades. It melts at 1,600°C (2,912 °F).
Mechanical16
TA15 has a yield strength of 900 MPa (131 ksi) and a tensile strength of 990 MPa (144 ksi) — stronger than 82% of titanium grades. Elongation at break is 12% and the elastic modulus is 115 GPa (16.7 Msi).
Thermal6
TA15 is rated for continuous service to 500°C (932 °F). It conducts heat at 7.5 W/m·K (4.33 BTU/hr·ft·°F), worse than 65% of titanium grades. Thermal expansion is 8.6 µm/m·K (4.78 µin/in·°F).
Electrical3
TA15 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 TA15 takes about 650 MJ of energy and emits 42 kg of CO₂ — less than 75% of titanium grades. Typical recycled content is 25%.
Manufacturability7
TA15's machinability is poor (18/100, worse than 83% of titanium grades); weldability very good (80/100); formability poor (32/100).
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. TA15 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with TA15
Is TA15 easy to machine?
Machine like Ti-6Al-4V but slightly harder: rigid setup, sharp uncoated-carbide or PVD-coated tools, vc ≈ 25–45 m/min, high-pressure flood coolant, avoid dwell and light rubbing cuts to prevent work hardening and fire risk from fine chips.
Can TA15 be welded?
Very good weldability by GTAW, plasma and electron-beam with full inert (Ar/He) shielding or vacuum, matching TA15 filler, clean/degreased edges, low interpass temperature and 550–650 °C post-weld stress relief.
Can TA15 be formed, bent or molded?
Cold formability is limited (bend radii ≥4–5 t); hot forming at 750–900 °C or superplastic forming/diffusion bonding at ~900–930 °C is the normal route for panels and complex frames.
TA15 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 |
|---|---|---|
| Alprimary α stabiliser | 5.5 – 7 | 6.5 |
| Mo | 0.5 – 2 | 1.2 |
| V | 0.8 – 2.5 | 1.5 |
| Zrsolid-solution strengthener | 1.5 – 2.5 | 2 |
| Feimpurity | ≤ 0.25 | |
| Siimpurity | ≤ 0.15 | |
| Cimpurity | ≤ 0.1 | |
| Oimpurity | ≤ 0.15 | |
| Nimpurity | ≤ 0.05 | |
| Himpurity | ≤ 0.02 | |
| Ti | balance |
What surface finishes work on TA15?
Chemically mill or pickle in HNO₃/HF to remove alpha-case after hot work; anodise (colour or hard/MAO) or apply solid-film lubricant for galling control; polish readily to a satin-bright surface.
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
Equivalent designations
Standards and trade names that resolve to Titanium TA15 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- Also called
- Ti-6211M
How much does TA15 cost?
TA15 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.
TA15 — frequently asked
What is TA15 used for?
TA15 is typically used for aircraft structural parts, welded fuselage components and pressure vessels. In short: weldable near-alpha airframe alloy; 500 °C structural capability; SPF/DB panel grade.
What is the yield strength of TA15?
TA15 has a typical yield strength of 900 MPa (131 ksi) and a tensile strength of 990 MPa (144 ksi) — stronger than 82% of titanium grades. Strength varies by condition: see the 6 listed tempers.
Is TA15 easy to machine?
Not especially — machinability is rated poor (18/100, worse than 83% of titanium grades). Machine like Ti-6Al-4V but slightly harder: rigid setup, sharp uncoated-carbide or PVD-coated tools, vc ≈ 25–45 m/min, high-pressure flood coolant, avoid dwell and light rubbing cuts to prevent work hardening and fire risk from fine chips.
Can TA15 be welded?
Yes — weldability is rated very good (80/100). Very good weldability by GTAW, plasma and electron-beam with full inert (Ar/He) shielding or vacuum, matching TA15 filler, clean/degreased edges, low interpass temperature and 550–650 °C post-weld stress relief.
What surface finishes work on TA15?
Chemically mill or pickle in HNO₃/HF to remove alpha-case after hot work; anodise (colour or hard/MAO) or apply solid-film lubricant for galling control; polish readily to a satin-bright surface.
Can TA15 be formed, bent or molded?
Cold formability is limited (bend radii ≥4–5 t); hot forming at 750–900 °C or superplastic forming/diffusion bonding at ~900–930 °C is the normal route for panels and complex frames.
What is the maximum service temperature of TA15?
TA15 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 TA15-M and TA15-STA?
M is the default condition — standard stocked condition for sheet, plate, bar and forgings; balanced strength, ductility and weldability. STA: use where the highest room-temperature strength is required from TA15 sections; ductility and weld repairability drop. Yield strength is 900 MPa in M versus 990 MPa in STA.
How much does TA15 cost?
TA15 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 / Materials Properties Handbook: Titanium Alloys — ASM International (1994)
- TA15 (Ti-6.5Al-2Zr-1Mo-1V) / (2023)
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.