Titanium TA15-DA (Duplex (double) annealed)
Heat-treated state
GB TA15
Choose for thick forgings needing improved thermal stability, creep resistance and toughness at 450–500 °C.
Values for the DA condition
Other TA15 tempers and conditions
TA15 is listed in 6 conditions; see the grade overview at TA15.
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 |
DAThis page 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 | — |
What is TA15-DA?
TA15-DA is TA15 heat treated to DA — choose for thick forgings needing improved thermal stability, creep resistance and toughness at 450–500 °C. TA15-DA has a yield strength of 880 MPa (128 ksi) and a tensile strength of 970 MPa (141 ksi) — stronger than 78% of titanium grades. Elongation at break is 13% and the elastic modulus is 114 GPa (16.5 Msi). TA15-DA 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). M is the default condition FabDigit quotes; DA is available on request or by drawing note.
Advantages
- High service temperature — 520°C (968 °F), better than 97% of titanium grades
- Tough — resists crack growth — 80 MPa·√m (72.8 ksi·√in), better than 81% of titanium grades
- High strength — 880 MPa (128 ksi), better than 78% of titanium grades
TA15-DA properties
Typical room-temperature values for TA15-DA; 22 are specific to this condition. Other listed values are TA15 reference data and may not represent this condition. Bars are the position among titanium grades.
Physical3
TA15-DA 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-DA has a yield strength of 880 MPa (128 ksi) and a tensile strength of 970 MPa (141 ksi) — stronger than 78% of titanium grades. Elongation at break is 13% and the elastic modulus is 114 GPa (16.5 Msi).
Thermal6
TA15-DA is rated for continuous service to 520°C (968 °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-DA 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-DA 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-DA's machinability is poor (19/100, worse than 78% of titanium grades); weldability very good (82/100); formability poor (34/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with TA15-DA
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.
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.
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 | — |
TA15-DA — frequently asked
What is TA15-DA used for?
TA15-DA 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-DA?
TA15-DA has a typical yield strength of 880 MPa (128 ksi) and a tensile strength of 970 MPa (141 ksi) — stronger than 78% of titanium grades. Strength varies by condition: see the 6 listed tempers.
Is TA15-DA easy to machine?
Not especially — machinability is rated poor (19/100, worse than 78% 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-DA be welded?
Yes — weldability is rated very good (82/100). 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-DA?
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-DA 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-DA?
TA15-DA is rated for continuous use to about 520°C (968 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.