AMS 4911 - Ti-6Al-4V Titanium Sheet, Strip & Plate (Annealed)
What is AMS 4911?
AMS 4911 is the SAE International aerospace material specification for Ti-6Al-4V (Grade 5) titanium alloy in the form of sheet, strip, and plate, supplied in the annealed condition.
Sheet is defined as material up to and including 0.1874 inches thick; plate is 0.1875 inches to 6.50 inches thick.
Ti-6Al-4V per AMS 4911 achieves a minimum tensile strength of 130,000 psi (896 MPa) and is the most widely specified titanium sheet and plate product in aerospace airframe structural applications.
The alloy is identified as UNS R56400 and is commonly designated Grade 5 titanium.
Available Forms and Typical Stocked Sizes
AMS 4911 covers two distinct product forms with specific thickness ranges
Thickness: up to and including 0.1874 inches
Thickness: 0.1875 inches to 6.500 inches
Fighter Jet Metals stocks and supplies AMS 4911 sheet, strip, and plate in standard and custom-cut sizes with same-day quote response. Plate saw cutting and shearing services are available in-house.
Applications of AMS 4911 Ti-6Al-4V Titanium Sheet and Plate
Airframe Structural Applications
- Wing spars and ribs (Boeing, Airbus, Lockheed programs)
- Fuselage structural frames and bulkheads
- Pressure bulkheads and floor beams
- Skin panels and fairings (where titanium replaces steel for weight savings)
- Attachment brackets and fittings machined from plate
- Door surrounds and window frames in pressurized sections
Engine Nacelle and Thrust Reverser
- Orthopedic implants (hip, knee, spine)
- Dental implant components and abutments
- Surgical instruments and tools
- Prosthetic devices (ELI grade AMS 4930 preferred for implants)
Rotorcraft (Helicopter) Applications
- Rotor head components cut from thick plate
- Airframe structural skins
- Floor panels in military rotorcraft
Defense and Military
- Armor backing structures
- Military aircraft structural panels
- Missile body skins and structural components
Space Applications
- Launch vehicle structural skins
- Payload attach fittings machined from plate
- Propellant tank skins (cryogenic service)
Medical (ISO 5832-3 crossover)
- Orthopedic implant blanks cut from plate (where ELI grade is not required)
- Surgical instrument blanks
Chemical Composition - AMS 4911
The chemical composition of AMS 4911 Ti-6Al-4V is identical to the bar and forging specification AMS 4928 – same alloy, different product forms:
| Element | Symbol | Minimum % | Maximum % |
|---|---|---|---|
| Aluminum | Al | 5.50 | 6.75 |
| Vanadium | V | 3.50 | 4.50 |
| Iron | Fe | - | 0.30 |
| Oxygen | O | - | 0.20 |
| Carbon | C | - | 0.08 |
| Nitrogen | N | - | 0.05 |
| Hydrogen | H | - | 0.0125 |
| Yttrium | Y | - | 0.005 |
| Other (each) | - | - | 0.10 |
| Other (total) | - | - | 0.40 |
| Titanium | Ti | Balance | - |
Aluminum stabilizes the alpha phase and increases strength at elevated temperatures. Vanadium stabilizes the beta phase and improves room-temperature ductility.
The tight control on oxygen is critical for sheet – oxygen content directly affects ductility in formed sheet components.
Mechanical Properties - AMS 4911
AMS 4911 mechanical property requirements for Ti-6Al-4V in the annealed condition:
| Product Form | Thickness | Tensile Strength Min | Yield Strength Min (0.2% offset) | Elongation in 2" Min |
|---|---|---|---|---|
| Sheet & Strip | Up to and including 0.1874 in. | 130 ksi (896 MPa) | 120 ksi (827 MPa) | 10% |
| Plate | Over 1.000 in. to 2.000 in. | 130 ksi (896 MPa) | 120 ksi (827 MPa) | 10% |
| Plate | Over 1.000 in. to 4.000 in. | 130 ksi (896 MPa) | 120 ksi (827 MPa) | 10% |
| Plate | Over 1.000 in. to 6.500 in. | 130 ksi (896 MPa) | 120 ksi (827 MPa) | 10% |
AMS 4911 sheet/plate properties are uniform across thickness unlike AMS 4928 bars (which have size-dependent properties).
The elongation minimum reduces to 8% for the thickest plate sections (>4.000 in.) due to through-thickness texture effects.
Physical Properties
| Property | Value (Imperial) | Value (Metric) |
|---|---|---|
| Density | 0.160 lb/in³ | 4.43 g/cm³ |
| Weight vs. Steel | ~57% the weight of steel | ~57% the weight of steel |
| Melting Range | 2,995°F–3,020°F | 1,646°C–1,660°C |
| Modulus of Elasticity | 16.5 × 10⁶ psi | 114 GPa |
| Thermal Conductivity | 4.2 BTU/(hr·ft·°F) | 7.2 W/(m·K) |
| Coefficient of Thermal Expansion | 4.9 × 10⁻⁶ /°F | 8.8 × 10⁻⁶ /°C |
| Specific Heat | 0.13 BTU/(lb·°F) | 560 J/(kg·K) |
| Service Temperature Range | -350°F to 750°F | -210°C to 400°C |
AMS 4911 vs AMS 4907 - What Is the Difference?
Both AMS 4911 and AMS 4907 cover Ti-6Al-4V titanium sheet, strip, and plate in the annealed condition and use the same product form definitions (sheet ≤0.1874 in., plate 0.1875–6.50 in.).
The key difference is interstitial content:
| Property | AMS 4911 ( Grade5 ) | AMS 4907 (Grade 23 / ELI) |
|---|---|---|
| Grade | Standard Grade 5 | Extra Low Interstitial (ELI) |
| Max Oxygen | 0.20% | 0.13% |
| Max Iron | 0.30% | 0.25% |
| Typical Tensile Min | 130 ksi (896 MPa) | 120 ksi (827 MPa) |
| Fracture Toughness | Standard | Enhanced |
| Ductility | Standard | Enhanced |
| Primary Use | Aerospace structural | Cryogenic, damage-tolerant, medical |
| Relative Cost | Lower | Higher (tighter chemistry controls) |
for standard aerospace structural applications where standard Grade 5 chemistry is acceptable.
where engineering drawings specify ELI grade, or where cryogenic service, maximum fracture toughness, or medical implant use is required.
Machining of AMS 4911
Ti-6Al-4V per AMS 4911 machines comparably to austenitic stainless steel (approximately 20–25% machinability rating vs. 1212 free-machining steel).
Key machining guidance:
- Cutting speed: Use slower cutting speeds than for aluminum or steel; high cutting speeds generate excessive heat and accelerate tool wear
- Coolant: Flood coolant is essential – titanium’s low thermal conductivity concentrates heat at the cutting edge
- Tool material: Carbide tooling recommended; high-speed steel (HSS) acceptable for lighter cuts
- Chip clearance: Sharp tools with positive rake angles help with chip flow – long continuous chips can be a fire risk with fine titanium swarf
- No work hardening: Unlike stainless steel, titanium does not work-harden significantly, but it is prone to galling and adhesion to tooling
- Plate cutting: Fighter Jet Metals offers in-house plate saw cutting and shearing for AMS 4911 plate
Weldability of AMS 4911
Ti-6Al-4V per AMS 4911 sheet and plate is weldable using standard aerospace welding processes:
- GTAW (TIG) welding: is the primary process – use commercially pure titanium or Ti-6Al-4V filler per AMS 4954
- Inert gas shielding is mandatory : argon or helium. Joint, back surface, and trailing shield required until metal cools below 400°F (204°C). Any contact with oxygen or nitrogen above this temperature causes embrittlement (indicated by blue or gray discoloration)
- Electron beam welding (EBW): is used for precision high-quality welds, particularly in engine components
- Post-weld stress relief anneal: is typically performed per AMS 4911 and customer specification to restore heat-affected zone properties
- Weld color quality check: Silver/bright = clean weld. Gold = marginal. Blue or gray = contaminated, unacceptable for aerospace
Safe Handling of AMS 4911 Titanium Sheet and Plate
Titanium sheet and plate scrap, chips, and grinding dust require careful handling:
- Titanium is not pyrophoric in bulk form (solid sheet and plate).
- Thick plates and sheets do not present a fire hazard under normal handling.
- Fine titanium swarf, chips, and grinding dust ARE combustible and must be handled per OSHA and NFPA fire safety guidelines. Keep dry, away from ignition sources.
- Water use on titanium fires is DANGEROUS – titanium reacts with water at high temperatures. Use dry sand or Class D fire extinguisher only.
- Cleaning: Titanium sheet is typically cleaned with acetone or MEK before welding or heat treatment. Chlorinated solvents should be avoided – chloride contamination promotes stress corrosion cracking.
Cross-Reference Specifications for AMS 4911
Sheet, Strip & Plate - ELI Grade (Annealed)
Same product forms (sheet, strip, plate) in ELI grade — reduced interstitials for enhanced toughness
Full 6Al-4V Titanium Specifications List
Want to see the complete specifications for 6Al-4V titanium used in aerospace, defense, and industrial applications? Click the button below to access the full specifications list, covering all major standards and forms.
Trade Names and Equivalent Designations
AMS 4911 Ti-6Al-4V is known by multiple designations across different standards systems:
| Designation | System | Notes |
|---|---|---|
| Ti-6Al-4V | Common name | 6% aluminum, 4% vanadium |
| Ti 6-4 | Industry shorthand | Most widely used shorthand |
| Ti64 / Ti-64 | Industry shorthand | Common in machining/processing |
| Grade 5 Titanium | ASTM designation | Commercially pure grade number |
| ASTM Grade 5 | ASTM B265 | Sheet and strip equivalent in ASTM |
| UNS R56400 | UNS (Unified Numbering System) | Standard material identifier in North America |
| DIN 3.7165 | DIN (German standard) | European designation |
| ISO 5832-3 | ISO | Medical implant standard (same alloy) |
| TC4 | Chinese designation | GB/T standard designation |
Why Source AMS 4928 from Fighter Jet Metals?
Fighter Jet Metals supplies Ti-6Al-4V sheet, strip, and plate to AMS 4911 with full mill certifications, heat-lot traceability, and AS9100D quality system compliance.
All material is supplied with certified mill test reports (CMTR) traceable to origin heat/lot, signed certificate of conformance, and documentation suitable for aerospace first-article and production use.
In-house processing available for AMS 4911 plate and sheet:
Plate saw cutting (thickness and length/width cuts)
Shearing (sheet and thin plate)
Trepanning
Lathe work
Certified Material for Critical Service
Materials supplied in 6Al-4V titanium must meet strict aerospace certification and traceability requirements. Fighter Jet Metals supports sourcing across a wide range of AMS, MIL, and OEM specifications, ensuring compliance with industry standards.
All material is supplied with full mill certifications, complete heat-lot traceability, and detailed documentation. This ensures reliability and suitability for safety-critical aerospace, defense, and high-performance engineering applications.