Ti-6Al-4V: AMS 4928 vs AMS 4965
Ti-6Al-4V is a titanium alloy commonly used in aerospace, medical, and high performance applications for its excellent strength-to-weight ratio, corrosion resistance, and high temperature stability. When comparing AMS 4928 and AMS 4965, the two specifications cover different forms of Ti-6Al-4V and differ in processing and intended applications.
Product form: AMS 4928 vs AMS 4965
AMS 4928 Ti-6Al-4V, UNS R56400 Form
This specification covers a titanium alloy in the form of bars, wire, forgings, flash welded rings, drawn shapes up through 6.000 inches (152.40 mm) inclusive in diameter or least distance between parallel sides and stock of any size for forging or flash welded rings.
AMS 4965 Ti-6Al-4V, UNS R56400 Form
This specification covers a titanium alloy in the form of bars, wire, forgings, and flash welded rings 4.000 inches (101.60 mm) and under in nominal diameter or least distance between parallel sides and of stock for forging and flash welded rings.
Chemical composition: AMS 4928 vs AMS 4965
AMS 4928 Ti-6Al-4V, UNS R56400 Chemical Composition
| Element | Min. | Max. |
| Aluminum | 5.50 | 6.75 |
| Vanadium | 3.50 | 4.50 |
| Iron | — | 0.30 |
| Oxygen | — | 0.20 |
| Carbon | — | 0.08 |
| Nitrogen | — | 0.05 (500 ppm) |
| Hydrogen (3.1.1) | — | 0.0125 (125 ppm) |
| Yttrium (3.1.2) | — | 0.005 (50 ppm) |
| Other Elements, each (3.1.2) | — | 0.10 |
| Other Elements, total (3.1.2) | — | 0.40 |
| Titanium | Remainder | — |
AMS 4965 Ti-6Al-4V, UNS R56400 Chemical Composition
| Element | Min. | Max. |
| Aluminum | 5.50 | 6.75 |
| Vanadium | 3.50 | 4.50 |
| Iron | — | 0.30 |
| Oxygen | — | 0.20 |
| Carbon | — | 0.08 |
| Nitrogen | — | 0.05 (500 ppm) |
| Hydrogen (3.1.1) | — | 0.0125 (125 ppm) |
| Yttrium (3.1.2) | — | 0.005 (50 ppm) |
| Other elements, each (3.1.2) | — | 0.10 |
| Other elements, total (3.1.2) | — | 0.40 |
| Titanium | Remainder |
Mechanical properties: AMS 4928 vs AMS 4965
AMS 4928 Ti-6Al-4V, UNS R56400 Mechanical Properties
| Nominal Diameter or Least Distance Between Parallel Sides (mm) | Tensile Strength (MPa) | Yield Strength at 0.2% Offset (MPa) | Elongation in 50.8 mm or 4D % Long. | Elongation in 50.8 mm or 4D % L.T. | Elongation in 50.8 mm or 4D % S.T. | Reduction of Area % Long. | Reduction of Area % L.T. | Reduction of Area % S.T. (2) |
| Up to 50.80, incl (1) | 931 | 862 | 10 | 10 | — | XXV | 20 | 20 |
| Over 50.80 to 101.60, incl | 896 | 827 | 10 | 10 | 10 | XXV | 20 | 15 |
| Over 101.60 to 152.40, incl. (3) | 896 | 827 | 10 | 10 | 8 | 20 | 20 | 15 |
| Note: Long. = longitudinal LT = long horizontal ST = short horizontal | ||||||||
| 1. Tensile strength of 130 ksi (896 MPa) minimum and yield strength of 120 ksi (827 MPa) minimum are permitted for wire or rod for fastener applications and for flash welded rings made from extrusions up to 2.000 inches (50.80 mm), inclusive, in distance between parallel sides. | ||||||||
| 2. Short-transverse reduction of area is waived for flash welded rings made from extrusions. | ||||||||
| 3. See 8.3. | ||||||||
AMS 4965 Ti-6Al-4V, UNS R56400 Mechanical Properties
| Nominal Diameter or Distance Between Parallel Sides | Tensile Strength | Yield Strength at 0.2% Offset |
Elongation (1) in 50.8 mm or 4D, L |
Elongation (1) in 50.8 mm or 4D, T |
Reduction of Area, L |
| mm | MPa | MPa | (%) | (%) | (%) |
| Up to 12.70, incl. | 1138 | 1069 | 10 | — | 20 |
| Over 12.70 to 25.40, incl. | 1103 | 1034 | 10 | — | 20 |
| Over 25.40 to 38.10, incl. | 1069 | 1000 | 10 | — | 20 |
| Over 38.10 to 50.80, incl. | 1034 | 965 | 10 | — | 20 |
| Over 50.80 to 76.20, incl. | 965 | 896 | 10 | 8 | 20 |
| Over 76.20 to 101.60, incl. | 896 | 827 | 8 | 6 | 20 |
| NOTE: For forgings, the elongation in all dimensions shall not be less than 8% (L) and 6% (T). | |||||
| Nominal Thickness | Nominal Width | Tensile Strength | Yield Strength at 0.2% Offset |
Elongation in 50.8 mm or 4D, L | Elongation in 50.8 mm or 4D, T | Reduction of Area, L |
| mm | mm | MPa | MPa | (%) | (%) | (%) |
| Up to 12.70, incl. | Over 12.70 to 203.20, incl. | 1103 | 1034 | 10 | 10 | 25 |
| Over 12.70 to 25.40, incl. | Over 25.40 to 101.60, incl. | 1069 | 1000 | 10 | 10 | 20 |
| Over 12.70 to 25.40, incl. | Over 101.60 to 203.20, incl. | 1034 | 965 | 10 | 10 | 20 |
| Over 25.40 to 38.10, incl. | Over 25.40 to 101.60, incl. | 1034 | 965 | 10 | 10 | 20 |
| Over 25.40 to 38.10, incl. | Over 101.60 to 203.20, incl. | 1000 | 931 | 10 | 10 | 20 |
| Over 38.10 to 50.80, incl. | Over 50.80 to 101.60, incl. | 1000 | 931 | 10 | 10 | 20 |
| Over 38.10 to 50.80, incl. | Over 101.60 to 203.20, incl. | 965 | 896 | 10 | 10 | 20 |
| Over 50.80 to 76.20, incl. | Over 76.20 to 203.20, incl. | 965 | 862 | 10 | 8 | 20 |
| Over 76.20 to 101.60, incl. | Over 101.60 to 203.20, incl. | 896 | 827 | 8 | 6 | 20 |
Melting Practices: AMS 4928 vs AMS 4965
AMS 4928 Ti-6Al-4V, UNS R56400 Melting Practice
Alloy shall be multiple melted. The first melt shall be made by vacuum consumable electrode, nonconsumable electrode, electron beam cold hearth, or plasma arc cold hearth melting practice. The subsequent melt or melts shall be made under vacuum using vacuum arc remelting (VAR) practice. Alloy additions are not permitted in the final melt cycle.
The atmosphere for nonconsumable electrode melting shall be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury.
The electrode tip for nonconsumable electrode melting shall be water-cooled copper.
AMS 4965 Ti-6Al-4V, UNS R56400 Melting Practice
Alloy shall be multiple melted; melting cycle(s) prior to final melting cycle shall be made using consumable electrode, nonconsumable electrode, electron beam, or plasma arc melting practices. The final melting cycle shall be made under vacuum using consumable electrode practice with no alloy additions permitted.
The atmosphere for nonconsumable electrode melting shall be vacuum or shall be argon and/or helium at an absolute pressure not higher than 1000 mm of mercury.
The electrode tip for nonconsumable electrode melting shall be water-cooled copper.
Heat treatment: AMS 4928 vs AMS 4965
AMS 4928 Ti-6Al-4V, UNS R56400 Heat Treatment
Bars, wire, forgings, drawn shapes and flash welded rings shall be heat treated as follows; pyrometry shall be in accordance with AMS2750.
1. Solution Heat Treatment
Except as specified in 3.4.3 when solution heat treatment is used, heat to a temperature within the range 50 to 150 °F (28 to 83 °C) degrees below the beta transus, hold at the selected temperature within ±25 °F (±14 °C) for a time commensurate with section thickness and the heating equipment and procedure used, and cool at a rate equivalent to an air cool or faster.
2. Annealing
Except as specified in 3.4.3, heat to a temperature within the range 1300 to 1450 °F (704 to 788 °C), hold at the selected temperature within ±25 °F (±14 °C) for not less than 1 hour, and cool as required.
3. Continuous Heat Treating
Wire 0.125 inch (3.18 mm) and under in diameter may be continuously heat treated provided that process parameters (e.g., furnace temperature set points, heat input, travel rate, etc.) for continuous heat treating lines shall be established by the material producer and validated by testing of product to requirements of 3.5.
AMS 4965 Ti-6Al-4V, UNS R56400 Heat Treatment
Bars, wire, forgings, and flash welded rings shall be solution heat treated by heating in a suitable atmosphere to 1750 °F ± 25 (954 °C ± 14), holding at heat for 1 to 2 hours, and quenching in agitated water, and aged by heating to a temperature within the range 900 to 1150 °F (482 to 621 °C), holding at the selected temperature within ±15 °F (±8 °C) for 4 to 8 hours, and cooling in air. Pyrometry shall be in accordance with AMS 2750.
Application: AMS 4928 vs AMS 4965
AMS 4928 Ti-6Al-4V, UNS R56400 Application
These products have been used typically for parts requiring moderate strength with a maximum service temperature in the 750 to 900 °F (399 to 510 °C) range depending on time at temperature where the product is to be used in the annealed condition, but usage is not limited to such applications.
AMS 4965 Ti-6Al-4V, UNS R56400 Application
These products have been used typically for parts which are machined after solution heat treatment and aging and are suitable for parts requiring high strength-to-weight ratios up to moderately elevated temperatures, but usage is not limited to such applications.
