SAE AMS4413C-2023
Aluminum Alloy, Plate 3.5Cu - 1.0Li - 0.40Mg - 0.35Mn - 0.45Ag - 0.12Zr (2050-T84) Solution Heat Treated, Stress Relieved, and Artificially Aged
- Standard No.
- SAE AMS4413C-2023
- Release Date
- 2023
- Published By
- Society of Automotive Engineers (SAE) US / SAE
- Latest
- SAE AMS4413C-2023
- Introduction
AMS4413C Standard Core Update and Technology Evolution
The 2023 revision of the AMS4413C standard includes five major changes: the maximum product thickness is expanded to 8 inches (203.2 mm), the SI unit elongation values are aligned with the AMS Editorial Guide, the SL fracture toughness requirement for the 12.5-38.2 mm thickness range is removed, a prohibition clause for unauthorized exceptions is added, and the standard structure is optimized. These changes reflect the growing demand for large-scale components made of 2050-T84 aluminum alloy in the aerospace industry.
Material Properties and Composition Control
Element Minimum value (%) Maximum value (%) Function and effect Copper (Cu) 3.2 3.9 Improve strength and age hardening effect Lithium (Li) 0.7 1.3 Reduce density and increase elastic modulus Silver (Ag) 0.2 0.7 Optimized precipitate distribution The alloy achieves its optimal performance combination through a 3.5% permanent tensile strain and T84 aging treatment. The heat treatment process parameters are proprietary to the manufacturer.
Mechanical Property Index System
Typical Application Case: The wing ribs of a commercial aircraft use 4.5-inch (114mm) thick 2050-T84 plate. The measured longitudinal properties of the plate achieved: a tensile strength of 503MPa, a yield strength of 455MPa, an elongation of 7%, and a KIc fracture toughness value of 34MPa√m, fully meeting the requirements of the primary load-bearing structure.
The standard specifies mechanical properties that must be met in different thickness ranges. The short transverse yield strength of 8-inch thick plates remains ≥400MPa, demonstrating excellent isotropy.
Quality Assurance Critical Control Points
- Ultrasonic Testing: Must comply with ASTM B594 Class A requirements.
- Stress Corrosion Testing: Plates thicker than 19mm must pass a 30-day stress test at 45ksi (310MPa).
- Fracture Toughness: The maximum requirement in the LT direction is 36MPa√m (12.7-38.1mm).
Engineering Implementation Recommendations
Special attention should be paid during procurement: For plates outside the standard thickness range (0.5-8 inches), special performance requirements must be clearly stated in the order. If fracture toughness testing is required, the specimen orientation (LT/TL/SL) must be specified. It is recommended to establish a material database to record the measured performance data of each batch, especially the performance degradation in the center area of thick plates.
SAE AMS4413C-2023 Referenced Document
- ANSI H35.2 DIMENSIONAL TOLERANCES FOR ALUMINUM MILL PRODUCTS
- ANSI H35.2M American National Standard Dimensional Tolerances for Aluminum Mill Products
- ASTM B594 Standard Practice for Ultrasonic Inspection of Aluminum-Alloy Wrought Products for Aerospace Applications
- ASTM B660 Standard Practices for Packaging/Packing of Aluminum and Magnesium Products
- ASTM B666/B666M Standard Practice for Identification Marking of Aluminum and Magnesium Products
- ASTM E399 Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials
- ASTM G47 Standard Test Method for Determining Susceptibility to Stress-Corrosion Cracking of 2XXX and 7XXX Aluminum Alloy Products
SAE AMS4413C-2023 history
- 2023 SAE AMS4413C-2023 Aluminum Alloy, Plate 3.5Cu - 1.0Li - 0.40Mg - 0.35Mn - 0.45Ag - 0.12Zr (2050-T84) Solution Heat Treated, Stress Relieved, and Artificially Aged
- 2019 SAE AMS4413B-2019 Aluminum Alloy, Plate 3.5Cu - 1.0Li - 0.40Mg - 0.35Mn - 0.45Ag - 0.12Zr (2050-T84) Solution Heat Treated, Stress Relieved, and Artificially Aged
- 2012 SAE AMS4413A-2012 Aluminum Alloy, Plate 3.5 Cu 1.0Li 0.40Mg 0.35Mn 0.45Ag 0.12Zr (2050-T84) Solution Heat Treated, Stress Relieved, and Artificially Aged
- 2007 SAE AMS4413-2007 Aluminum Alloy@ Plate 3.5 Cu - 1.0Li - .40Mg - .35 Mn - .45Ag - 0.12Zr (2050-T84) Solution Heat Treated@ Stress Relieved@ and Artificially Aged (UNS A92050)
