SAE AMS4100G-2024
Aluminum Alloy, Alclad, Sheet 5.7Zn - 2.2Mg - 1.6Cu - 0.22Cr (Alclad 7475-T761) Solution and Precipitation Heat Treated

Standard No.

SAE AMS4100G-2024

Release Date

2024

Published By

Society of Automotive Engineers (SAE)  US  /  SAE

Latest

SAE AMS4100G-2024

Introduction

Analysis of Core Changes in the Standard

Revisions	AMS4100F	AMS4100G
Exception Handling	Special Exceptions Allowed	Explicitly Prohibit Unauthorized Exceptions (3.3.6/3.6)
Definition Location	Scattered in Various Chapters	Concentrated in Chapter 2.4
Corrosion Test Standards	Old Version of ASTM G34	Updated Conductivity Threshold (39.0% IACS)

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Material Properties Specifications

Core Alloy Composition (7475)

Main alloy element content: Zn 5.2-6.2%, Mg 1.9-2.6%, Cu 1.2-1.9%, tested by spectral analyzer to meet AMS2355 requirements.

Characteristics of aluminum cladding (7072)

Zn content 0.8-1.3%, thickness varies with substrate:
≤1.57mm plate: average aluminum cladding ≥3.2%
4.75-6.32mm plate: average aluminum cladding ≥1.2%

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Mechanical performance requirements

Thickness (mm)	Tensile Strength		Yield Strength		Elongation (%)
	ksi	MPa	ksi	MPa
1.02-1.57	66.0	455	55.0	379	9
4.75-6.32	70.0	483	60.0	414	9

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Implementation Suggestions

Purchasing Notes

• Orders must clearly indicate AMS4100G version
• Out-of-range dimensions (＞6.32mm) require special agreement on mechanical properties
• Suppliers are required to provide complete fracture toughness test reports

Key points of quality control

1. Each batch must undergo electrical conductivity testing (≥39% IACS)
2. Plates with a thickness ≥2.54mm must undergo exfoliation corrosion testing (≤EB grade)
3. Yield strength must be retested when it exceeds the lower limit of 62MPa

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Technological evolution analysis

From the first edition in 1979 to the 2024 G edition, the main improvement directions are:

• 1980s: Focus on improving mechanical properties
• After 2000: Strengthening corrosion protection requirements
• 2024 edition: Improving the quality traceability system and adding exception clause management

SAE AMS4100G-2024 Referenced Document

• ANSI H35.2 DIMENSIONAL TOLERANCES FOR ALUMINUM MILL PRODUCTS
• ANSI H35.2M American National Standard Dimensional Tolerances for Aluminum Mill Products
• ASTM B646 Standard Practice for Fracture Toughness Testing of Aluminum Alloys
• 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 E561 Standard Practice for R-Curve Determination
• ASTM G34 Standard Test Method for Exfoliation Corrosion Susceptibility in 2XXX and 7XXX Series Aluminum Alloys (EXCO Test)

SAE AMS4100G-2024 history

• 2024 SAE AMS4100G-2024 Aluminum Alloy, Alclad, Sheet 5.7Zn - 2.2Mg - 1.6Cu - 0.22Cr (Alclad 7475-T761) Solution and Precipitation Heat Treated
• 2016 SAE AMS4100F-2016 Aluminum Alloy, Alclad, Sheet 5.7Zn - 2.2Mg - 1.6Cu - 0.22Cr (Alclad 7475-T761) Solution and Precipitation Heat Treated
• 2010 SAE AMS4100E-2010 Aluminum Alloy, Alclad, Sheet 5.7Zn - 2.2Mg - 1.6Cu - 0.22Cr (Alclad 7475-T761) Solution and Precipitation Heat Treated (UNS A87475)
• 2007 SAE AMS4100D-2007 Aluminum Alloy, Alclad, Sheet 5.7Zn 2.2Mg 1.6Cu 0.22Cr (Alclad 7475-T761) Solution and Precipitation Heat Treated
• 2000 SAE AMS4100C-2000 Aluminum Alloy, Alclad, Sheet 5.7Zn 2.2Mg 1.6Cu 0.22Cr (Alclad 7475-T761) Solution and Precipitation Heat Treated
• 1993 SAE AMS4100B-1993 Aluminum Alloy Sheet@ Alclad 5.7Zn - 2.2Mg - 1.6Cu - 0.22Cr (ALC 7475 -T761) Solution and Precipitation Heat Treated (UNS A87475)
• 1987 SAE AMS4100A-1987 Aluminum Alloy Sheet@ Alclad 5.7Zn - 2.2Mg - 1.6Cu - 0.22Cr (7475-T761) Solution and Precipitation Heat Treated (UNS A97475)
• 1979 SAE AMS4100-1979 ALUMINUM ALLOY SHEET, ALCLAD 5.7Zn - 2.2Mg - 1.6Cu - 0.22Cr (7475-T761)

Standard and Specification