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AEROSPACE
MATERIAL
SPECIFICATION
AMS-QQ-A-225/9
Issued
Reaffirmed
JUL 1997
APR 2007
Aluminum Alloy 7075, Bar, Rod, Wire, and Special Shapes;
Rolled, Drawn, or Cold Finished
A97075
RATIONALE
This document has been reaffirmed to comply with the SAE 5-year Review policy.
NOTICE
This document has been taken directly from Federal Specification QQ-A-225/9E and contains only
minor editorial and format changes required to bring it into conformance with the publishing
requirements of SAE technical standards.
The original Federal Specification was adopted as an SAE standard under the provisions of the SAE
Technical Standards Board (TSB) Rules and Regulations (TSB 001) pertaining to accelerated
adoption of government specifications and standards. TSB rules provide for (a) the publication of
portions of unrevised government specifications and standards without consensus voting at the SAE
Committee level, (b) the use of the existing government specification and standard format, and (c)
the exclusion of any qualified product list (QPL) sections.
The complete requirements for procuring 7075 aluminum alloy bar, rod, wire, and special shapes
described herein shall consist of this document and the latest issue of AMS-QQ-A-225.
SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely
voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, i s the sole responsibility of the user.”
SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.
Copyright © 2007 SAE International
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying,
recording, or otherwise, without the prior written permission of SAE.
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1. SCOPE AND CLASSIFICATION:
1.1
Scope:
This specification covers the specific requirements for 7075 aluminum alloy bar, rod, wire, and
special shapes produced by rolling, drawing, or cold finishing.
1.2
Classification:
1.2.1
Tempers: Bar, rod, wire, and special shapes are of the following tempers, as specified (See 6.2):
O, T6, T62, T651, T73, or T7351 temper. Definitions of these tempers are specified in
AMS-QQ-A-225.
2. APPLICABLE DOCUMENTS:
See AMS-QQ-A-225.
3. REQUIREMENTS:
3.1
Chemical Composition:
The chemical composition shall conform to the requirements specified in Table I.
Chemical Composition 1/
л®½»²¬
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îòï
îòç
ïòî
îòð
ðòïè
ðòîè
ó
ðòëð
ó
ðòìð
ó
ðòíð
ó
ðòîð
ó
ðòðë
ó
ðòïë
λ³¿·²¼»®
Zinc
Magnesium
Copper
Chromium
Iron
Silicon
Manganese
Titanium
Other Elements, each
Other Elements, total
Aluminum
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3.2
3.2.1
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Mechanical Properties:
Mechanical Properties of Material as Supplied: The mechanical properties in the direction of
working shall conform to the requirements of Table II for the temper specified.
ÌßÞÔÛ ×ò Ó»½¸¿²·½¿´ Ю±°»®¬·»- øÍ»» êòì÷
Ì»³°»®
O
T6 and
T62 4/
T651 1/
T73 5/
T7351
1/ 5/
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¿¬ ðòî °»®½»²¬
Ѻº-»¬ ±®
¿¬ Û¨¬»²-·±²
Indicated 6/
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«²¼»® ´±¿¼ô
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Û´±²¹¿¬·±²
·² î ·²ò
±® ì ¬·³»diameter 6/
³·²·³«³ô
°»®½»²¬
Up to 8.000,
incl
Up to 4.000,
incl 3/
0.500 to 4.000,
incl 3/
Up to 3.000,
incl 3/
0.500 to 3.000,
incl 3/
40.0 2/
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êêòð
ðòððèì
é
ééòð
êêòð
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é
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·²½¸»-ò
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3.2.2
3.3
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Mechanical Properties After Heat Treatment: In addition to conforming to the requirements of
3.2.1, the mechanical properties in the direction of working of material ordered in the annealed (O)
temper, and without subsequent cold-working or forming operations, and subsequently solution
heat-treated and artificially aged shall conform to the requirements specified in Table II for the T6,
T62, and T73 tempers. Material as received in the T6, T651, T73, and T7351 tempers shall, after
proper re-solution heat treatment and aging, be capable of conforming to the requirements
specified in Table II for the T6, T62, and T73 tempers. Material in the T6, T62, and T651 tempers
shall after proper aging be capable of conforming to the requirements specified in Table II for the
T73 or T7351 tempers, as applicable. See AMS-QQ-A-225 for the solution and aging treatments.
Finish:
Unless otherwise specified in the contract or purchase order (See 6.2), rod up to and including 3
inches in diameter, and bar up to and including 2 inches thick (with maximum width for rectangles of
4 inches) shall be processed to size by cold finishing.
3.4
Stress-Corrosion Cracking (SCC):
3.4.1
Resistance to SCC: Material in the T73 or T7351 tempers shall be capable of exhibiting no
evidence of stress-corrosion cracking when subjected to the test specified in 4.2. The supplier
shall maintain records of the performance of all lots so tested.
3.4.2
Acceptance Criteria: Susceptibility to stress-corrosion cracking for each lot of 7075-T73 and T7351
material shall be established by testing the previously selected tensile specimens to the following
criteria:
a. Determine electrical conductivity and tensile properties
b. If the conductivity is below 38.0 percent International Annealed Copper Standard (IACS), the
material is considered unsatisfactory and must be reprocessed, regardless of property level
c. If the conductivity is 40 percent IACS or higher and tensile properties meet the minimum values
specified herein, the material is considered to be satisfactory
d. If conductivity is 38 to 40 percent IACS, if tensile properties meet the minimum limits specified
herein, and if the yield strength does not exceed the specified minimum by more than 11.9 ksi,
the material is considered to be satisfactory
e. If conductivity is below 40 percent IACS and the yield strength exceeds the specified minimum
value by 12.0 ksi or more, the material is considered suspect
f. When material is considered suspect, it may be reprocessed or a sample of the material may
be heat-treated for not less than 30 minutes at 870°F ± 10, quenched in cold water.
Conductivity shall then be measured within 15 minutes after quenching. If the difference
between this measurement and the original measurement on the T73 or T7351 material is
6 percentage points or more, the T73 or T7351 temper material is satisfactory. If the difference
is less than 6 percentage points, the T73 or T7351 material must be reprocessed
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3.5
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Marking:
In addition to marking required in AMS-QQ-A-225, material in the T6, T651, T73 and T7351 tempers
shall be identified by a lot number marked in at least one location on each piece (See 6.2).
4. QUALITY ASSURANCE PROVISIONS:
See AMS-QQ-A-225 and the following:
4.1
Number of Tests After Heat Treatment:
From material in the annealed (O) temper, an additional number of specimens equal to those
required by AMS-QQ-A-225 shall be taken and tested after solution heat treatment and artificial
aging to determine compliance with 3.2.2.
4.2
Stress-Corrosion Cracking Test:
Specimens of 7075-T73 and T7351 alloy shall be selected in a manner that will permit application of
the specified tensile stress in the short-transverse grain direction (See 4.2.4). The specimens shall
be subjected to the following stress-corrosion test:
4.2.1
Thirty days’ exposure.
4.2.2
Stressed in the short-transverse direction with respect to grain flow and held at a constant strain.
The stress level shall be 75 percent of the specified longitudinal yield strength.
4.2.3
The stressed specimens shall be exposed to a solution of 3.5 percent NaCl conforming to the
purity and pH requirements of ASTM B 117, at room temperature, by alternate immersion. The
exposure cycle shall consist of 10 minutes immersion in the solution and 50 minutes out of the
solution.
4.2.4
For material thicknesses under 0.700 inch, the specimen tested shall be a tension specimen
selected so that the applied stress is, if possible, parallel in direction to the smallest dimension of
the product which is over 0.700 inch.
5. PREPARATION FOR DELIVERY:
See AMS-QQ-A-225.
6. NOTES:
6.1
Intended Use:
This alloy is intended for use where high strength and good corrosion resistance are required.
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6.2
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Ordering Data:
Purchasers should select the preferred options permitted herein and include the following
information in procurement documents:
Title, number, and date of this specification
Form, quantity, and temper required (See 1.2.1)
Dimensions required
Mechanical properties and dimensional tolerance requirements for sizes not specifically covered
Finish requirements (See 3.3)
Whether there are special end use requirements
For military agencies: Selection of applicable levels of preservation, packaging, and packing
required. Also specify marking requirements (See AMS-QQ-A-225)
For civil agencies: Specify packing level, level A, or commercial. Also specify marking requirements
(See AMS-QQ-A-225)
6.3
Product produced and marked to the requirements of AMS-QQ-A-225/9 also meets the requirements
of QQ-A-225/9E. Product produced and marked to the requirements of QQ-A-225/9E also meets the
requirements of AMS-QQ-A-225/9.
6.4
Properties listed in 3.2.1 are exactly the same as QQ-A-225/9, Revision E. These properties have
not been substantiated in accordance with the AMS Manual for Preparation of Aerospace
Specifications.
PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE "D"
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