1、 _ 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 ther
2、efrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this
3、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. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-49
4、70 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/AMS4485A AEROSPACE MATERIAL SPECIFICATION AMS4485 REV. A Issued 2012-12 Revised 2017-08 Supers
5、eding AMS4485 Magnesium Alloy, Extrusions 4.0Y - 2.25Nd - 0.5Zr (WE43C - T5) Precipitation Heat Treated (Composition similar to UNS M18434) RATIONALE AMS4485A revises Composition (Table 1, 3.1.1), Properties (3.4), and Reports (4.4.1), and is a Five-Year Review and update of this specification. 1. S
6、COPE 1.1 Form This specification covers a magnesium alloy in the form of extruded bars, rods, wire, tubing, and profiles from 0.039 to 4.75 inches, incl. (12.71.0 to 120.7 mm., incl.) in nominal thickness (see 8.4). 1.2 Application These extrusions have been used typically for parts requiring a comb
7、ination of light weight, high yield strength up to 480 F (250 C), relatively high corrosion resistance, and good flammability resistance for magnesium alloys,but usage is not limited to such applications. 2. APPLICABLE DOCUMENTS The issue of the following documents in effect on the date of the purch
8、ase order forms a part of this specification to the extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is specified. When the referenced document has been cancelled and no superseding document has been specified, the last published
9、issue of that document shall apply. 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. AMS2355 Quality Assurance Sampling and Testing, Aluminum Alloys and M
10、agnesium Alloys, Wrought Products, Except Forging Stock, and Rolled, Forged, or Flash Welded Rings AMS2750 Pyrometry ARP1917 Clarification of Terms Used in Aerospace Metals Specifications SAE INTERNATIONAL AMS4485A Page 2 of 5 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor
11、Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM B117 Operating Salt Spray (Fog) Apparatus ASTM B557/B557M Tension Testing Wrought and Cast Aluminium- and Magnesium- Alloy Products ASTM B660 Packaging/Packing of Aluminum and Magnesium Products ASTM B666/B
12、666M Identification Marking of Aluminum and Magnesium Products ASTM B953 Sampling Magnesium and Magnesium Alloys for Spectrochemical Analysis ASTM B954 Analysis of Magnesium and Magnesium Alloys by Atomic Emission Spectrometry 3. TECHNICAL REQUIREMENTS 3.1 Composition Shall conform to the percentage
13、s by weight shown in Table 1, determined by spectrochemical methods in accordance with ASTM B954, or by other analytical methods acceptible to purchaser. Table 1 - Composition Element Min Max Yttrium Neodymium Zinc 3.7 2.0 - 4.3 2.5 0.06 Zirconium Samarium (3.1.1) Ytterbium Gadolinium + Erbium + Dys
14、prosium (3.1.1) Other Rare Earths Manganese Copper Iron Nickel 0.2 - - 0.3 - - - - - 1.0 0.04 0.02 1.0 1.0 0.03 0.02 0.005 0.0020 Other Elements, each (3.1.2) - 0.01 Magnesium remainder 3.1.1 Other Rare Earths are heavy rare earths that include, but are not limited to the heavy rare earths specified
15、 in Table 1, (e.g., Gadolinium, Dysprosium, Erbium, Samarium, and Ytterbium). 3.1.2 Determination not required for routine acceptance 3.2 Condition Precipitation heat treated. 3.2.1 Extrusions shall be supplied with an as-extruded surface finish. Light polishing to remove minor surface imperfections
16、 is permissible, provided such imperfections can be removed within specified dimensional tolerances. 3.3 Heat Treatment Extrusions shall be precipitation heat treated by heating to a temperature between 392 to 482 F (200 to 250 C), and holding at the selected temperature 10 F (6 C) for the proper ti
17、me for precipitation heat treatment to meet the requirements of 3.4, and air cooling. Pyrometry shall be in accordance with AMS2750. SAE INTERNATIONAL AMS4485A Page 3 of 5 3.4 Properties 3.4.1 Tensile Properties Extrusions 0.039 to 4.75 inches, incl. (1.0 to 120.7 mm, incl.) in nominal thickness, sh
18、all have tensile properties as specified in Table 2, determined in accordance with ASTM B557 or ASTM B557M. Table 2 Table 2A - Minimum tensile properties, inch/pound units Tensile Strength ksi Yield Strength at 0.2% Offset ksi Elongation in 4D % 44.0 28.0 6 Table 2B - Minimum tensile properties, SI
19、units Tensile Strength MPa Yield Strength at 0.2% Offset MPa Elongation in 4D % 303 195 6 3.4.2 Mechanical property requirements for product outside of the range covered by 1.1 shall be agreed upon between purchaser and producer. 3.4.3 Corrosion Resistance Corrosion rate of material, tested in accor
20、dance with 3.4.2.1, shall be less than 50 mpy. 3.4.3.1 Corrosion rate shall be determined in accordance with ASTM B117 except that, prior to exposure, specimens shall be accurately weighed to within 0.01 g (W1). Specimens shall be exposed to the salt spray for not less than 120 hours. Following expo
21、sure, specimens shall be rinsed with tap water and cleaned of adherent corrosion product by immersing in a hot (190 F (88 C) 20% Chromic acid plus 1% silver nitrate solution for 1 to 2 minutes. Cleaned specimens shall be rinsed in hot water, dried in a stream of hot air, and weighed (W2). The measur
22、ed weight loss (WL) shall be calculated (W1 - W2) and used for calculating corrosion rate, using the following equations: CR (mcd) = WL / (SA x EP) (Eq. 1) CR mils (0.001 inch) per year = (CR (mcd) / D) x 143.7 (Eq. 2) where: WL = measure weight loss in mg SA = total surface area of specimen in cm2
23、EP = exposure time in days D = density, 1.82 g/cm3 mcd = mg/cm2 per day 3.5 Quality Extrusions, as received by purchaser, shall be uniform in quality and condition, sound, and free from foreign materials and from imperfections detrimental to usage of the extrusions. SAE INTERNATIONAL AMS4485A Page 4
24、 of 5 3.6 Tolerances Shall conform to all applicable requirements of ANSI H35.2 or ANSI H35.2M. 4. QUALITY ASSURANCE PROVISIONS 4.1 Responsibility for Inspection The producer of extrusions shall supply all samples for producers tests and shall be responsible for the performance of all required tests
25、. Purchaser reserves the right to sample and to perform any confirmatory testing deemed necessary to ensure that the extrusions conform to specified requirements. 4.2 Classification of Tests 4.2.1 Acceptance Tests Composition (3.1), tensile properties (3.4.1), and tolerances (3.6) are acceptance tes
26、ts and shall be performed on each inspection lot. 4.2.2 Periodic Tests Corrosion resistance (3.4.2) is a periodic test and shall be performed at a frequency selected by the producer unless frequency of testing is specified by purchaser. 4.3 Sampling and Testing Shall be in accordance with AMS2355 4.
27、4 Reports The producer of extrusions shall furnish with each shipment a report showing the results of tests for composition and tensile properties of each inspection lot and stating that the extrusions conform to the periodic test properties when performed and to the other technical requirements. Th
28、is report shall include the purchase order number, inspection lot number, AMS4485A, size or section identification number, and quantity. 4.4.1 When the product size is outside the range covered by 1.1, the report shall contain a statement to that effect. 4.4.2 When material produced to this specific
29、ation is beyond the sizes allowed in the scope of tables, or other exceptions are taken to the technical requirements listed in Section 3 (see 5.1.1), the report shall contain a statement “This material is certified as AMS4485A(EXC) because of the following exceptions.” and the specific exceptions s
30、hall be listed. 4.5 Resampling and Retesting Shall be in accordance with AMS2355. 5. PREPARATION FOR DELIVERY 5.1 Identification Shall be in accordance with ASTM B666/B666M. 5.2 Packaging Extrusions shall be prepared for shipment in accordance with ASTM B660 and in compliance with applicable rules a
31、nd regulations pertaining to the handling, packaging, and transportation of the extrusions to ensure carrier acceptance and safe delivery. SAE INTERNATIONAL AMS4485A Page 5 of 5 6. ACKNOWLEDGMENT A producer shall mention this specification number in all quotations and when acknowledging purchase ord
32、ers. 7. REJECTIONS Extrusions not conforming to this specification, or to modifications authorized by purchaser, will be subject to rejection. 8. NOTES 8.1 Revision Indicator A change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions, n
33、ot editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editoria
34、l changes only. 8.2 Terms used in AMS are clarified in ARP1917. 8.3 Dimensions and properties in inch/pound units and the Fahrenheit temperatures are primary; dimensions and properties in SI units and the Celsius temperatures are shown as the approximate equivalents of the primary units and are pres
35、ented only for information. 8.4 Purchase documents should specify not less than the following: AMS4485A Form and size or section identification number of extrusions desired Property and acceptance requirements from the cognizant engineering organization applicable to sizes outside the range listed in 1.1 Quantity of extrusions desired PREPARED BY AMS COMMITTEE “D”
