“7068 aluminium alloy”的意思、由来-开放百科全书

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7068 aluminium alloy

释义

Technical Description
Uses
Standard specifications
References

7068 aluminium alloy is one of the strongest commercially available aluminium alloys, with a tensile strength comparable to that of some steels. 7068-T6511 has typical ultimate tensile strength of {{convert|710|MPa|ksi|abbr=on}} versus a similar product produced from 7075-T6511 that would have a typical ultimate tensile strength of {{convert|640|MPa|ksi|abbr=on}}. Typical yield strength for alloy 7068-T6511 is {{convert|683|MPa|ksi|abbr=on}} versus {{convert|590|MPa|ksi|abbr=on}} for a similar product produced from 7075-T6511.^[1] Strength allowables for this alloy are provided in Metallic Materials Properties Development and Standardization for design.^[2]

The main alloying elements are zinc (7.3–8.3%), magnesium (2.2–3.0%), copper (1.6–2.4%) and zirconium (0.05–0.15%), with traces of silicon, iron, manganese, chromium, titanium.

Technical Description

7068 alloy is a 7000 series aluminium-zinc alloy registered with the US Aluminium Association and produced to AMS 4331 (chemical composition and mechanical properties) and AMS 2772 (heat treatment). 7068 alloy ‘A’ and ‘B’ tensile data and fatigue properties have been ratified for inclusion in MIL Handbook 5 / MMPDS. It should be stressed that, although the above standards form the basis for 7068 alloy supply, a consistent, optimised property combination is only achieved by Kaiser Aluminum by the targeting of a much tighter composition window and proprietary knowledge of the heat treatment regime and metal processing techniques that only the alloy developer, with the experience of long term, volume production, can possess.

Uses

Primarily developed for ordnance applications, alloy 7068 is now being used or considered for markets like the aerospace and automotive industries (valve body and connecting rod applications), medical devices, such as prosthetic limbs, as well as recreational products like bicycles and mountain-climbing equipment.^[3] The 7068 aluminum is used to make the outer encasing of a number of smartphones, notably the recent ones in the iPhone series.

Standard specifications

Standard specifications for AL 7068 include:^[4]

AMS 4331
MMPDS-12
AMS 2772

References

1. ^{{Cite web |url=http://www.kaiseraluminum.com/wp-content/themes/kac/files/alloy-7068-brochure.pdf |title=Kaiser Aluminium Alloy 7068 |access-date=2015-01-12 |archive-url=https://web.archive.org/web/20141021072026/http://www.kaiseraluminum.com/wp-content/themes/kac/files/alloy-7068-brochure.pdf |archive-date=2014-10-21 |dead-url=yes |df= }}
2. ^MMPDS
3. ^{{cite web|url=http://www.smithshp.com/downloads/7068_SHP.pdf|title=7068 Aluminium Alloy Technical Datasheet |website=Smiths High Performance}}
4. ^{{cite web|title=Specifications|url=http://www.kaiseraluminum.com/wp-content/themes/kac/files/alloy-7068-brochure.pdf|website=Kaiser Aluminum|access-date=2015-01-12|archive-url=https://web.archive.org/web/20141021072026/http://www.kaiseraluminum.com/wp-content/themes/kac/files/alloy-7068-brochure.pdf|archive-date=2014-10-21|dead-url=yes|df=}}

1 : Aluminium alloys

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