7068 aluminium alloy

7068 aluminium alloy is one of the strongest commercially available aluminium alloys, with a tensile strength comparable to that of some steels. This material, also known as an aircraft alloy, is heat treatable.[1]

7068-T6511 has typical ultimate tensile strength of 710 MPa (103 ksi) versus a similar product produced from 7075-T6511 that would have a typical ultimate tensile strength of 640 MPa (93 ksi). Typical yield strength for alloy 7068-T6511 is 683 MPa (99.1 ksi) versus 590 MPa (86 ksi) for a similar product produced from 7075-T6511.[2] Strength allowables for this alloy are provided in Metallic Materials Properties Development and Standardization for design.[3]

The main alloying elements are zinc (7.3 to 8.3%), magnesium (2.2 to 3.0%), copper (1.6 to 2.4%) and zirconium (0.05 to 0.15%), with traces of silicon, iron, manganese, chromium, and titanium.[4]

Chemical composition

Element[4] Weight percentage (%)
Aluminum, Al 85.43
Zinc, Zn 8.3
Magnesium, Mg 3
Copper, Cu 2.4
Iron, Fe 0.15
Zirconium, Zr 0.15
Silicon, Si 0.12
Manganese, Mn 0.1
Titanium, Ti 0.1
Chromium, Cr 0.05
Other (each) 0.05
Other (total) 0.15

Physical properties

Properties[4] Metric
Density 2.85 g/cm3
Melting point 476–635 °C

Mechanical properties

Properties[4] Metric
Tensile strength 641 MPa
Yield strength 590 MPa
Elongation 8%

Thermal Properties

Properties[4] Metric
Thermal conductivity 190 W/mK

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.

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.[5]

Application

Applications of this alloy include: Connecting rods, Shock absorbers, Fuel pumps, Rocker arms, Bearing caps, Prosthetics, Chain tensioners. [6]

Standard specifications

Standard specifications for AL 7068 include:[7]

  • AMS 4331
  • AMS 2772

References

  1. ^ "Air craft alloy". Archived from the original on 2020-08-12.
  2. ^ "Kaiser Aluminium Alloy 7068" (PDF). Archived from the original (PDF) on 2014-10-21. Retrieved 2015-01-12.
  3. ^ MMPDS
  4. ^ a b c d e "Aluminum 7068 Alloy properties". 8 May 2013. Archived from the original on 2015-10-28.
  5. ^ "7068 Aluminium Alloy Technical Datasheet" (PDF). Smiths High Performance.
  6. ^ "Applications of 7068 aluminum alloy". Archived from the original on 2021-01-08.
  7. ^ "Specifications" (PDF). Kaiser Aluminum. Archived from the original (PDF) on 2014-10-21. Retrieved 2015-01-12.

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