Aluminum 7068 Alloy (UNS A97068)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations
Fabrication
Applications

Introduction

Aluminium / aluminum is a light-weight metal with a bright silvery luster. This metal along with its alloys are in high demand worldwide.

Aluminium / aluminum 7068 alloy is a heat treatable wrought alloy with good fatigue strength, good anodizing response, and high thermal conductivity. It was designed as a higher strength alternative to aluminium/aluminum 7075 for ordnance applications. It also provides the highest mechanical strength of all aluminium / aluminum alloys.

The following datasheet will provide more details about aluminium / aluminum 7068 alloy.

Chemical Composition

The following table shows the chemical composition of aluminium / aluminum 7068 alloy.

Element Content (%)
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
Aluminum, Al Remainder

Physical Properties

The physical properties of aluminium / aluminum 7068 alloy are outlined in the following table.

Properties Metric Imperial
Density 2.85 mg/cm³ 0.103 lb/in³
Melting point 476-635 ºC 890-1175 ºF

Mechanical Properties

The mechanical properties of aluminium / aluminum 7068 alloy are tabulated below.

Properties Metric Imperial
Tensile strength 641 MPa 93 ksi
Yield strength 590 MPa 85.7 ksi
Elongation 8% 8%

Thermal Properties

The thermal properties of aluminium / aluminum 7068 alloy are tabulated below.

Properties Metric Imperial
Thermal conductivity 190 W/mK 1317 BTU in/hr.ft².°F

Other Designations

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Equivalent materials to aluminium / aluminum 7068 alloys are listed below:

  • AMS 4331
  • AMS 2772

Fabrication

The machinability of aluminium / aluminum 7068 alloy is good and matches that of aluminium / aluminum 7075 alloy; however welding should be performed with expert advice. Anodizing of this alloy is possible using all the traditional techniques. When performing hard anodizing, the surface becomes more abrasion resistant.

Applications

Aluminium / aluminum 7068 alloy is chiefly used in the following areas:

  • Connecting rods
  • Autosport gearbox actuators and wheel components
  • Prosthetic limbs
  • Load cells
  • Hydraulic valve components
  • High pressure solenoids
  • Flexible shaft coupling
  • Snowmobile engine shafts
  • Automobile shock absorbers
  • Fuel pumps for racing engines
  • Motorcycle gears
  • Recreational products such as tents, ski and backpack rods, bicycles and mountain climbing equipment
  • Automotive valve body and connecting rod

Comments

  1. madhusudhan m madhusudhan m India says:

    i would like to know more about AA 7068

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