Aluminum 8090 Alloy (UNS A98090)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Applications

Introduction

Aluminium / aluminum is a soft and lightweight metal. It can be alloyed with elements such as manganese, magnesium, silicon, copper and lithium. Aluminium / aluminum manufacturers began creating aluminium / aluminum -lithium alloys in the 1970s.

Aluminium / aluminum 8090 alloy is a lithium-based wrought alloy. Addition of lithium to aluminum helps to reduce density and increase stiffness. When properly alloyed, aluminum- lithium alloys can have excellent combinations of strength and toughness.

The following datasheet will provide more details about aluminium / aluminum 8090 alloy.

Chemical Composition

The following table shows the chemical composition of aluminium / aluminum 8090-T8151 alloy.

Element Content (%)
Aluminum, Al 93 - 96.2
Lithium, Li 2.2 - 2.7
Copper, Cu 1- 1.6
Magnesium, Mg 0.60 - 1.3
Iron, Fe ≤ 0.30
Zinc, Zn ≤ 0.25
Silicon, Si ≤ 0.20
Titanium, Ti ≤ 0.10
Chromium, Cr ≤ 0.10
Manganese, Mn ≤ 0.10
Zirconium, Zr 0.040 - 0.16
Other (each) ≤ 0.050
Other (total) ≤ 0.15

Physical Properties

The physical properties of aluminium / aluminum 8090-T8151 alloy are outlined in the following table.

Properties Metric Imperial
Density 2.54 g/cm³ 0.0918 lb/in³
Melting point 600 - 655°C 1110 - 1210°F

Mechanical Properties

The mechanical properties of aluminium / aluminum 8090-T8151 alloy are tabulated below.

Properties Metric Imperial
Tensile strength 450 MPa 65300 psi
Yield strength 370 MPa 53700 psi
Elongation at break 7% 7%
Elastic modulus 77 GPa 11200 ksi
Shear strength 270 MPa 39200 psi
Hardness, Brinell (@load 500 kg; thickness 10.0 mm) 121 121
Hardness, Knoop (converted from Brinell hardness value) 151 151
Hardness, Rockwell A (converted from Brinell hardness value) 47.2 47.2
Hardness, Rockwell B (converted from Brinell hardness value) 75 75
Hardness, Vickers (converted from Brinell hardness value) 137 137

Thermal Properties

The thermal properties of aluminium / aluminum 8090-T8151 alloy are tabulated below.

Properties Metric Imperial
Thermal expansion co-efficient (@20-100°C/68-212°F) 21.4 µm/m°C 11.9 µin/in°F
Thermal conductivity 95.3 W/mK 661 BTU in/hr.ft².°F

Applications

Aluminium / aluminum 8090 alloy is chiefly used as advanced materials for aerospace technology and to minimize the weight of army weaponry and defense systems.

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