May 17 2013
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.