Magnesium AZ80 Alloy (UNS M11800)

Nov 12 2012

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations

Introduction

Magnesium is a silvery-white metal which is used as an alloy element for zinc, lead, aluminum, and other nonferrous alloys. Magnesium alloys are light weight and feature superior machinability and ease of casting. They are often anodized to enhance corrosion resistance. They are designated using the ASTM and SAE system in which the first part denotes the two main alloying elements in the alloy and the second part represents their percentages.

The following datasheet gives an overview of magnesium AZ80 alloy.

Chemical Composition

The chemical composition of magnesium AZ80 alloy is highlighted in the following table.

Element Content (%)
Magnesium, Mg 91
Aluminum, Al 7.80 - 9.20
Zinc, Zn 0.20 - 0.80
Manganese, Mn 0.12
Silicon, Si  0.10
Copper, Cu 0.050
Iron, Fe 0.0050
Nickel, Ni 0.0050

Physical Properties

The following table shows the physical properties of magnesium AZ80 alloy.

Properties Metric Imperial
Density 1.80 g/cm3 0.0650 lb/in³

Mechanical Properties

The mechanical properties of magnesium AZ80 alloy are outlined in the following table.

Properties Metric Imperial
Tensile strength 380 MPa 55100 psi
Yield strength (strain 0.200%) 275 MPa 39900 psi
Shear strength 165 MPa 23900 psi
Compressive yield strength (at 0.2% offset) 240 MPa 34800 psi
Shear modulus (typical for steel) 17 GPa 2470 ksi
Elastic modulus 44.8 GPa 6498 ksi
Poisson's ratio 0.35 0.35
Elongation at break (in 50 mm) 7% 7%
Hardness, Brinell (500 kg load, 10 mm ball) 82 82
Hardness, Knoop (estimated from Brinell) 106 106
Hardness, Rockwell A (estimated from Brinell) 35 35
Hardness, Rockwell B (estimated from Brinell) 50 50
Hardness, Vickers (estimated from Brinell) 93 93
Machinability (relative rating, 100 best) 100 100

Thermal Properties

The thermal properties of magnesium AZ80 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (0-100°C/32-212°F) 26 µm/m°C 14.4 µin/in°F
Thermal conductivity 76 W/mK 527 BTU in/hr.ft°F

Other Designations

Other designations that are equivalent to magnesium AZ80 alloy include:

  • ASTM A276
  • ASTM A580
  • ASTM A412

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