Basic Information

What is Magnesium?

For its lightness and recyclability, magnesium is expected to replace plastics, aluminum and steel.
Magnesium, its atomic number is 12, is the lightest among the metals for structural application.
Magnesium itself has been discovered about 100 years ago. However, its application was limited mainly due to its weak corrosion resistance and high cost.
But, magnesium has been re-discovered recently thanks to the development of the corrosion resistant alloys and the price down of the raw material produced in various cities including China.
Above all, Thixomolding™  has succeeded to widen the applications using magnesium.
Thixomolding™ is the molding process which enables the safety operation and high quality Mg products.

Magnesium as Natural Resources

Magnesium is the eighth plentiful element in all of the consisting substance of the earth's crust.               
It is found in seawater, or as magnesite and dolomite ores in most countries. It can be considered that magnesium is virtually inexhaustible.

Element Chemical Symbol Content (mg/l)
SODIUM Na 10,500
MAGNESIUM Mg 1,300
ALUMINUM Al 0.01
SILICON Si 3
POTASSIUM K 380
CALCIUM Ca 400
IRON Fe 0.01
SILVER Ag 0.003

Alloy Name

Alloy name is defined according to ASTM that indicates the main alloying element and its amount.

Composition of Major Alloys (ASTM)

Alloy name Mg Al Zn Mn Si Cu Ni Fe
AZ91D bal. 8.5-9.5 0.45-0.90 0.17-0.4 ≦0.05 ≦0.025 ≦0.001 ≦0.004
AM60B bal. 5.6-6.4 ≦0.20 0.26-0.5 ≦0.05 ≦0.008 ≦0.001 ≦0.004
AM50A bal. 4.5-5.3 ≦0.20 0.28-0.5 ≦0.01 ≦0.008 ≦0.001 ≦0.004
AS41B bal. 3.7-4.8 ≦0.10 0.35-0.60 0.6-1.4 ≦0.015 ≦0.001 ≦0.0035

Features and Applications of Magnesium Alloys

Alloy name Feature Application
AZ91D High strength and good corrosion resistance Housings of electric appliances
AM60B Shock absorption with high ductility Steering wheel, seat frame
AM50A
AS41B Good creep characteristic Transmission housings