Originally Posted by http://www.substech.com/dokuwiki/doku.php?id=wrought_magnesium_alloys
Wrought Magnesium-Zinc-Zirconium-Thorium Alloys (ZK10A, ZK20A, ZK60A, HM13A, HM31A) are heat-treatable high strength alloys.
Zirconium is added to the alloys for refining Grain structure .
Zinc increases the strength of the alloys.
Wrought magnesium-zinc-zirconium-thorium alloys have very high mechanical strength combined with poor weldability and workability even in hot state.
The alloys are used for manufacturing high strength forged and extruded parts, bicycle frames, road wheels, helicopters gears, parts of satellites.
