Elektron® RZ5 is a proven magnesium casting alloy containing zinc, rare earths and zirconium. Used in the T5 condition, this high strength magnesium alloy is ideal for high integrity castings operating at ambient temperatures or up to 150˚C. In addition to displaying excellent casting characteristics, the alloy is both pressure tight and weldable.
The versatility of this alloy makes it of interest to a wide range of designers dealing with aerospace, automotive, military and electronic applications. Castings in Elektron® RZ5 are found in a wide range of applications including:
Optimum properties are achieved in the T5 condition after 2 hours at 330˚C followed by 10–16 hours at 170–180˚C. Water quenching is not required. Satisfactory properties may be obtained from 1–6 hours at 325–360˚C. Water quenching is not required.
Good. Castings will contain minimal microporosity and the tendency to hot cracking is low. Castings are pressure tight and may be welded.
Pattern makers shrinkage factor
Weldable by the tungsten arc inert gas process (TIG) with a filler rod of a similar composition. Castings should be heat treated after welding.
Elektron® RZ5 castings, like all magnesium alloy castings, machine faster than any other metal. Providing the geometry of the part allows, the limiting factor is the power and speed of the machine rather than the quality of the tool material. The power required per cubic centimetre of metal removed varies from 9 to 14 watts per minute depending on the operation.
All the normal chromating, anodising and finishing treatments are applicable.
ASTM B117 Salt spray test
Corrosion rate: 4–6mg/cm2/day
Low temperature properties
Mechanical properties at -196˚C:
Ultimate tensile strength: 245MPa
Impact value (unnotched): 0.7j