Castable magnesium alloys

Abstract

This invention relates to magnesium-based alloys particularly suitable for casting applications where good mechanical properties at room and at elevated temperatures are required. The alloys contain: 2 to 4.5% by weight of neodymium; 0.2 to 7.0 of at least one rare earth metal of atomic No. 62 to 71; up to 1.3% by weight of zinc; and 0.2 to 0.7% by weight of zirconium; optionally with one or more other minor component They are resistant to corrosion, show good age-hardening behaviour, and are also suitable for extrusion and wrought alloy applications.

Description

technical field [0001] The present invention relates to magnesium-based alloys particularly suitable for casting applications, which have good mechanical properties at room and elevated temperatures. Background technique [0002] Magnesium-based alloys are often used in aerospace applications due to their high strength and light weight, where components such as helicopter gearboxes and jet engine components are suitable for sand casting. Such aerospace alloys have been developed during the last 20 years in an attempt to obtain good corrosion resistance in such alloys without loss of strength at high temperatures such as up to 200°C. [0003] A particular area of ​​research is magnesium-based alloys, which contain one or more rare earth (RE) elements. For example, WO 96 / 24701 describes a magnesium alloy particularly suitable for high pressure die casting which contains 2% to 5% by weight of rare earth metals in combination with 0.1% to 2% of zinc. In this specification, "ra...

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Problems solved by technology

The presence of significant levels of yttrium tends to cause poor casting properties due to oxidation

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