High mechanical strength magnesium alloys and process for obtaining these alloys by rapid solidification
AssigneesPechiney Electrometallurgie, Norsk Hydro a.s.
InventorsGilles Regazzoni, Gilles Nussbaum, Haavard T. Gjestland
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Abstract
Magnesium alloy having a breaking load of at least 290 MPa, more particularly at least 330 MPa, having the following composition by weight: Al 2-11%, Zn 0-12%, Mn 0-0.6%, Ca 0-7%, but with the presence of at least Zn and/or Ca, having a mean particle size less than 3 .mu.m, a homogeneous matrix reinforced with intermetallic compounds having a size less than 1 .mu.m precipitated at the grain boundaries, this structure remaining unchanged after storage at 200.degree. C. for 24 hours; and a process for producing it by rapid solidification and consolidation by extrusion at a temperature between 200.degree. and 350.degree. C.
Claims13
A magnesium-based alloy having a breaking load at least equal to 290 MPa and an elongation at break at least equal to 5%, said alloy consisting essentially of, by weight;
- ______________________________________ aluminum 2-11%;
- manganese 0.1-0.6%;
- calcium 0-7%;
- zinc 0.2-12%;
- the principal impurities silicon 0.1-0.6%;
- copper 0-0.2%;
- iron 0-0.1%;
- nickel 0-0.01%;
- and the remainder magnesium;
- ______________________________________
- said alloy having a mean particle size of less than 3 .mu.m, and comprising a homogeneous matrix reinforced with particles of the intermetallic compound Mg.sub.17 Al.sub.12, and optionally, at least one of the compounds Mg.sub.32 (Al, Zn).sub.49 and Al.sub.2 Ca, of a mean size less than 1 .mu.m precipitated at the grain boundaries, the alloy structure remaining unchanged after storage for 24 hours at 200.degree. C.
A magnesium-based alloy having a breaking load at least equal to 290 MPa and an elongation at break at least equal to 5%, said alloy consisting essentially of, by weight:
- ______________________________________ aluminum 2-11%;
- manganese 0-0.6%;
- calcium 0.5-7%;
- zinc 0-12%;
- the principal impurities silicon 0.1-0.6%;
- copper 0-0.2%;
- iron 0-0.1%;
- nickel 0-0.01%;
- and the remainder magnesium;
- ______________________________________
- said alloy having a mean particle size of less than 3 .mu.m, and comprising a homogeneous matrix reinforced with particles of the intermetallic compound Mg.sub.17 Al.sub.12, and optionally, at least one of the compounds Mg.sub.32 (Al,Zn).sub.49 and Al.sub.2 Ca, of a mean size less than 1 .mu.m precipitated at the grain boundaries, the alloy structure remaining unchanged after storage for 24 hours at 200.degree. C.
Dependencies are inferred from the claim text.