Process for obtaining magnesium alloys by spray deposition
AssigneePechiney Recherche
InventorsJean-Francois Faure, Gilles Nussbaum, Gilles Regazzoni
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Abstract
Process for economically obtaining a magnesium alloy having improved mechanical characteristics and in particular a breaking strength of at least 290 MPa and an elongation at break of at least 5%, by spraying and deposition in solid form to provide an ingot with the following weight composition: Al 2-9%; Zn 0-4%; Mn 0-1%; Ca 0.5-5%; RE 0-4% (rare earths); and, with the main impurities, the remainder being magnesium. The ingot undergoes a consolidation treatment by thermal deformation at between 200.degree. and 250.degree. C. The alloys obtained by the process are constituted by a homogeneous magnesium matrix with the grain size between 3 and 25 .mu.m and particles of intermetallic compounds.
Claims17
Process for obtaining a magnesium alloy having improved mechanical characteristics, including a breaking load of at least 290 MPa and an elongation at break of at least 5%, comprising spray depositing to form an ingot having a composition, by weight:
- Al:
- 2-9%;
- Zn:
- 0-4%;
- Mn:
- 0-1%,
- Ca:
- 0.5-5%, and
- rare earths:
- 0-4%;
- with the following main impurity contents:
- Si<0.6%,
- Cu<0.2%,
- Fe<0.1%,
- Ni<0.01%:
- the remainder being magnesium, the cooling rate of said spray depositing being between 10 and 10.sup.3 .degree. K./sec, and consolidating said ingot by thermal deformation at between 200.degree. and 350.degree. C.
Dependencies are inferred from the claim text.