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US 7,922,967 B2Granted
High-strength and high-toughness magnesium based alloy, driving system part using the same and manufacturing method of high-strength and high-toughness magnesium based alloy material
AssigneeToudai TLD, Ltd.
InventorKatsuyoshi Kondoh
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Abstract
A high-strength and high-toughness magnesium based alloy contains, by weight, 1 to 8% rare earth element and 1 to 6% calcium and the maximum crystal grain diameter of magnesium constituting a matrix is not more than 30 μm. At least one intermetallic compound (6) of rare earth element and calcium has a maximum grain diameter of 20 μm or less and it is dispersed in a crystal grain boundary (5) and a crystal grain (4) of magnesium of the matrix.
Claims5
A manufacturing method of a high-strength and high-toughness magnesium based alloy material comprising the steps of:
- manufacturing a magnesium alloy ingot by a casting method, the magnesium alloy ingot containing, by weight, 1 to 8% rare earth element and 1 to 6% calcium and dispersing an intermetallic compound containing at least one of the rare earth element and the calcium along a crystal grain boundary of a magnesium matrix;
- obtaining magnesium alloy powder from the magnesium alloy ingot through a machining process;
- performing a plastic forming process to the magnesium alloy powder for miniaturizing the magnesium crystal grain that constitutes the matrix and for grinding the intermetallic compound finely to disperse the intermetallic compound inside the magnesium crystal grain;
- manufacturing a powder solidified body from said miniaturized magnesium based alloy powder by compression molding;
- and
- providing the magnesium based alloy material by heating said powder solidified body and performing a warm extrusion process to it.
3 more elements
Dependencies are inferred from the claim text.