Magnesium base alloy wire and method for production thereof
AssigneesSumitomo Electric Industries, Ltd., Sumitomo (SEI) Steel Wire Corp.
InventorsYukihiro Oishi, Nozomu Kawabe
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Abstract
Magnesium-based alloy wire excelling in strength and toughness, its method of manufacture, and springs in which the magnesium-based alloy wire is utilized are made available. The magnesium-based alloy wire contains, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, and is provided with the following constitution. Diameter d that is 0.1 mm or more and 10.0 mm or less; length L that is 1000 d or more; tensile strength that is 250 MPa or more; necking-down rate that is 15% or more; and elongation that is 6% or more. Such wire is produced by draw-forming it at a working temperature of 50° C. or more, and by heating it to a temperature of 100° C. or more and 300° C. or less after the drawing process has been performed.
Claims66
Magnesium-based alloy wire containing, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, the magnesium-based alloy wire characterized in that:
- its diameter d is 0.1 mm or more and 10.0 mm or less;
- its length L is 1000 d or more;
- its tensile strength is 250 MPa or more;
- its necking-down rate is 15% or more;
- and
- its elongation is 6% or more.
Magnesium-based alloy wire containing, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, the magnesium-based alloy wire characterized in that:
- its diameter d is 1.0 to 10.0 mm, and
- its length L is 1000 d or more;
- and in that
- its fatigue strength when a repeat push-pull stress amplitude is applied 1×107 times is 105 MPa or more.
Magnesium-based alloy wire containing, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, the magnesium-based alloy wire characterized in that:
- its YP ratio is 0.75 or more.
Magnesium-based alloy wire containing, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, the magnesium-based alloy wire characterized in that:
- the ratio τ0.2/τmax of its 0.2% offset strength τ0.2 to its maximum shear stress τmax in a torsion test is 0.50 or more.
Magnesium-based alloy wire containing, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, the magnesium-based alloy wire characterized in that:
- the crystal grain size of the alloy composing the wire is 10 μm or less.
Magnesium-based alloy wire containing, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, the magnesium-based alloy wire characterized in that:
- the crystal grains of the alloy composing the wire are sized in fine crystal grains and coarse crystal grains in a mixed-grain structure.
Magnesium-based alloy wire containing, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, the magnesium-based alloy wire characterized in that:
- the surface roughness of the wire superficially is Rz≦10 μm.
Magnesium-based alloy wire containing, in mass %, 0.1 to 12.0% Al, and 0.1 to 1.0% Mn, the magnesium-based alloy wire characterized in that:
- the axial residual stress superficially in the wire is 80 MPa or less.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- its diameter d is 0.1 mm or more and 10.0 mm or less;
- its length L is 1000 d or more;
- its tensile strength is 300 MPa or more;
- its necking-down rate is 15% or more;
- and
- its elongation is 6% or more.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- its diameter d is 1.0 to 10.0 mm, and
- its length L is 1000 d or more;
- and in that
- its fatigue strength when a repeat push-pull stress amplitude is applied 1×107 times is 105 MPa or more.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- the crystal grain size of the alloy composing the wire is 10 μm or less.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- the crystal grains of the alloy composing the wire are sized in fine crystal grains and coarse crystal grains in a mixed-grain structure.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- the surface roughness of the wire superficially is Rz≦10 μm.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- the axial residual stress superficially in the wire is 80 MPa or less.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- its YP ratio is 0.90 or more.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- its YP ratio is 0.75 or more and less than 0.90.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- the ratio τ0.2/τmax of its 0.2% offset strength τ0.2 to its maximum shear stress τmax in a torsion test is 0.60 or more.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr, the magnesium-based alloy wire characterized in that:
- the ratio τ0.2/τmax of its 0.2% offset strength τ0.2 to its maximum shear stress τmax in a torsion test is 0.50 or more and less than 0.60.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 1.0 to 3.0% rare earth element(s), the magnesium-based alloy wire characterized in that:
- its diameter d is 0.1 mm or more and 10.0 mm or less;
- its length L is 1000 d or more;
- its tensile strength is 220 MPa or more;
- its necking-down rate is 15% or more;
- and
- its elongation is 6% or more.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 1.0 to 3.0% rare earth element(s), the magnesium-based alloy wire characterized in that:
- the crystal grain size of the alloy composing the wire is 10 μm or less.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 1.0 to 3.0% rare earth element(s), the magnesium-based alloy wire characterized in that:
- the surface roughness of the wire superficially is Rz≦10 μm.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 1.0 to 3.0% rare earth element(s), the magnesium-based alloy wire characterized in that:
- the axial residual stress superficially in the wire is 80 MPa or less.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 1.0 to 3.0% rare earth element(s), the magnesium-based alloy wire characterized in that:
- its YP ratio is 0.90 or more.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 1.0 to 3.0% rare earth element(s), the magnesium-based alloy wire characterized in that:
- its YP ratio is 0.75 or more and less than 0.90.
Magnesium-based alloy wire containing, in mass %, 1.0 to 10.0% Zn, and 1.0 to 3.0% rare earth element(s), the magnesium-based alloy wire characterized in that:
- its 0.2% offset strength τ0.2 in a torsion test is 165 MPa or more.
A method of manufacturing magnesium-based alloy wire, characterized in being provided with:
- a step of preparing, as a raw-material parent metal, a magnesium-based alloy composed of any of the chemical components in (A) through (E) below:
- (A) magnesium-based alloy parent metals containing, in mass %:
- 0.1 to 12.0% Al, and 0.1 to 1.0% Mn;
- (B) magnesium-based alloy parent metals containing, in mass %:
- 0.1 to 12.0% Al, and 0.1 to 1.0% Mn;
- and furthermore containing one or more elements selected from 0.5 to 2.0% Zn, and 0.3 to 2.0% Si;
- (C) magnesium-based alloy parent metals containing, in mass %:
- 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr;
- (D) magnesium-based alloy parent metals containing, in mass %:
- 1.0 to 10.0% Zn, and 0.4 to 2.0% Zr;
- and furthermore containing 0.5 to 2.0% Mn;
- and
- (E) magnesium-based alloy parent metals containing, in mass %:
- 1.0 to 10.0% Zn, and 1.0 to 3.0% rare-earth element(s);
- and
- a processing step of drawing the raw-material parent metal to work it into wire form.
Dependencies are inferred from the claim text.