Aluminum alloy excellent in cutting ability, aluminum alloy materials and manufacturing method thereof

An aluminum alloy, comprising:

• Mg:
• 0.3-6 mass %;
• Si:
• 0.3-10 mass %;
• Zn:
• 0.05-1 mass %;
• Sr:
• 0.001-0.3 mass %;
• one or more of selective additional elements selected from the group consisting of Cu:
• 0.01 mass % or more but less than 1 mass %, Fe:
• 0.01-1 mass %, Mn:
• 0.01-1 mass %, Cr:
• 0.01-1 mass %, Zr:
• 0.01-1 mass %, Ti:
• 0.01-1 mass %, Na:
• 0.001-0.5 mass % and Ca:
• 0.001-0.5 mass %;
• and
• the balance being Aluminum and impurities.

An aluminum alloy material composed of an aluminum alloy,

• wherein the aluminum alloy comprises
• Mg:
• 0.3-6 mass %,
• Si:
• 0.3-10 mass %,
• Zn:
• 0.05-1 mass %,
• Sr:
• 0.001-0.3 mass %, and
• the balance being aluminum and impurities, as a chemical composition thereof, and
• wherein a mean particle diameter of Si particle is 1-5 μm and a mean aspect ratio of Si particle is 1-3, as an alloy texture of the aluminum alloy.

An aluminum alloy material composed of aluminum alloy,

• wherein the aluminum alloy comprises
• Mg:
• 0.3-6 mass %,
• Si:
• 0.3-10 mass %,
• Zn:
• 0.05-1 mass %,
• Sr:
• 0.001-0.3 mass %,
• one or more selective additional elements selected from the group consisting of Cu:
• 0.01 mass % or more but less than 1 mass %, Fe:
• 0.01-1 mass %, Mn:
• 0.01-1 mass %, Cr:
• 0.01-1 mass %, Zr:
• 0.01-1 mass %, Ti:
• 0.01-1 mass %, Na:
• 0.001-0.5 mass % and Ca:
• 0.001-0.5 mass %, as a chemical composition thereof, and
• the balance being aluminum and impurities, and
• wherein a mean particle diameter of Si particle is 1-5 μm and a mean aspect ratio of Si particle is 1-3, as an alloy texture of the aluminum alloy.

A method for manufacturing an aluminum alloy material, the method comprising:

• making a billet at a casting rate of 10-180 mm/min., the billet composed of aluminum alloy comprising Mg:
• 0.3-6 mass %, Si:
• 0.3-10 mass %, Zn:
• 0.05-1 mass %, Sr:
• 0.001-0.3 mass %, and the balance being aluminum and impurities;
• homogenizing the billet at 400-570° C. for 6 hours or more to obtain a homogenized billet;
• extruding the homogenized billet at a billet temperature of 300-550° C., an extrusion rate of 0.5-100 m/min. and an extrusion ratio of 10-200 into an extruded article having a predetermined configuration;
• executing a solution treatment to the extruded article at 400-570° C. for 1 hour or more;
• and
• aging the solution treated extruded article at 90-300° C. for 1-30 hours.

A method for manufacturing an aluminum alloy material, comprising:

• making a billet at a casting rate of 10-180 mm/min., the billet composed of aluminum alloy comprising Mg:
• 0.3-6 mass %, Si:
• 0.3-10 mass %, Zn:
• 0.05-1 mass %, Sr:
• 0.001-0.3 mass %, one or more selective additional elements selected from the group consisting of Cu:
• 0.01 mass % or more but less than 1 mass %, Fe:
• 0.01-1 mass %, Mn:
• 0.01-1 mass %, Cr:
• 0.01-1 mass %, Zr:
• 0.01-1 mass %, Ti:
• 0.01-1 mass %, Na:
• 0.001-0.5 mass % and Ca:
• 0.001-0.5 mass %, and the balance being aluminum and impurities;
• homogenizing the billet at 400-570° C. for 6 hours or more to obtain a homogenized billet;
• extruding the homogenized billet at a billet temperature of 300-550° C., an extrusion rate of 0.5-100 m/min., and an extrusion ratio of 10-200 into an extruded article having a predetermined configuration;
• executing a solution treatment to the extruded article at 400-570° C. for 1 hour or more;
• and
• aging the solution treated extruded article at 90-300° C. for 1-30 hours.

An aluminum alloy, comprising:

• Mg:
• 0.1-6 mass %;
• Si:
• 0.3-12.5 mass %;
• Cu:
• 0.01 mass % or more but less than 1 mass %;
• Zn:
• 0.01-3 mass %;
• Sr:
• 0.001-0.5 mass %;
• and
• the balance being aluminum and impurities.

An aluminum alloy, comprising:

• Mg:
• 0.1-6 mass %;
• Si:
• 0.3-12.5 mass %;
• Cu:
• 0.01 mass % or more but less than 1 mass %;
• Zn:
• 0.01-3 mass %;
• Sr:
• 0.001-0.5 mass %;
• one or more of selective additional elements selected from the group consisting of Ti:
• 0.001-1 mass %, B:
• 0.0001-0.03 mass %, C:
• 0.0001-0.5 mass %, Fe:
• 0.01-1 mass %, Cr:
• 0.01-1 mass %, Mn:
• 0.01-1 mass %;
• Zr:
• 0.01-1 mass %, V:
• 0.01-1 mass %, Sc:
• 0.0001-0.5 mass %, Ni:
• 0.005-1 mass %, Na:
• 0.001-0.5 mass %, Sb:
• 0.001-0.5 mass %, Ca:
• 0.001-0.5 mass %, Sn:
• 0.01-1 mass %, Bi:
• 0.01-1 mass %, and In:
• 0.001-0.5 mass %;
• and
• the balance being Aluminum and impurities.

An aluminum alloy material composed of aluminum alloy,

• wherein the aluminum alloy comprises Mg:
• 0.1-6 mass %, Si:
• 0.3-12.5 mass %, Cu:
• 0.01 mass % or more but less than 1 mass %, Zn:
• 0.01-3 mass %, Sr:
• 0.001-0.5 mass %, and the balance being aluminum and impurities,
• wherein, in a metal texture, a mean dendrite arm spacing is 1-200 μm, a dendrite boundary zone includes eutectic Si particles of 0.01-5 μm of a mean particle diameter and other second phase particles, and an eutectic lamella texture in which a mean skeleton line length (Lm) in a longitudinal direction is 0.5 μm or more and a mean width (Wm) is 0.5 μm or more is formed in a shape of a network.

An aluminum alloy material composed of an aluminum alloy,

• wherein the aluminum alloy comprises
• Mg:
• 0.1-6 mass %;
• Si:
• 0.3-12.5 mass %;
• Cu:
• 0.01 mass % or more but less than 1 mass %;
• Zn:
• 0.01-3 mass %;
• Sr:
• 0.001-0.5 mass %;
• one or more of selective additional elements selected from the group consisting of Ti:
• 0.001-1 mass %, B:
• 0.0001-0.03 mass %, C:
• 0.0001-0.5 mass %, Fe:
• 0.01-1 mass %, Cr:
• 0.01-1 mass %, Mn:
• 0.01-1 mass %, Zr:
• 0.01-1 mass %, V:
• 0.01-1 mass %, Sc:
• 0.0001-0.5 mass %, Ni:
• 0.005-1 mass %, Na:
• 0.001-0.5 mass %, Sb:
• 0.001-0.5 mass %, Ca:
• 0.001-0.5 mass %, Sn:
• 0.01-1 mass %, Bi:
• 0.01-1 mass %, and In:
• 0.001-0.5 mass %;
• and
• the balance being Aluminum and impurities, and
• wherein, in a metal texture, a mean dendrite arm spacing is 1-200 μm, a dendrite boundary zone includes eutectic Si particles of 0.01-5 μm of mean particle diameters and other second phase particles, and an eutectic lamella texture in which a mean skeleton line length (Lm) in a longitudinal direction is 0.5 μm or more and a mean width (Wm) is 0.5 μm or more is formed in a shape of a network.

A method for manufacturing an aluminum alloy material, the method comprising:

• continuously casting molten aluminum alloy to obtain a shape member having a prescribed cross section at a casting rate of 30-5000 mm/min. and a cooling rate of 10-600° C./sec., the molten aluminum alloy comprising Mg:
• 0.1-6 mass %, Si:
• 0.3-12.5 mass %, Cu:
• 0.01 mass % or more but less than 1 mass %, Zn:
• 0.01-3 mass %, Sr:
• 0.001-0.5 mass % and the balance being aluminum and impurities and held at the solidus temperature or more;
• thereafter
• aging the shape member at 100-300° C. for 0.5-100 hours.

A method for manufacturing an aluminum alloy material, the method comprising:

• continuously casting molten aluminum alloy to obtain a shape member having a prescribed cross section at a casting rate of 30-5,000 mm/min. and a cooling rate of 10-600° C./sec., the molten aluminum alloy comprising Mg:
• 0.1-6 mass %, Si:
• 0.3-12.5 mass %, Cu:
• 0.01 mass % or more but less than 1 mass %, Zn:
• 0.01-3 mass %, Sr:
• 0.001-0.5 mass %, one or more of selective additional elements selected from the group consisting of Ti:
• 0.001-1 mass %, B:
• 0.0001-0.03 mass %, C:
• 0.0001-0.5 mass %, Fe:
• 0.01-1 mass %;
• Cr:
• 0.01-1 mass %, Mn:
• 0.01-1 mass %, Zr:
• 0.01-1 mass %, V:
• 0.01-1 mass %, Sc:
• 0.0001-0.5 mass %, Ni:
• 0.005-1 mass %, Na:
• 0.001-0.5 mass %, Sb:
• 0.001-0.5 mass %, Ca:
• 0.001-0.5 mass %, Sn:
• 0.01-1 mass %, Bi:
• 0.01-1 mass %, In:
• 0.001-0.5 mass %, and the balance being aluminum and impurities and held at the solidus temperature or more;
• thereafter
• aging the shape member at 100-300° C. for 0.5-100 hours.