High-strength aluminum alloy and manufacturing method thereof
AssigneeUacj Corporation
InventorsHidenori Hatta, Satoshi Udagawa, Takero Watanabe
Life of this patent
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Abstract
An aluminum alloy contains, in mass percent, Zn: 2.5% or more and less than 5.0%, Mg: 2.2% or more and 3.0% or less, and Ti: 0.001% or more and 0.05% or less, Cu: 0.10% or less, Zr: 0.10% or less, Cr: 0.03% or less, Fe: 0.30% or less, Si: 0.30% or less, and Mn: 0.03% or less, the remainder being composed of Al and unavoidable impurities. In addition, the tensile strength is 380 MPa or more; the electrical conductivity is 38.0% IACS or more; and the metallographic structure is composed of a recrystallized structure.
Claims19
An aluminum alloy, comprising in mass percent:
- Zn:
- 2.5% or more and less than 5.0%,
- Mg:
- 2.2% or more and 3.0% or less,
- Ti:
- 0.001% or more and 0.05% or less,
- Cu:
- 0.10% or less,
- Zr:
- 0.10% or less,
- Cr:
- 0.03% or less,
- Fe:
- 0.30% or less,
- Si:
- 0.30% or less, and
- Mn:
- 0.03% or less,
- the remainder being composed of Al and unavoidable impurities,
- wherein the aluminum alloy has:
- a tensile strength of 380 MPa or more;
- an electrical conductivity of 38.0% IACS or more;
- and
- a metallographic structure composed of a recrystallized structure.
A process for producing a wrought aluminum alloy material, which comprises:
- preparing an ingot having a chemical composition comprising, in mass percent, Zn:
- 2. 5% or more and less than 5.0%, Mg:
- 2.2% or more and 3.0% or less, Ti:
- 0.001% or more and 0.05% or less, Cu:
- 0.10% or less, Zr:
- 0.10% or less, Cr:
- 0.03% or less, Fe:
- 0.30% or less, Si:
- 0. 30% or less, and Mn:
- 0.03% or less, the remainder being composed of Al and unavoidable impurities,
- performing a homogenization treatment that heats the ingot at a temperature of 540° C. or higher and 580° C. or lower for 1 hour to 24 hours;
- subsequently, forming a wrought material by performing hot working on the ingot in a state where the temperature of the ingot at the beginning of the working is 440° C. to 560° C.;
- while the wrought material is still at 400° C. or higher, starting to cool it and subsequently performing a quenching treatment such that, while the wrought material is cooling down from 400° C. to 150° C., the average cooling rate is 3° C./s or more and 300° C./s or less;
- cooling the temperature of the wrought material to room temperature by said quenching treatment or by an additional cooling treatment;
- and
- thereafter, performing an artificial aging treatment on the wrought material.
Dependencies are inferred from the claim text.