７ｘｘｘシリーズアルミニウム合金製品

Title:

７ｘｘｘシリーズアルミニウム合金製品

Document Type and Number:

Japanese Patent JP7265629

Kind Code:

B2

Abstract:

The invention relates to a wrought 7xxx-series aluminium alloy product having a composition comprising, in wt. %., Zn 6.40 to 7.50, Mg 2.15 to 2.75, Cu 1.20 to 2.00, and wherein Cu+Mg<4.50, and wherein Mg<2.5+5/3(Cu−1.2), Fe up to 0.25, Si up to 0.25, and optionally one or more elements selected from the group consisting of: (Zr up to 0.3, Cr up to 0.3, Mn up to 0.45, Ti up to 0.25, Sc up to 0.5, Ag up to 0.5), the balance being aluminium and impurities, and having been aged to achieve a conventional tensile yield strength (in MPa) measured in the L-direction measured at quarter thickness of more than 485−0.12*(t−100) MPa (t being the thickness of the product in mm); a minimum life without failure due to stress corrosion cracking (SCC) measured in accordance with ASTM G47-98 of at least 30 days at a short transverse (ST) stress level of 170 MPa; and a minimum Kmax-dev value without crack deviation due to crack propagation testing in standard atmosphere at room temperature in accordance with ASTM E647-13e01 in L-S direction on CT samples of at least 40 MPa√m on average.

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Inventors:

Bürger, Achim
Kosla, Sunil
Krechel, Christian Gerhard
Spangel, Sabine Maria
Mayer, Philip

Application Number:

JP2021528963A

Publication Date:

April 26, 2023

Filing Date:

January 09, 2020

Export Citation:

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Assignee:

Novelis Koblenz GmbH

International Classes:

C22C21/10; C22F1/053

Domestic Patent References:

JP2011058047A
JP2012214905A

Foreign References:

EP0829552A1

Attorney, Agent or Firm:

Michiko Matsutani
Shikimi Masayuki

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