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公开(公告)号：US20240327955A1
公开(公告)日：2024-10-03
申请号：US18616441
申请日：2024-03-26
发明人： Yuuki HAMATAKA , Karin SHIBATA
摘要： A method of producing a high-intensity aluminum alloy extruded material excellent in resistance to stress corrosion cracking, the method comprising: preparing an Al—Zn—Mg-based aluminum alloy, subjecting the aluminum alloy to extrusion so that a temperature of an extruded material obtained immediately after the extrusion is 440° C. or more; allowing the extruded material to cool in an air at a cooling rate of less than 100° C./min until the temperature range of the extruded material reaches 300 to 400° C. from immediately after the extrusion for one minute to 3 minutes and 24 seconds; and then forced cooling the extruded material at a cooling rate of 100 to 2000° C./min until the temperature of the extruded material reaches 150° C. or less, followed by an aging treatment.
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2.发明公开公开(公告)号：US20230272514A1
公开(公告)日：2023-08-31
申请号：US18107801
申请日：2023-02-09
发明人： Yuuki HAMATAKA
摘要： A method for producing an extruded material includes: casting a billet at a casting speed of 60 mm/min or more using an alloy containing: 0.50 to 1.0% of Mg, 0.80 to 1.30% of Si, 0.10 to 0.60% of Mn, 0.05 to 0.35% of Fe, 0.35% by mass or less of Cu, less than 0.10% by mass of Cr, Zr, Zn respectively, 0.10% by mass or less of Ti, and the balance being aluminum, the alloy having 0.85 to 1.75% of stoichiometric Mg2S with 0.10 to 0.85% of excess Si, and 0.15 to 0.95% of Mn and Fe; homogenizing at 560 to 590° C. for 2 to 8 hours, cooling at 50° C./h or more; preheating at 400 to 550° C., extruding the billet into the extruded material, cooling the extruded material from 460 to 550° C. at an average rate of 350° C./min or more; and applying artificial aging.
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