Manufacture of high strength al-zn-mg aluminum-alloy forging material excellent in resistance to stress-corrosion cracking

Abstract

PURPOSE: To form H-section forging material excellent in resistance to stress cracking by extruding an Al alloy, consisting of specific composition and regulated in Fe content, into a round bar and providing rough forging and finish forging to the bar by stretching it in the extruding direction. CONSTITUTION: In an Al alloy containing in wt%, 4.5W8.5% Zn, 1.5W3.5% Mg, 0.8W2.6% Cu, and further ≥1 kinds among 0.05W1% Mn, 0.05W0.35% Cr, 0.03W 0.3% Zr, 0.03W0.25% V, 0.005W0.1% Ti, and the balance Al with inevitable impurities; Fe content in the Al alloy is regulated to ≤0.15%. This Al alloy material is formed by extrusion into a round bar for forging, and is stretched by forging in the extruding direction; then the bar is formed into a forging material having an H-section by rough and finish forgings while regulating the forgings to obtain a ≤1.0 true strain at the H-section part of forged material. COPYRIGHT: (C)1985,JPO&Japio

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Cited By (8)

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    EP-2987881-A4January 11, 2017Uacj Extrusion Corp, Kyb CorpUnderbracket for two-wheeled vehicle and three-wheeled vehicle, and production method for same
    EP-2987882-A4January 18, 2017Uacj Extrusion Corp, Kyb CorpUnderbracket for two-wheeled vehicle and three-wheeled vehicle, and production method for same
    JP-S63297180-ADecember 05, 1988Showa Aluminum CorpBicycle frame by adhesive structure
    US-4832758-AMay 23, 1989Aluminum Company Of AmericaProducing combined high strength and high corrosion resistance in Al-Zn-MG-CU alloys
    US-4863528-ASeptember 05, 1989Aluminum Company Of AmericaAluminum alloy product having improved combinations of strength and corrosion resistance properties and method for producing the same
    US-5221377-AJune 22, 1993Aluminum Company Of AmericaAluminum alloy product having improved combinations of properties
    US-5496426-AMarch 05, 1996Aluminum Company Of AmericaAluminum alloy product having good combinations of mechanical and corrosion resistance properties and formability and process for producing such product
    US-8157932-B2April 17, 2012Alcoa Inc.Al-Zn-Mg-Cu-Sc high strength alloy for aerospace and automotive castings