ME_435_-_Week_2_3_-_Aluminum_Alloys

ME_435_-_Week_2_3_-_Aluminum_Alloys - Aluminum Alloys...

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Aluminum Alloys: Production, Classification, and Properties (Chapter 26) R. Clemmer ME 435 Fall 2011
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2 References K. G. Budinski, “ 3 rd ed., Prentice-Hall, 1989 F.C. Campbell, “Elements of Metallurgy and Engineering Alloys,” ASM International, 2008 William F. Smith, “ Structure and Properties of Engineering Alloys ,” 2nd ed., McGraw-Hill Publishing Co., Toronto, 1993 ASM Metals Reference Book, 3 rd ed., ASM International, 1993
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3 Al Properties Al Production Refining Bauxite (Bayer Process) Smelting Aluminum (Hall-Heroult Process) Primary Fabrication Remelting and Casting Direct Chill Casting Product Formation
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4 Wrought Aluminum Alloys Classification Non-Heat Treatable Wrought Alloys Heat Treatable Wrought Alloys Cast Aluminum Alloys Classification Casting Processes Characteristics of Cast Al Alloys Aluminum Surface Treatments Aluminum Alloy Selection
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Aluminum Production (Chapter 26)
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6 Bayer Process ASM Metals Reference Book 3 rd ed. (National Geographic Society)
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7 Aluminum Smelting (Hall-Heroult Process) (Campbell)
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8 Direct Chill Casting (Campbell)
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9 Aluminum Products (2 Classes) Wrought Alloys: Includes sheets, foils, extrusions, wires, rods, etc. and may be classed according to whether it can be heat-treated or not Casting Alloys Formulated for good casting properties; fluidity and flow Are grouped according to the type of casting process they might be used for most often
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10 (Budinski)
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Wrought Alloys
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12 Classification of Wrought Alloys Uses a 4 digit system where the first digit indicates the principle alloying elements developed by the Aluminum Association A suffix code is used after these 4 digits to indicate how the alloy is heat treated 1xxx = Commercially pure Aluminum (99% min) 2xxx = Copper (majoring alloying element) 3xxx = Manganese 4xxx = Silicon 5xxx = Magnesium 6xxx = Magnesium and Silicon 7xxx = Zinc 8xxx = Other elements (e.g. lithium) 9xxx = Unused series
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13 Basic Temper Designations F – As fabricated. No control over the amount of strain hardening; no mechanical property limits O – Annealed and recrystallized. Temper with the lowest strength and highest ductility H – Strain-hardened W – Solution heat treated. Temper gives good formability but is unstable as alloys will naturally age with time T – Heat treated to produce stable tempers other than F or O
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14 Strain-Hardened Subdivisions H1 – Strain-hardened only. The degree of strain hardening is indicated by the second digit and varies from quarter- hard (H12) to full-hard (H18), which is produced with approximately 75% reduction in area. H2 –
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ME_435_-_Week_2_3_-_Aluminum_Alloys - Aluminum Alloys...

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