Lecture16-Notes - ME 382 Lecture 16 LIGHT ALLOYS Al alloys Mg alloys Ti alloys Steels kg/m3 2700 1740 4500 7900 E GPa 71 45 120 210 Y(MPa 25-600

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ME 382 Lecture 16 1 L IGHT A LLOYS ρ kg/m 3 E GPa σ Y (MPa) E / ρ MPa/(kgm -3 ) σ Y / ρ MPa/(kgm -3 ) Al alloys 2700 71 25-600 26 0.0093-0.22 Mg alloys 1740 45 70-270 25 0.040-0.16 Ti alloys 4500 120 170-1280 27 0.038-0.28 Steels 7900 210 220-1600 27 0.028-0.20 For stiff-light beams maximize E 1/2 / ρ For strong-light beams maximize σ Y 2/3 / ρ (See ME577 - for details) This is where light alloys come into their own over steels E 1/2 / ρ (Pa) 1/2 /(kgm -3 ) σ Y 2/3 / ρ (Pa) 2/3 /(kgm -3 ) Al alloys 99 32-260 Mg alloys 120 98-240 Ti alloys 77 68-260 Steels 58 46-173 Light alloys are also corrosion resistant Designation of aluminum alloy of form 7075-T651 Aluminum alloys Major addition Minor additions Yield strength (MPa) 1xxx none none 25-125 2xxx 4% Cu Mg, Mn, Si 28-165 3xxx Mn Mg, Cu 4xxx Si none 5xxx Mg Mn, Cr 200-500 6xxx Mg, Si Cu, Mn 40-300 7xxx Zn Mg, Cu, Cr 350-600 Cast Al 11% Si 65-350 Specific examples: 2014 - 4.4% Cu, 0.5%Mg, 0.8% Mn, 0.8% Si 2024 - 4.4%Cu, 1,5% Mg, 0.6% Mn, 2219 - 6.3% Cu, 0.3%Mn
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ME 382 Lecture 16 2 Final code indicates processing (may be annealing, cold-work, or thermal treatment) HXX - indicates cold work TXX - indicates type of heat treatment Composition and processing dictate yield strength of alloy - must know both Strength of light alloys may come from Solid-solution hardening Age (precipitation) hardening Work hardening
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This note was uploaded on 09/08/2011 for the course MECHENG 382 taught by Professor Thouless during the Fall '08 term at University of Michigan.

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Lecture16-Notes - ME 382 Lecture 16 LIGHT ALLOYS Al alloys Mg alloys Ti alloys Steels kg/m3 2700 1740 4500 7900 E GPa 71 45 120 210 Y(MPa 25-600

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