Lecture16 - ME 382 Lecture 16 17/ii/05 1 L IGHT A LLOYS ρ...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: ME 382 Lecture 16 17/ii/05 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 ME 382 Lecture 16 17/ii/05 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...
View Full Document

This note was uploaded on 01/26/2011 for the course ME 382 taught by Professor Garikipati during the Fall '08 term at University of Michigan.

Page1 / 6

Lecture16 - ME 382 Lecture 16 17/ii/05 1 L IGHT A LLOYS ρ...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online