Magnesium_Other_Light

Magnesium_Other_Light - Other Lightweight Metals(Mg Be Ti...

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Unformatted text preview: Other Lightweight Metals (Mg, Be, Ti) Magnesium & Magnesium Alloys: Assets: Lighter than aluminum (density is 1.74 g/cm 3 ) Strength/weight ratio is good Low melting point Good machining characteristics 5-20 times better than machining steel Good damping characteristics Thermal and electrical conductivity ~31% that of Copper ~½ that of Aluminum Magnesium: Limitations : Stiffness is ~4.5x lower than steel Wear Creep Fatigue Brittle Corrosion resistance generally poor YS str /YS weak ≈ 3 Highest thermal expansion of all engineering metals Comparison of Materials: Strength to weight ratio: (TS ksi/specific gravity) Steel (piano wire) 50 Titanium 40 Steel (Q&T med C) 32 Aluminum 7075-T6 25 Magnesium 25 Steel (hot rolled 1020) 7.5 Comparison con’t.: Maximum Tensile Strength Specific Gravity Mg 50 ksi Al 85 ksi Steel 300 ksi Mg 1.74 Al 2.7 Ti 4.5 Fe 7.8 Strengthening of Magnesium: 1. Grain size 2. Solid Solution 3. Cold Working – limited due to HCP structure 4. Dispersion Strengthening 5. Age Hardening – possible but additional increment is far less than for aluminum Designation System: Series of letters and numbers The letters designate the two largest alloying metals The numbers correspond to the rounded off whole number percentage of the two main alloy elements Example: AZ91 is 9% Al and 1% Zn AM100 is 10% Al and <1/2% Mn Suffixes (letters) denote variation of the same basic alloy Example: AZ91A Heat treat temper system is the same as for aluminum...
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This note was uploaded on 05/20/2008 for the course MET 121 taught by Professor Kohser during the Spring '07 term at Missouri S&T.

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Magnesium_Other_Light - Other Lightweight Metals(Mg Be Ti...

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