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Aluminum & Alloys (MMET 207)- Questions & Answers
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Aluminum & Alloys (MMET 207)- Questions & Answers
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Aluminum & Alloys (MMET 207)-Questions & Answers
Which is the strongest series of Aluminum Alloys? Correct Ans-7000
Range of strengths of heat treatable alloys Correct Ans-6000 < 2000 < 7000
Why is 7000 series the strongest? Correct Ans-Zinc is very soluble, therefore, it has the
capacity to make more precipitants.
Range of strengths of non-heat treatable alloys Correct Ans-1000 < 3000 < 4000 < 5000
Length of Natural Aging Correct Ans-Approximately 3 weeks
Length and temp of Furnace Aging Correct Ans-Approximately 21 hours at 200-400 F
1000 Series Correct Ans-- Most Pure
- Used in heavy chemical exposure
- Good atmospheric corrosion resistance
- Very soft and ductile
2000 Series Correct Ans-- Alloyed with Copper (Cu)
, - Heat treated has similar strength to low carbon steel (<0.3% carbon)
- Commonly artificially (furnace) aged to take full advantage of properties
- Worse conductivity than pure Al
- Worse corrosion resistance
- Often overlayed/cladded with 6000 or 1000 series
3000 Series Correct Ans-- Alloyed with Manganese (Mn)
- Limited to 1.5% Mn
- X003 - general purpose Al alloy
- Moderate Strength
4000 Series Correct Ans-- Alloyed with Silicon (Si)
- Si helps with weld flow and molten flow
- Can be slightly hardened when diluted with heat treatable alloys
- Turns dark gray when anodized (can't really be dyed)
5000 Series Correct Ans-- Alloyed with Magnesium (Mg)
- Good welding characteristics
- Resistant to marine atmospheric corrosion
- Prone to stress corrosion cracking at high temps (BAD)
6000 Series Correct Ans-- Alloyed with Magnesium (Mg) & Silicone (Si)
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