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Exam (elaborations)

MMET 207 Exam 3 with Complete Solutions

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MMET 207 Exam 3 with Complete Solutions

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  • November 12, 2024
  • 18
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
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MMET 207 Exam 3 with Complete
Solutions
2000 Correct Ans--copper is major alloying element

-copper gives strength

-heat treatable

-not good food corrosion resistance

-artificial/furnace aging (T6)

-heat treated condition: mechanical properties close or even exceed mild steel

-2024 is best known alloy



3000 Correct Ans--Manganese is major alloying element

-non-heat treatable

-good strength

-limited: won't absorb > 1.5% Mn

-good workability

-3003 - general purpose alloy



4000 Correct Ans--Silicon is major alloying element

-dark gray when anodizing

-Si lowers melting point without causing brittleness

-used in welding wire and brazing alloys

,-non-heat treatable



5000 Correct Ans--magnesium is major alloying element

-good weld characteristics

-problems with stress corrosion cracking at higher temperatures

-resistance to marine atmosphere corrosion

-most effective and widely used alloy

-non-heat treatable

-moderate to high strength



6000 Correct Ans--magnesium and silicon are major alloying elements

-forms magnesium silicide

-not as strong as 2000 or 7000

-corrosion resistance

-6061 most used (T6)

-heat treatable

-good formability



7000 Correct Ans-Zinc is major alloying element

-Heat treatable

-high strength

-no arc weld- tends to crack

, -lighter and stronger (aircraft)



heat treatable aluminum series Correct Ans-2000s 6000s 7000s




non-heat treatable aluminum series Correct Ans-1000s 3000s 4000s 5000s

-cannot make harder

-can try using cold work (strain hardening)



Suffix XXXX - HXX Correct Ans-H- deals with strain hardening

H1X-strain hardened only

H2X-strain hardened and partially annealed

H3X-strain hardened and stabilized by low-temp. thermal treatments

-the second number represents the degree of strain hardening: X/8 (out of 8)

HX1-least hard

HX8-max hard



precipitation hardening Correct Ans--no phase change

-limited solubility

-heated, water quenched then aged



aging Correct Ans--develops precipitates

-heat makes it faster

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