Texas MMET 207 Assessment 3 Solved 100%
Correct
1000 Al - ANS-commercially pure aluminum (99% minimum)
2000 Al - ANS-copper
3000 Al - ANS-manganese
4000 Al - ANS-silicon
5000 Al - ANS-magnesium
6000 Al - ANS-magnesium and silicon
7000 Al - ANS-zinc
7000-F - ANS-zinc; as fabricated
4000-W - ANS-silicon; solution heat treated
3000-O - ANS-manganese; annealed
5000-H12 - ANS-magnesium; 1/4 strain hardened
3000-H18 - ANS-manganese; full strain harden
What Aluminum series are heat treatable? - ANS-2000, 6000, 7000
What aluminum series are not heat treatable? - ANS-1000, 3000, 4000, 5000
2000-T3 - ANS-copper; furnace solution heated, quenched and COLD WORKED
6000-T4 - ANS-magnesium and silicon; furnace solution heat treated, quenched
and NATURALLY AGED
7000-T6 - ANS-zinc; furnace solution heat treated, quenched and FURNACE AGED
What are the physical properties of aluminum compared to other metals? - ANS-
lighter than all other engineering metals, high thermal and electrical conductivity,
good corrosion resistance in atmospheric environment
Aluminum has how much of the conductivity of pure copper? - ANS-60%
Which has a higher conductivity per unit mass, aluminum or copper? - ANS-
aluminum
, How is precipitation hardening done? - ANS-temperature raised to about 800F,
water quenched and then aged
What does Fe do in aluminum? - ANS-increases the strength and hardness and
reduces hot-cracking in casting
What does Mn do in aluminum? - ANS-improves ductility and impact strength,
castability and reduces shrinkage
What does Si do in aluminum? - ANS-increases fluidity and corrosion resistance,
makes it difficult to machine
What does Mg do in aluminum? - ANS-improves strength, difficult to cast,
precipitation harden
What does Zn do in aluminum? - ANS-lowers castability, prone to hot cracking and
shrinkage, promotes high strength
What does Cu do in aluminum? - ANS-increases strength, can cause brittleness,
improves machinability
What is the annealing process for aluminums? - ANS-done on non-heat treatables
What is the stress relieving process for aluminums? - ANS-can be done on all alloys
to prevent stress corrosion cracking
What is the highest temperature heat treatment for aluminums? - ANS-
precipitation/solution hardening
What is the longest heat treatment for aluminums? - ANS-aging, which is also done
at the lowest temperature
What is the difference between anodizing and hard coating? - ANS-anodizing is a
thinner layer and can be colored, hard coating is thicker and done for corrosion and
wear resistance only
What should you keep in mind when anodizing? - ANS-corners are hard to anodize,
so rounded edges are better for this
How is anodizing done? - ANS-it is set up in a corrosive cell to help aluminum
oxides form
What elements can cause problems in anodizing? - ANS-copper and silicon
Which aluminum alloys are the most susceptible to stress corrosion cracking? -
ANS-2000 and 7000
Correct
1000 Al - ANS-commercially pure aluminum (99% minimum)
2000 Al - ANS-copper
3000 Al - ANS-manganese
4000 Al - ANS-silicon
5000 Al - ANS-magnesium
6000 Al - ANS-magnesium and silicon
7000 Al - ANS-zinc
7000-F - ANS-zinc; as fabricated
4000-W - ANS-silicon; solution heat treated
3000-O - ANS-manganese; annealed
5000-H12 - ANS-magnesium; 1/4 strain hardened
3000-H18 - ANS-manganese; full strain harden
What Aluminum series are heat treatable? - ANS-2000, 6000, 7000
What aluminum series are not heat treatable? - ANS-1000, 3000, 4000, 5000
2000-T3 - ANS-copper; furnace solution heated, quenched and COLD WORKED
6000-T4 - ANS-magnesium and silicon; furnace solution heat treated, quenched
and NATURALLY AGED
7000-T6 - ANS-zinc; furnace solution heat treated, quenched and FURNACE AGED
What are the physical properties of aluminum compared to other metals? - ANS-
lighter than all other engineering metals, high thermal and electrical conductivity,
good corrosion resistance in atmospheric environment
Aluminum has how much of the conductivity of pure copper? - ANS-60%
Which has a higher conductivity per unit mass, aluminum or copper? - ANS-
aluminum
, How is precipitation hardening done? - ANS-temperature raised to about 800F,
water quenched and then aged
What does Fe do in aluminum? - ANS-increases the strength and hardness and
reduces hot-cracking in casting
What does Mn do in aluminum? - ANS-improves ductility and impact strength,
castability and reduces shrinkage
What does Si do in aluminum? - ANS-increases fluidity and corrosion resistance,
makes it difficult to machine
What does Mg do in aluminum? - ANS-improves strength, difficult to cast,
precipitation harden
What does Zn do in aluminum? - ANS-lowers castability, prone to hot cracking and
shrinkage, promotes high strength
What does Cu do in aluminum? - ANS-increases strength, can cause brittleness,
improves machinability
What is the annealing process for aluminums? - ANS-done on non-heat treatables
What is the stress relieving process for aluminums? - ANS-can be done on all alloys
to prevent stress corrosion cracking
What is the highest temperature heat treatment for aluminums? - ANS-
precipitation/solution hardening
What is the longest heat treatment for aluminums? - ANS-aging, which is also done
at the lowest temperature
What is the difference between anodizing and hard coating? - ANS-anodizing is a
thinner layer and can be colored, hard coating is thicker and done for corrosion and
wear resistance only
What should you keep in mind when anodizing? - ANS-corners are hard to anodize,
so rounded edges are better for this
How is anodizing done? - ANS-it is set up in a corrosive cell to help aluminum
oxides form
What elements can cause problems in anodizing? - ANS-copper and silicon
Which aluminum alloys are the most susceptible to stress corrosion cracking? -
ANS-2000 and 7000
