Question

a) Explain the mechanism of precipitation hardening, what types of precipitates are most effective in producing hardening? b) Explain the terms aging and overaging? c) Aluminum alloys are often supplied in with a temper grade? Explain the meaning of the temper. d) With reference to the Al-Cu phase diagram above, design an age hardenable alloy. Specify its composition and the exact heat treatment process you will use for age hardening. Assessed Al-Cu phase diagram. Atomic Percent Copper 0 10 20 30 40 50 60 70 80 90 100 1100 1084.87 1000 L 900 800 700 660 452°C 600 548.2°C 500 400 (Al) 300 0 10 20 30 40 50 60 70 80 90 100 Al Weight Percent Copper Cu

          a) Explain the mechanism of precipitation hardening, what types of precipitates are most
effective in producing hardening?
b) Explain the terms aging and overaging?
c) Aluminum alloys are often supplied in with a temper grade? Explain the meaning of the
temper.
d) With reference to the Al-Cu phase diagram above, design an age hardenable alloy. Specify its
composition and the exact heat treatment process you will use for age hardening.
Assessed Al-Cu phase diagram.
Atomic Percent Copper
0 10 20 30 40 50 60 70 80 90 100
1100 1084.87
1000
L
900
800
700 660 452°C
600
548.2°C
500
400 (Al)
300
0 10 20 30 40 50 60 70 80 90 100
Al Weight Percent Copper Cu

a) Explain the mechanism of precipitation hardening, what types of precipitates are most
effective in producing hardening?
b) Explain the terms aging and overaging?
c) Aluminum alloys are often supplied in with a temper grade? Explain the meaning of the
temper.
d) With reference to the Al-Cu phase diagram above, design an age hardenable alloy. Specify its
composition and the exact heat treatment process you will use for age hardening.
Assessed Al-Cu phase diagram.
Atomic Percent Copper
0 10 20 30 40 50 60 70 80 90 100
1100 1084.87
1000
L
900
800
700 660 452°C
600
548.2°C
500
400 (Al)
300
0 10 20 30 40 50 60 70 80 90 100
Al Weight Percent Copper Cu

Added by Brenda W.

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