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mat sci 298 > Lecture 8 - Copper Alloys > Flashcards

Lecture 8 - Copper Alloys Flashcards

1
Q

Which elements have higher conductivity than copper?

A

Silver

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2
Q

What reduces the electrical conductivity?

A

defects
alloys

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3
Q

What 5 things do defects include?

A

vacancies
impurities
dislocations
grain boundaries
twins

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4
Q

What are the four unique qualities of pure copper?

A

high electrical conductivity
high thermal conductivity
excellent ductility and toughness
good corrosion resistance

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5
Q

What happens when copper oxidizes?

A

degrades conductivity (P and B are added to deoxidize)

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6
Q

What happens when Al is added to Cu?

A

high strength fine dispersion of Al2O3

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7
Q

What are the four biggest reasons to use copper?

A

electrical conductivity
corrosion resistance
heat transfer
structural capability

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8
Q

What is brass?

A

5-40% Zn

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9
Q

What is Nickel Silver?

A

25% Zn + 10-20% Ni

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10
Q

What is Bronze?

A

4-12% Sn

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11
Q

What is Phosphor Bronze?

A

normal bronze + 0.2% P

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12
Q

What is Aluminum Bronze?

A

normal bronze + 3-10% Al, Fe, Ni, Sn

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13
Q

What is copper-nickel?

A

10-70% nickel

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14
Q

What is copper beryllium?

A

1-2.5% Be

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15
Q

Where does the strength of most Cu alloys come from?

A

solid-solution strengthening
cold working

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16
Q

Which alloys can be precipitation hardened?

A

Cu-Be and Cu40Zn

17
Q

What are the five families of coppers?

A

copper alloys, brass (Zn)
phosphor bronze (Sn)
aluminum bronze (Al)
silicon bronze (Si)
cupronickel, nickel silvers (Ni)

18
Q

Why is it difficult to use L-PBF on fully dense Cu materials?

A

low absorptivity against 1070 nm laser

19
Q

How does the tensile ductility of AM-Cu compare to that of cold rolled Cu with similar yield strength?

A

Better

20
Q

What is the biggest application for copper?

A

electrically conductive materials

21
Q

Which copper alloy is the most important?

A

C63000 (NAB)

22
Q

What are the two most popular techniques for manufacturing C63000?

A

WAAM and L-DED

23
Q

What other treatment can precipitation hardened alloys do?

A

aging treatment

24
Q

What are two common errors when using L-PBF on Cu?

A

lack of fusion and overfusion

25
Q

What is the staircase effect?

A

pool width makes curved surfaces into steps rather than smooth lines

26
Q

How is the oxygen impurity level in copper?

A

relatively low

27
Q

What are the two processes most used on copper?

A

L-PBF, EBM

28
Q

What is the top choice for manufacturing nickel aluminum bronze?

A

WAAM

29
Q

What is nickel aluminum bronze used for?

A

large structures

30
Q

Why is L-PBF for NAB worse than WAAM?

A

phase changes result in low ductility

mat sci 298 (11 decks)

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