Metals Flashcards
What are the three main categories of metals for orthopaedic implants?
- Stainless Steels
- Cobalt-Chromium Alloys
- Titanium Alloys
What are the two most commonly used stainless steels?
- 316 Alloy
- 316L Alloy
Chromium alloys can be _______ to give excellent corrosion resistance
Passivated
What is cold finishing?
Putting plastic deformation into the material
List cold working/finishing and annealing in terms of resulting strength (best to worst)
- Cold Working
- Cold Finishing
- Annealing
What are the two general compositions of Cobalt-Chromium alloys?
- CoCrMo
- CoNiCrMo
CoCrMo is typically ____ into its desired form
Cast
CoNiCrMo is normally _________ into its desired form
Hot forged
Which Cobalt-Chromium alloy is typically used in highly loaded implants? (Hip, knee)
CoNiCrMo
Rank Solution/Fully Annealed and cold-worked conditions for wrought CoNiCrMo in terms of the resulting strength (best to worst)
- Cold Worked
- Solution Annealed
- Fully Annealed
How does Cobalt-Chromium compare to stainless steel as an implant?
Good wear properties and more scratch resistant
What is the classification (Class 1-4) of unalloyed titanium based on?
Inclusion of impurities
What is the most common Titanium alloy?
Ti6Al4V - Titanium 6-4
What kind of crystal structure contributes to alpha phase titanium alloys having poor forgeability?
HCP
What kind of crystal structure contributes to Beta phase titanium alloys being stronger and more forgeable than Alpha phase alloys?
BCC
