Aluminium Lithium Alloys Flashcards
1
Q
Why add Lithium to Aluminium?
A
Small amounts of lithium can drastically increase strength while decreasing density.
2
Q
What are the negatives of Aluminium Lithium alloys?
A
- Incredibly expensive
- Poor fracture toughness relative to 2XXX and 7XXX
- Lithium is reactive
3
Q
What is the processing route for Al-Li alloys?
A
DC cast Solution Treatment Quench Cold Work Artificial Age
4
Q
Per wt% Li what happens to density and strength?
A
Desity reduces 3%
Strength increases 6%
5
Q
What were the two reasons the development of Al-Li alloys stopped/slowed?
A
The end of the oil embargo reduced the erge for weight saving.
Eng of the cold war meant no need for much better planes.
