Here a nice page regarding titanium (and other high tech materials) from my favorite bicycle frame maker:
http://www.merlinbike.com/primer_history.html
The alloy used for knife handles is usually 6AL4V (here under 6-4).
http://www.merlinbike.com/primer_history.html
The alloy used for knife handles is usually 6AL4V (here under 6-4).