I recently found out that the little protective rails over the toggle switches in the space shuttle were made out of titanium. I'm not sure of which alloy specifically, but probably 6AL4V (or "Grade 5"). I heard rumors that the covers for each switch cost near $800 (USD). Titanium is heavier than aluminum, so what was the reasoning for using it to make the switch covers?
All I can think of, is in the event of a crash the titanium would better protect the switches than aluminum... But I'm not sure how high that is on their list of concerns in the event of a crash, or similar event.