When the innovative Mull 42 IMPROBABLE was built in 1971, the Barient Winch Company produced a couple of custom winch drums of titanium. This "magic" metal was significantly lighter than stainless steel, had higher crack resistance and strength than aluminum, and excellent resistance to seawater induced corrosion. Perfect for the highly loaded wire jib sheets being used on America's Cup 12 meters. And on IMPROBABLE.
Unlike in cycling, sports equipment, aero, and medical industries, you don't see many boat parts built of titanium these days. Although titanium is commercially available, it is likely too expensive for the general sailing market. In it's place, non-metal carbon-fiber is now the boat equipment material of choice after aluminum.
In the orthopedic medical field, titanium rules for implants. Titanium is, "bio-compatible", non-toxic, non-magnetic, and not rejected by the body. It is stronger than bone, with good fatigue strength and corrosion resistance.
My left foot now has a titanium plate and screws to redirect (fuse) the big toe joint. I am currently at 9 weeks post-op, fully weight bearing, walking about half-speed, with a slight limp. The foot remains noticeably swollen, which is normal to at least 13 weeks, and I have to wear a special shoe with stiff sole and Velcro adjustments to get around. At least there is no more fiberglas cast, which was good for sympathy, but no fun for itching or taking showers. Thank you, DURA MATER, for your query. I would guess I'm 75% into the process, with several months to go of healing, swelling reduction, and bone consolidation, as well as beginning physical therapy, before a final result.
Meanwhile, what are the TSA inspectors going to say when I tell them I have metal in my foot? I suppose they see metal implants on a regular basis on their X-ray machines. Nevertheless, my entrance always seems to trigger an extra level of inquisition. Stay tuned.