Mad science titanium swords

No - but I spent a whole afternoon watching his vids. Impressive what he's made...

If you google "Titanium blades" you'll see the discussion has come and gone years ago on the SFI forum, and the conclusion is that titanium or its alloys DO NOT make good sword blades for a variety of reasons which people can read for themselves! The complete BS perpetuated by clueless people into hi-tech 'wonder materials' is that titanium is some kind of super tough, super hard indestructible metal, which it definitely isn't. It's stronger than steel for its weight but it's really lightweight like aluminium and if made hard is brittle. The idea of titanium sword blades is a myth that came from the movie 'Blade', not from engineers or materials scientists. It's used to make diving knives which don't corrode in saltwater (and don't need to be particularly sharp or have great edge retention) and short blades for military for explosive ordinance disposal because it's non-magnetic. I'm calling this one pure BS...

His Gladius seems to hold up, although he doesn't come across as the sharpest sword in the armory.               

The trick is to make the blade stiff enough. Titanium is 60% of the density of steel, but also only about 60% as stiff. An all-titanium blade would have to be about 20% thicker to maintain the desired stiffness, compared to steel. So it would be about 75% of the weight of a steel blade. For a titanium body with steel edges, you wouldn't save as much weight, and you wouldn't get much extra length or much extra speed.

Might do better with a carbon-fibre reinforced plastic body with steel edges. Or a hollow steel body. Or give up cutting and go for a weight-saving purely thrusting cross-section (like cruciform or extremely hollow ground triangular), in which case a little shorter is better, and you end up with a smallsword.

But, in principle, titanium + steel would work. Not so much gain, at a lot of cost.