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The hardest practical metal is high carbon steel.

Titanium is lighter, but has more volume with equivalent strength.

Most alloys are either too heavy, too brittle or too large to be practical.

For example, making a sword of pure diamond would be the hardest type of sword (And certainly the most expensive) yet one decent hit could crack it because it is not malleable enough.

There have been experiments with hybrid materials like a carbon fibre tang with a steel blade, but nothing really happening yet.

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14y ago

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