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Aka it makes it less brittle, which ultimately makes it stronger?

It makes it less ductile, which means it's harder and more resistant to deformation. Bronze is more brittle than copper.

Adding fibres to already brittle materials improves their resilience to tensile forces mostly

So you’re saying it makes it more brittle? Because the opposite of ductile is brittle.

Or are you saying it increase yield strength, because that is a separate property, yes?