Bronze is an alloy of copper and tin (usually, it can be copper & arsenic). The alloying of copper and tin creates new “phases” in the metallic structure.
The copper has one main “phase” in it.

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It’s like breaking a chocolate chip cookie (representing the bronze alloy) compared to a regular sugar cookie (representing copper). If you try to break the chocolate chip cookie by sliding it in 2 directions (picture placing your hands on the cookie and having one pull straight back while the other pushes forward), the cracks need to work their way around the chocolate chips (which represent the harder phases).
Doing the same thing with a sugar cookie (representing copper), the cracks will form more easily because they do not have to go around the harder chocolate chips (the harder phases).

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