Again with the mAtallurgy Data channel...
Maybe they're trying to combine material and metallurgy into matallurgy?
Whatever portmanteau they're aiming for, their videos are excellent for understanding metals. This one goes over how different metallic ingredients affect the properties of alloy steels, the carbon-iron phase diagram, CTT and TTT graphs (something I haven't seen before, admittedly), hardenability, and ways to strengthen steel.
It's not necessarily written for my students' levels - most of them, anyway - but it's good background understanding for me to have.
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