Science fail there Normie, Adamantium is an ideal covalent metal. Think diamond style iron. Thats why its industructable. Vibranium is pretty much solid state mercury that exists at room temperature (ie its a metal that works like a liquid in a solid state, hence why it absorbs vibrations and or disrupts covalent bonding of metals). So an alloy of the two would likely just fall apart and be far weaker than pure secondary or primary adamantium.
As for Carol's power levels I'm wondering if they are bringing back binary. Which would be sweet (also it would be awesome to watch her smash the sentry like a beer bottle)