As a subject matter expert in materials science and comic book lore, I can provide an informed answer to your question. In the realm of comic books, particularly within the Marvel Universe, adamantium is often portrayed as one of the strongest, if not the strongest, known metals. It is best known for being used in the creation of Wolverine's claws and skeleton. However, there are a few materials within the Marvel Universe that are considered to be on par with or potentially stronger than adamantium:


1. Uru: This is a magical metal found in the realm of Asgard, the home of the Norse gods. Uru is used to create powerful weapons and is known for its enchantments, which can make it stronger than adamantium depending on the context.


2. Eternium: Introduced in the Marvel Universe, Eternium is a substance that can potentially be stronger than adamantium. It is a rare metal that has been used to create powerful artifacts and weapons.


3. Carbonadium: This is a metal alloy that, in some Marvel storylines, is depicted as having properties similar to or surpassing those of adamantium. It is used in the creation of certain advanced technologies and weapons.


4. Vibranium: While not as hard as adamantium, vibranium is a unique metal due to its ability to absorb and dissipate kinetic energy. It is used in the creation of Captain America's shield and Black Panther's suit. Its unique properties make it a different kind of "strong" compared to adamantium.


5. Promethium: This is a fictional metal that is sometimes mentioned as being stronger than adamantium. It is a rare and powerful substance within the Marvel Universe.

It's important to note that the strength of these materials can vary greatly depending on the storyline, the writer, and the context in which they are used. In real-world materials science, there is no material that surpasses the fictional properties of adamantium, but there are materials like carbon nanotubes, graphene, and certain steel alloys that are extremely strong and are used in various high-strength applications.

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Proto-Adamantium: The adamantium-vibranium alloy used in Captain America's shield is the strongest human-made material on Earth. It's greatest strength is its nearly immutable nature and resistance to being damaged or changed.read more >>