Thanos' Sword Is Made From Uru Uru is a special metal in the Marvel universe that is said to only be created in the core of dying stars, making it ultra rare and incredibly strong. In fact, Thor's Mjolnir is made of the Uru metal making it comparable to Thanos's sword in terms of strength.
Thanos sword is very likely made of Uru, one of the strongest metals in the Universe. The same substance that was used by Eitri to make Thor's weapons on Nidavellir – Mjolnir and Stormbreaker. Uru is a metal ore found only on the first moon that came into existence.
Thanos' sword in Avengers: Endgame is more than a match for Earth's Mightiest Heroes. The sword is powerful enough to destroy Cap's vibranium shield. In Avengers: Endgame Thanos faces off against the Avengers in the Battle of Earth, destroying Captain America's vibranium shield with his double-edged sword.
MCU theorists say that Vibranium is the strongest metal on EARTH. While Thanos' blade is made of Uru which is a space metal stronger than Vibranium.
No. Adamantium doesn't exist in the MCU currently because of copyright issues. It's widely believed that Thanos' blade is made of Uru Metal, the same thing Stormbreaker is made out of, or Vibranium, as it's a cosmic metal which is clearly very powerful.
Unlike adamantum, Magneto cannot manipulate vibranium – not if it's pure. Vibranium is a rare, extraterrestrial metallic ore. It has near-mystical properties that allow for energy manipulation and more. There is a Wakandan isotope and an Antarctic isotope, and both of them are completely unaffected by Magneto's powers.
While vibranium is the more durable material, adamantium is the more dense material. This means that given the right circumstances, adamantium can potentially cut through pure vibranium.
According to the commentary track on the Endgame Blu-Ray, Thanos' sword comes from somewhere off-world, making it stronger than vibranium and quite a number of other things as well. Thor's weapons can't scratch them, for instance. Thanos' sword could thus be made of adamantium, which also seems unlikely.
While Adamantium might appear like the stronger metal in terms of sheer strength, Vibranium's versatility gives it a clear advantage. Adamantium is rigid and powerful but is only used in terms of weaponry, whereas Vibranium can be used for a variety of purposes.
After many years of being kept a secret, Tony Stark finally rediscovered Vibranium and re-synthesized it into an Arc Reactor to create clean pure energy.
Thanos didn't lift Mjolnir, Captain America did
With Mjolnir's worthiness enchantment resulted in Thor being able to lift the hammer only if he is considered to be worthy, but likewise, the enchantment is not discriminatory in nature, and anyone who is deemed worthy is able to lift the hammer.
With all of this in mind, there is a strong argument that the Power Stone is ultimately responsible for the creation of Vibranium, and it would certainly explain why it's so durable and able to withstand blasts from Infinity Stone-powered weapons, such as Loki's Scepter and HYDRA's World War II arsenal.
In Age of Ultron, concentrated energy blasts of sufficient heat and power are also shown to be effective against Vibranium. Thor's lightning, Vision's Mind Stone lasers and Iron Man's repulsor beams were able to melt Ultron's body when used in combination, meaning that high enough temperatures can break Vibranium down.
Thanos' IQ is over 9000.
A Titan among Men
Not known to use much in the way of personal weapons, the one extremely notable artifact he keeps with him is the Infinity Gauntlet. Made from Uru metal on Nidavellir by Eitri, under duress from Thanos, the Infinity Gauntlet enables its wearer to harness the power of each Infinity Stone added to it.
The seventh Gem was hidden in an unknown realm known as the Ultraverse. This goldish color gem was said to obtain the essence of Nemesis. She was the omnipotent being, which shattered herself across two universes, because she grown tired of her own existence.
Vibranium is not unbreakable or impossible to damage, true Adamantium is denser and with a way superior penetrating force that allows it to cut through almost anything. BP's armor would give him protection and would be really hard to go completely through but Logan can damage it.
Point is, Groot's husk is tougher than adamantium. Considering that Groot can manipulate his limbs and extend his roots to near infinite lengths, it only follows that he can alter the size of his entire body.
The comics have told a different story: ferocious slashes and bashes from Wolverine's claws can beat most supervillains and super-mutants, but most of the time they can't break through Captain America's trusty shield. At best, scratching off some of the surface paint.
The blade's handle is attached to a sprocket in the center, which is attached to a chain that is propelled by a motor. This spins the sword around like a helicopter, or like Thanos himself.
Bigger than his enemies, bigger than his family, bigger than any other cosmic threat, Thanos's greatest weakness will always be himself. We've discussed his ego previously, but it's his insecurities about his own worthiness that will ever prove to be his downfall.
This truly showed Scarlet Witch as being stronger than Thanos, as she destroyed his sword and would have killed him were it not for his plan to rain fire from his ship.
In the Iron Man 2 novelization, the new element created by Tony Stark to replace Palladium in the arc reactor is called Vibranium. This information would later be invalidated by Captain America: The First Avenger, where Vibranium is shown as a rare metal already existing in the 1940s.
The adamantium covering Wolverine's bone claws is one of the strongest metals in the entire Marvel universe, but as tough and unbreakable as it may be, the comics themselves prove they're no match for Thor's hammer Mjolnir.
James Kakalios, a physics, and astronomy professor at the University of Minnesota suggests a substance known as graphene would be the closest substance to vibranium known to man. Graphene is an ultra-thin form of carbon; only one atom thick.