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.
What metal was Thanos' blade or sword made of, and could it be broken or shattered? His sword was made from uru. Uru is metal found in the heart of a dying star and it is very VERY strong. Stormbreaker was made out of uru and it went straight through a 6 infinity stone blast and came out with 0 damage.
The fact that Thanos possesses enough power to beak vibranium is a testament to the strength of the Mad Titan, but more importantly, the weapon itself. Although the origin of the sword is unknown, the evident force and qualities of the blade reveal clues to its composition.
The sword was made from an extremely sturdy material, durable enough to withstand strikes from both Stormbreaker and Mjølnir. It was able to break through vibranium, having shattered Captain America's Shield after repeatedly striking it.
Summary. Dargonite, an alloy from the future, is stronger than both Adamantium and Vibranium in the Marvel Universe. There is evidence to suggest that Dargonite has already been introduced in the MCU, as seen in Avengers: Infinity War and Avengers: Endgame.
In this case, Mjolnir is officially made of a material called Uru. It's described in the comics as a metal ore, but one that actually resembles stone. It's only found on the world Nidavellir, one of the Nine Realms that Asgard rules.
At one time, the order was Uru, (Thor's hammer), Adamantium, Vibranium, in that order. But, since Marvel could not use Adamantium in the movies (licensing reasons, deal with godawful Fox), Vibranium is essentially the MCU's Adamantium and the strongest metal on Earth.
In the MCU movies. His physical weakness is blade weapons. He defended himself from Loki's knife. Set up an illusion on Knowhere, when Gamora attacked and cut his throat(and she wasn't too surprised it worked) Almost killed off-screen by Nebula (Probably with her knife)
If MCU Thanos can easily break Vibranium, can the Hulk? He can dent it. However, every time we've seen vibranium being broken in the MCU, it's been done using a similarly durable weapon.
The simple answer is no. Yes, Hulk absolutely smashes Thor to the ground with Mjolnir, but, he's holding both Thor and the hammer. Hulk wouldn't have been able to lift Mjolnir by himself, but since the God of Thunder had a firm grip on it as well, he was able to use it as a weapon against his teammate.
It would need to be a more durable metal in order to break Vibranium and that's without a doubt. Even though Vibranium is said to be the strongest natural metal of all time and has energy absorbing abilities. In Avengers: Endgame, Thanos was able to cut/break apart Captain America's vibranium shield.
It's important to note that the rules around worthiness had been temporarily suspended to allow this to happen. As soon as the fight was over, Superman couldn't lift the hammer anymore. However, under normal circumstances, without any weird interference, Superman is worthy of Mjolnir.
Can Magneto lift Mjolnir with his metal powers? Yes he can,, but he won't get any powers. Still though having an indestructible hammer to manipulate is pretty handy With that being said Thor can also use Mjolnir to remove Magnetos forcefields …
Loki is confirmed to be worthy of lifting Thor's hammer, Mjolnir, for the first time in official Marvel canon. In The Immortal Thor #5, Loki confidently catches and wields the hammer, showcasing his growth and heroism.
Superhuman Durability: Groot's hide is composed of wood dense enough and durable enough to make him immune to most conventional weapons, including gunfire and fire which would consume most woods.
Unlike Mjølnir, however, the weapon is not enchanted to prevent those deemed "unworthy" from holding it, making anybody with sufficient strength capable of using the weapon.
During a Vudu Viewing Party for Avengers: Infinity War, co-directors Anthony and Joe Russo revealed a key difference between Thor's hammer Mjolnir and his new ax Stormbreaker: the latter doesn't require worthiness. That's why Groot was able to lift the ax, not because he was worthy but because he didn't need to be.
On top of that, Logan's claws can cut through nearly anything, including the skin of beings like the Hulk. Piercing Superman's flesh would be difficult but far from impossible for Wolverine, making the Man of Tomorrow vulnerable to every slash and stab attack Logan lands on him.
They can cut through steel like butter. They have been shown to pierce Terrax, and damage Ultron, two highly durable & invulnerable characters (New Avengers v3#5 & Avengers v3#21); why not also Hulk? A vibranium weapon imbued with the power of the Wakandan gods. It's been shown to cut through anything.
Can Wolverine's claws cut Captain America's Shield?
Captain America's Proto-Adamantium shield was left unscathed by Wolverine's claws, as it would be in most comic cases. The MCU and X-Men Universe versions of the characters, on the other hand, would have a very different battle of metal.
