The materials used to make Iron Mans suit have varied throughout the comics and movies. In the 2008 Iron Man film, the Mark I suit was made of reused parts from Jericho missiles, while the more advanced suits, starting with Mark III, were made of a titanium or titanium-gold alloy. In the 2019 film Avengers: Endgame, the suit was constructed of vibranium and nanotech. In the comics, the first suit was made of iron, but from there, Tony Stark incorporated and eventually replaced iron with various unspecified "alloys" all the way up to whatever nanobots are made from. Some suits have used vibranium or even uru.

According to a podcast episode on the materials science of Iron Mans suit, the suit consists primarily of Nitinol, a nickel-titanium alloy that is lightweight and possesses shape memory properties. The suit could also incorporate carbon fiber and graphite due to these materials’ strength, low weight, and temperature tolerance. These properties give rise to “healing” abilities after taking damage and allow Tony Stark to fly quicker and more efficiently.

In summary, Iron Mans suit has been made of various materials throughout the comics and movies, including iron, titanium, vibranium, and nanotech. The suit also consists primarily of Nitinol, a nickel-titanium alloy, and could incorporate carbon fiber and graphite.