Iron Man Armor: Mark VI

The Mark VI armor is a replacement for mark IV after Tony Stark realised the ARC Reactor was poisoning his body. This suit uses the new element: Vibranium. A triangular shape appears in the chest for the vibranium.

Iron Man 2
Tony created the vibranium from his fathers research and JARVIS informed him that it would be a suitible replacement for the ARC Reactor so Tony built a new suit around it and fought Whiplash in the final battle.

The Avengers
This suit was the defualt suit Tony now wore and traveled to Germany with it and used it when battleing Thor.

This new element also stoped Loki from controlling Tony's brain.