René 41

René 41 is a nickel-based high temperature alloy developed by General Electric. It retains high strength in the 1,200–1,800 °F (600–1,000 °C) temperature range. It is used in jet engine and missile components, and other applications that require high strength at extreme temperatures. René 41 is considered a nickel alloy based upon its chemical composition.[1]


René 41 was used to create the outer shell of the Mercury space capsule, due to its ability to retain high strength at very high temperatures.[2]


  1. "Rene 41 Chemistry". Rolled Alloys Inc. Rolled Alloys Inc. Retrieved October 29, 2014.
  2. We Seven: by The Astronauts Themselves. Simon & Schuster. 1962.

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