Maisel, SaschaSaschaMaiselSchindzielorz, NilsNilsSchindzielorzMottura, AlessandroAlessandroMotturaReed, Roger C.Roger C.ReedMüller, StefanStefanMüller2021-05-142021-05-142014-09-16Physical Review B - Condensed Matter and Materials Physics 90 (9): 094110 (2014-09-16)http://hdl.handle.net/11420/9518For many decades, it has been known that rhenium imparts a tremendous resistance to creep to the nickel-based high-temperature alloys colloquially known as superalloys. This effect is so pronounced that is has been dubbed "the rhenium effect." Its origins are ill-understood, even though it is so critical to the performance of these high-temperature alloys. In this paper we show that the currently known phase diagram is inaccurate, and neglects a stoichiometric compound at 20 at.% Re (Ni4Re). The presence of this precipitate at low temperatures and the short-range ordering of Re in fcc-Ni observed at higher temperatures have important ramifications for the Ni-based superalloys. The Ni4Re compound is shown to be stable by quantum mechanical high-throughput calculations at 0 K. Monte Carlo simulations show that it is thermally persistent up to ≈930 K when considering configurational entropy. The existence of this compound is investigated using extended x-ray absorption fine spectroscopy on a Ni96.62Re3.38 alloy.en1550-235X20149American Physical SocietyPhysikJournal Article10.1103/PhysRevB.90.094110Journal Article