  Conventional crystalline alloys usually possess a low atomic size difference
in order to stabilize its crystalline structure. However, in this article, we
report a single phase chemically complex alloy which possesses a large atomic
size misfit usually unaffordable to conventional alloys. Consequently, this
alloy develops a rather complex atomic-scale chemical order and a highly
distorted crystalline structure. As a result, this crystalline alloy displays
an unusually high elastic strain limit (~2%), about ten times of that of
conventional alloys, and an extremely low internal friction (< 2E-4) at room
temperature. More interestingly, this alloy firmly maintains its elastic
modulus even when the testing temperature rises from room temperature to 900 K,
which is unmatched by the existing alloys hitherto reported. From an
application viewpoint, our discovery may open up new opportunities to design
high precision devices usable even under an extreme environment.
