  To obtain comprehensive performance, heavy elements were added into
superalloys for solid solution hardening. In this article, it is found by
scanning transmission electron microscope observation that rather than
distribute randomly heavy-atom columns prefer to align along <100> and <110>
direction and form a short-range ordering with the heavy-element stripes 1-2 nm
in length. Due to the strong bonding strength between the refractory elements
and Ni atoms, this short-range ordering will be beneficial to the mechanical
performances.
