Nanocrystalline alloys are limited at high temperatures as their small grain size makes them unstable against grain growth through thermal exposure. The study aims to develop thermally stable nanocrystalline alloys through stabilizing the nanocrystalline structure at high temperatures. Using multicomponent alloys, the researchers were able to achieve grain sizes smaller than 50 nm after 900°C annealing for 5 hours, demonstrating improved thermal stability over pure metals and binary alloys through the use of complex compositions.