Different alleging behaviors of Co-Mo multilayered films upon ion irradiation and thermal annealing

The Co-Mo system is characterized by a small negative heat of formation bei ng -7 kJ/mol, which provides a small driving force for alloying. In the cas e of the initial multilayered films with closest-packed semi-coherent inter faces, solid-state interfacial reaction is frustrated upon thermal annealin g even at a temperature up to 600 degrees C. However, amorphization through interfacial reaction was achieved upon ion irradiation as the intensive io n irradiation can elevate the initial energetic state by the irradiation en ergy as well as destroy the semi-coherent interfaces and thus drive atomic mixing in the films eventually becoming disordered.