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Two original effects were evidenced upon hydrogenation of Ti50Ni25Cu25 alloys. Saturation of amorphous state Ti50Ni25Cu25 alloys with hydrogen induces the formation of a nanocrystalline structure after annealing. The main characteristic of the nanocrystalline state is the appearance of two steps of crystallization. When the temperature of the first step is reached, crystallization leads to precipitation of B2-type nucleation centers in an amorphous matrix. The well established martensite phase transformation, which occurs when cooling a sample down to the first step crystallization, is fully suppressed in the case of the hydrogen-treated materials.

Hydrogenation effect on the crystallization of alloys leading to the development of nanostructured states