Hydrogenation effect on the
crystallization of alloys leading to the development of nanostructured states
Chem.
Met. Alloys 1
(2008) 102-104
https://doi.org/10.30970/cma1.0022
N.E. SKRYABINA, D. FRUCHART, A.V. SHELYAKOV
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.
Full crystallization temperature vs. hydrogenation time for Ti50Ni25Cu25
alloys.
Keywords
Amorphous
materials / Phase transformation / X-ray diffraction