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