A thermodynamic model for solid state amorphization: Application to Ni-Ti multilayers of different microstructures

Conference · Tue Jul 01 04:00:00 EDT 1997

OSTI ID:20015543

Boettger, A; Benedictus, R; Mittemeijer, E J

On the basis of an assessment of both the phase-formation energies and the energies of interfaces and grain boundaries the driving force for solid state amorphization (SSA) in crystalline Ni crystalline Ti and amorphous Ni- crystalline Ti multilayers was calculated. It followed that the structure of the interfaces and grain boundaries, and thus their energies is of crucial importance for the occurrence (or not) of SSA. The SSA behavior of the two types of Ni-Ti multilayers upon annealing was investigated using X-ray diffraction and (high resolution) transmission electron microscopy. The crystalline Ni-crystalline Ti multilayers showed SSA at both the Ni-Ti interfaces and the Ti grain boundaries. The amorphous Ni-crystalline Ti multilayers exhibited SSA at the Ti grain boundaries only. These observations agree with the predictions from the thermodynamic model.

• Research Organization: Delft Univ. of Technology (NL)
• OSTI ID: 20015543
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMORPHOUS STATE
COMPOSITE MATERIALS
CRYSTALS
EXPERIMENTAL DATA
INTERFACES
MICROSCOPY
MICROSTRUCTURE
NICKEL
TITANIUM
X-RAY DIFFRACTION