Publications by Rolf Gotthardt

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Implantation of Ni ions into pure aluminium shows the formation of amorphous zones (AZ). Measurements by energy dispersive spectrometry attribute to the amorphous zones at Ni concentration of 25 at.%. These amorphous regions are relatively stable under heating and persist after post-implantation treatment. To understand microscopically this stability, molecular dynamic simulations (MD) are done. Using embedded atom method potentials, an amorphous Al3Ni is first obtained. The melting temperature determined f

Martensitic Ni-Ti was observed to transform to the austenitic phase due to defects introduced either by ion or electron irradiations at a temperature where the martensitic phase is normally stable. The phenomenon was studied by molecular dynamics simulatio ...

The implantation of Ni ions into pure Al leads to the formation of similar to 10 nm amorphous zones (AZ) which induce diffuse rings in the diffraction pattern in addition to the diffraction spots of the crystal. Measurements by energy dispersive spectrometry and electron energy loss spectrometry attributed to the amorphous zones an average Ni concentration of 25 at%. The exact structure of these AZ is still unknown. The structure is characterized here by both the total and partial radial distribution functi

Molecular dynamics simulations of displacement cascades in aluminium, aluminium-nickel solid solutions and inhomogeneous samples containing amorphous or crystalline Al3Ni precipitates are performed. It is shown that no segregation occurs inside the displac ...

At present, little is known about the response of the martensitic phase in TiNi alloys to heavy ion irradiation. However, previous studies [2,3] of ion and electron irradiation show that these alloys are highly susceptible to disorder and amorphization at damage levels below 1 dpa. This substantially affects their transformation characteristics and their shape memory effect. The present study focuses on the effect of 5 MeV Ni ion irradiation of plastically strained (epsilon-4%) martensitic TiNi thin films,

Irradiation-induced transformations in sputter-deposited Ti-rich NiTi thin films have been investigated with special attention given to the effects of prior deformation on the response of martensite phase. Irradiation at low fluence was carried out at room ...

Reversible martensitic phase transformations in a partially disordered Ni-Al alloy within the composition range from 60 to 65 at. % of Ni are investigated using molecular dynamics simulation. During a complete temperature cycle a wide hysteresis in enthalp ...

Rolf Gotthardt

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Stability of Al0.75Ni0.25 amorphous zones induced by Ni ion implantation into pure aluminium

The effect of point defects on the martensitic phase transformation

Structure analysis by diffraction of amorphous zones created by Ni ion implantation into pure Al

Molecular dynamics simulations of phase formation and stability in the Al(Ni) system under irradiation

Nickel ion irradiation of plasitically deformed martensitic titanium nickel thin films

Irradiation-induced phase transformation in undeformed and deformed NiTi shape memory thin films by high-energy ion beams

Temperature-controlled martensitic phase transformations in a model NiAl alloy

Amorphization in Al induced by high-energy Ni ion implantation

Amorphization in Al induced by high-energy Ni ion implantation

A model for amorphous phase formation in aluminium induced by high energy nickel implantation