Energetic ion beam induced crystal phase transformation and resulting hardness change in Ni3Al intermetallic compound

Ion Species/Energy Dependence of Irradiation-Induced Lattice Structure Transformation and Surface Hardness of Ni₃Nb and Ni₃Ta Intermetallic Compounds

“…These results were obtained under the same irradiation condition that all intermetallic compound samples were irradiated with 16 MeV Au ions at room temperature. Also, we have performed Al and I ion irradiation for Ni 3 Al intermetallic compound and con rmed the transition to the disordered fcc structure 32) . To use the energetic ion beam irradiation as a tool for material modi cations, we need to nd irradiation parameters which dominate the irradiation effect.…”

“…They are promising as a next generation type of high temperature materials and it is needed to investigate not only structure transformation, but also mechanical property. In our previous results, we showed the lattice structure transformation, which was induced by energetic ion irradiation, and the change in Vickers hardness for Ni 3 Al 32) , Ni 3 V 33,34) , Ni 3 Nb and Ni 3 Ta 35) intermetallic compounds. At room temperature, Ni 3 V intermetallic compound shows the tetragonal ordered structure (D0 22 structure), and Ni 3 Al intermetallic compound shows the cubic ordered structure (L1 2 structure).…”

“…At room temperature, Ni 3 V intermetallic compound shows the tetragonal ordered structure (D0 22 structure), and Ni 3 Al intermetallic compound shows the cubic ordered structure (L1 2 structure). However, both ordered structures change into the disordered fcc structure (A1 structure) by the energetic ion irradiation [32][33][34] . While for Ni 3 Nb and Ni 3 Ta intermetallic compounds, the lattice structures transformed from the ordered orthorhombic or monoclinic structure to the amorphous state by the ion irradiation 35) .…”

Modification of Lattice Structures and Mechanical Properties of Metallic Materials by Energetic Ion Irradiation and Subsequent Thermal Treatments

“…However, such studies for nuclear power plants and space developments have treated the negative effects of ion irradiation (so-called "radiation damage") on materials' properties. In our recent studies, we have positively used the energies deposited by energetic ion/electron irradiation for the modification of materials properties such as the mechanical properties [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], magnetic properties [24][25][26][27][28][29][30][31][32][33][34][35][36][37], and optical properties [38] of metallic and oxide materials.…”

“…In the following chapters, we will summarize our recent experimental results about the modification of the hardness by ion irradiations for two kinds of metallic materials; dilute aluminum alloys [7][8][9]17,19] and nickel-based intermetallic compounds [11,13,15,16,18,20,21]. The former is an example of the materials' modification through the irradiation-enhanced process, and the latter is that through the irradiation-induced process.…”