Effect of high temperature annealing on non-thermal equilibrium phases induced by energetic ion irradiation in FeRh and Ni₃V intermetallic compounds

Abstract

FeRh and Ni 3 V intermetallic compounds were irradiated with 16 MeV Au 5+ ions and were subsequently annealed at elevated temperatures from 100 to 500 °C. The non-thermal equilibrium A1 and L1 0 phases of FeRh, which were caused by the ion irradiation, disappeared by 300 °C-100 min annealing. The non-thermal equilibrium A1 phase of Ni 3 V caused by the ion irradiation disappeared by 500 °C-100 min annealing. The Vickers hardness for these two intermetallic compounds changes during the thermal annealing in a direction opposite to its change by the irradiation. The present experimental result shows that the combination of energetic ion irradiation and subsequent thermal annealing can be used as a useful tool for the modification of the mechanical properties of FeRh and Ni 3 V intermetallic compounds.

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

“…Therefore, different from the change in the relative degree of order, the change in Vickers hardness cannot be described only by considering the density of energy deposited through elastic collisions. For Ni 3 V, Au ion irradiation induces an order-disorder lattice structure change and this accompanies a similar decrease in Vickers hardness [5][6]. The decrease in hardness for irradiated Ni 3-Al is, however, much smaller than that for irradiated Ni 3 V. This difference in the decrease in hardness between the two kinds of intermetallic compounds can be explained by considering that Ni 3 V has the D0 22 lattice structure at room temperature and a hard lamellar-like microstructure exists in Ni 3 V [19].…”

“…In our previous study, two intermetallic compounds, Fe 55 Rh 45 and Ni 3 V, were irradiated with 16-MeV Au ions [4][5][6]. Fe 55 Rh 45 has the B2 (bcc base) lattice structure and Ni 3 V has the D0 22 (fcc base) lattice structure as thermal equilibrium phases at room temperature.…”

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

“…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) .…”

Thermal stability of irradiation-induced metastable lattice structures in NiTi intermetallic compound

“…We have reported so far the effect of energetic ion irradiation for several Ni-based intermetallic compounds from the perspective of phase transition, mechanical property and short range order of lattice structures [1][2][3][4][5]. As the irradiation induced lattice structures are metastable states which are far from the thermal equilibrium states, we have also investigated the thermal stability of ion irradiation induced lattice structures of Ni-based intermetallic compounds (Ni3Al, Ni3V, Ni3Nb and Ni3Ta) [2,6,7]. The lattice structures of Ni3Al and Ni3V are simple (cubic and tetragonal, respectively) and they consist of light elements.…”