The enthalpies of formation of the ternary compounds Al 4NiY, Al 2NiY, Al 2Ni 6Y 3, Al 16 Ni 3Y, AlNiY, Al 3Ni 2Y, AlNi 8Y 3, Al 7Ni 3Y 2, and of the binary compounds Al 2Y containing nickel and Ni 5Y containing alumi...The enthalpies of formation of the ternary compounds Al 4NiY, Al 2NiY, Al 2Ni 6Y 3, Al 16 Ni 3Y, AlNiY, Al 3Ni 2Y, AlNi 8Y 3, Al 7Ni 3Y 2, and of the binary compounds Al 2Y containing nickel and Ni 5Y containing aluminum have been determined by high temperature reaction calorimetry. The enthalpy values measured are compared to previously published results where available as well as extended Miedema model predictions. The melting points of the compounds were determined by DTA and X ray diffraction was used to confirm the crystal structures of the compounds. The enthalpies of formation of the ternary compounds show a maximum along the 50%Al (mole fraction) section. The ternary compounds appear along lines of constant yttrium content consistent with binary compound solubility extensions.展开更多
The corrosion behavior of pure Ni and of binary Ni-Y alloys containing 1wt%,3wt%,5wt% Y,respectively,was investigated in air and in the eutectic (0.62Li,0.38K)2CO3 mixture at 650 ℃.The alloys are two-phase composed ...The corrosion behavior of pure Ni and of binary Ni-Y alloys containing 1wt%,3wt%,5wt% Y,respectively,was investigated in air and in the eutectic (0.62Li,0.38K)2CO3 mixture at 650 ℃.The alloys are two-phase composed of γ-Ni solid solution and intermetallic compound Ni17Y2.The experimental results indicated that the corrosion of Ni-Y alloys in air and in molten salts,respectively,produced an external NiO scale with a small amount of Y2O3 and an internal oxidation region composed of Ni and Y2O3 resulting from the oxidation of the intermetallic phase Ni17Y2.The presence of yttrium in the alloy had a positive effect on the lithiation reaction of NiO during immersion in the melt.展开更多
文摘The enthalpies of formation of the ternary compounds Al 4NiY, Al 2NiY, Al 2Ni 6Y 3, Al 16 Ni 3Y, AlNiY, Al 3Ni 2Y, AlNi 8Y 3, Al 7Ni 3Y 2, and of the binary compounds Al 2Y containing nickel and Ni 5Y containing aluminum have been determined by high temperature reaction calorimetry. The enthalpy values measured are compared to previously published results where available as well as extended Miedema model predictions. The melting points of the compounds were determined by DTA and X ray diffraction was used to confirm the crystal structures of the compounds. The enthalpies of formation of the ternary compounds show a maximum along the 50%Al (mole fraction) section. The ternary compounds appear along lines of constant yttrium content consistent with binary compound solubility extensions.
文摘The corrosion behavior of pure Ni and of binary Ni-Y alloys containing 1wt%,3wt%,5wt% Y,respectively,was investigated in air and in the eutectic (0.62Li,0.38K)2CO3 mixture at 650 ℃.The alloys are two-phase composed of γ-Ni solid solution and intermetallic compound Ni17Y2.The experimental results indicated that the corrosion of Ni-Y alloys in air and in molten salts,respectively,produced an external NiO scale with a small amount of Y2O3 and an internal oxidation region composed of Ni and Y2O3 resulting from the oxidation of the intermetallic phase Ni17Y2.The presence of yttrium in the alloy had a positive effect on the lithiation reaction of NiO during immersion in the melt.
