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The nickel content of nickel-based high-temperature alloy is between 50% and 70%, and the alloy contents of chromium, iron, cobalt, molybdenum, aluminum, titanium and tungsten are within 20%. A method of high resolution plasma mass spectrometry was established to determine the trace elements in nickel-based high-temperature alloy. According to the principle of large isotope abundance, small interference and high sensitivity, the isotopes and resolution of the elements to be measured were optimized, the interferences of most of the multi-atom and double-charged ions were effectively eliminated. The mass spectral interferences of matrix, compositions of alloy and dissolving acid on the trace elements were investigated. The appropriate internal standard of caesium was selected to overcome the matrix effect and reduce the signal drift. Chromium was extracted by methylisobutylone, the extraction efficiency reached up to 99.7%, which eliminated the mass spectral interference of principal component molybdenum in the nickel-based high-temperature alloy. The linear correlation coefficient of the calibration curve was greater than 0.999, and the method detection limit was between 0.002 1 and 0.074 μg/g. The trace elements in the reference material was analyzed, the relative standard deviation (RSD, n=6) was between 2.9% and 7.8%, and the measured value was very consistent with the standard value. This method is simple, fast, accurate and reliable, which can meet the requirement of trace elements determination in nickel-based high-temperature alloy.

The exceptional mechanical properties of titanium alloy and nickel-based high-temperature alloy make them extensively utilized in aero-engine blades. The machinability of these materials is poor due to their high material strength and low thermal conductivity which lead to technical difficulties such as cutting heat accumulation, tool wear, and poor surface quality during the machining process. This study commences with an investigation into the material properties and processing mechanisms of titanium alloy and nickel-based high-temperature alloy, with a particular focus on recent advancements in cutting dynamics, chip formation mechanisms, tool wear, and surface integrity. The important effect of reasonable setting of cutting parameters and machining conditions on the machining integrity is discussed. The future trend for high surface integrity machining of titanium alloy and nickel-based high-temperature alloy blade is finally predicted. [ABSTRACT FROM AUTHOR]

The nickel content of nickel-based high-temperature alloy is between 50% and 70%, and the alloy contents of chromium, iron, cobalt, molybdenum, aluminum, titanium and tungsten are within 20%. A method of high resolution plasma mass spectrometry was established to determine the trace elements in nickel-based high-temperature alloy. According to the principle of large isotope abundance, small interference and high sensitivity, the isotopes and resolution of the elements to be measured were optimized, the interferences of most of the multi-atom and double-charged ions were effectively eliminated. The mass spectral interferences of matrix, compositions of alloy and dissolving acid on the trace elements were investigated. The appropriate internal standard of caesium was selected to overcome the matrix effect and reduce the signal drift. Chromium was extracted by methylisobutylone, the extraction efficiency reached up to 99.7%, which eliminated the mass spectral interference of principal component molybdenum in the nickel-based high-temperature alloy. The linear correlation coefficient of the calibration curve was greater than 0.999, and the method detection limit was between 0.002 1 and 0.074 μg/g. The trace elements in the reference material was analyzed, the relative standard deviation (RSD, n=6) was between 2.9% and 7.8%, and the measured value was very consistent with the standard value. This method is simple, fast, accurate and reliable, which can meet the requirement of trace elements determination in nickel-based high-temperature alloy. [ABSTRACT FROM AUTHOR]

The paper presents the results of investigations on diffusion welding of high-temperature alloy EI437B, using foil from high-entropy alloy of CrMnFeCoNi system as an interlayer. The features of producing foil from high-entropy alloy and its main physical-chemical properties in as-rolled and as-annealed condition are given. Increase of the degree of the foil general deformation to 99.9 % results in up to three times increase of the yield limit, and further annealing of the foil leads to its lowering to values characteristic for EI437B alloy. During diffusion welding the Young’s modulus increased from 165 to 195 GPa in the joint zone corresponding to the high-entropy alloy, which may be indicative of a diffusion-induced redistribution of elements in the interlayer. Chemical element distribution in the joint zone is indicative of their sufficiently high diffusion mobility. It is shown that application of a high-entropy alloy interlayer in vacuum diffusion welding ensures formation of a diffusion zone of a rather homogeneous chemical composition with a monotonic nature of distribution of the main alloying elements. The thermo-deformational impact results in equalizing of the characteristics of hardness and modulus of elasticity in different regions of the joint, and their physical-mechanical properties become similar. [ABSTRACT FROM AUTHOR]