PSI - Issue 65

E.G. Zemtsova et al. / Procedia Structural Integrity 65 (2024) 310–316 E.G. Zemtsova et al. / Structural Integrity Procedia 00 (2024) 000–000

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The further process uses titanium isopropoxide Ti(OH(CH 3 ) 2 ) 4 and propylene glycol CH 3 (OH)-CH(OH)-CH 3 . The reagents were supplied to the system step by step using a valve system at 150 °C. First, isopropoxide was supplied to the system for 15 minutes, then propylene glycol was also supplied for 15 minutes. The next step in the synthesis of the reinforcing phase particles is carbonation in an inert atmosphere (He) at 600 °C for 1 h. As a result, samples of the reinforcing phase containing TiC nanostructures with an Al sublayer on the Ni particles surface (Ni/Al-TiC) with a nanostructure size of ca. 2 nm were obtained. The first step in obtaining a Ni-based composite is the introduction of Al  TiC particles into the initial Al matrix in ratios of 1:99, 3:97 and 5:95 wt.%. Ni powder (average particle size 50 microns) and particles of the reinforcing phase of the Ni/Al-TiC composition were mixed in a planetary spherical mill RM 100 CM in ratios of 3:97 wt.%, 5:95 wt.%. The ratio of material to grinding media was 1:25. Then 7.2 g of the resulting mixture was pressed using a pneumohydraulic press Sorokin 7.75. Pressing was carried out in 3 stages. At the first stage, the load value was 15 tons, at the second 35 tons, at the third stage, the material sample was loaded up to 50 tons. At each stage, the sample was kept under load for 15 minutes. Between pressing stages, the material was sintered in a protective atmosphere at 600 °C. Finally, after the third sintering, the sample was heated at 1100 °C for 1 h. The samples of composite obtained in this way were gray metal plates (20*20*2 mm) having a metallic luster. X-ray phase analysis was performed on a Bruker D2 Phaser powder diffractometer. The phases in the samples were identified using International Centre for Diffraction Data patterns. The structure of the composite and Ni/Al-Ti reinforcing particles and elemental analysis were evaluated using a Zeiss Merlin scanning electron microscope with additional attachments for Oxford Instruments INCAx-act X-ray microanalysis. The elemental analysis was performed for dry particles deposited on a monocrystalline silicon substrate. The photoemission spectra (Ti2p, Ni2p, O1s, C1s, Al2p) were measured in normal geometry using an ESCALAB 250 Xi spectrometer using monochromatized AlKa radiation (1487 eV). The binding energy was calibrated by the peak of the basic Au 4f7/2 level and the Fermi level measured on pure gold foil. To obtain information about deeper layers, argon ions etching at 500 eV was used. The etching time was 300 and 600 seconds. 1.4. Mechanical tests, uniaxial tensile tests Uniaxial stretching was performed on a Shimadzu AG-50kNX testing machine at room temperature, the deformation rate was 5 • 10 -4 s -1 . The deformation of the samples was controlled by a TRViewX video extensometer for 55 seconds. Bending tests were carried out in accordance with GOST 14019-80 "Metals and alloys. Methods of testing the strength of the joint". 1.2. Production of a bulk composite based on Ni reinforced with TiC nanostructures 1.3. Characterization

2. Results and discussion

2.1. Production of a metallic composite with two hardening modifiers

Samples with carbide nanostructures on the surface of dispersed Ni particles with a sublayer of Al (Ni/Al-TiC), with a different number of layering cycles, were obtained. XRD confirms that after one layering cycle (nanostructure size from 0.5 nm) and at 600 °C heating, TiC is amorphous and is not detected. TiC appears only after 2 layering cycles during heating at 600 °C. The average size of the crystallites is evaluated to be ~2 nm. For further research and the production of Ni-based composites, a dispersed phase of Ni particles with carbide nanostructures was used for reinforcement after 2 cycles of layering with an Al sublayer (Ni/Al-TiC). To obtain a Ni