Effect of Initial Temperature and Mechanical Activation on Synthesis in a Ti + Al System

Кочетов, Н. А.; Seplyarskii, B. S.

doi:10.1134/s0010508220030077

Cited by 16 publications

(2 citation statements)

References 30 publications

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“…A bias increase is followed by ionizing the space between two electrodes at the moment of their approach. Dielectric breakdown by spark provokes a discharge channel that creates the conditions of low-temperature plasma with 10,000 • C that can be observed in particular conditions (forming intermetallics of Al 2 Cu [14,15], ZnNi x [16], CeNi 2 [17], burning titanium at 1200 • C [18,19]) in the form of an instant growing gas bubble surrounded the discharge channel. Then, pulses interrupt to restore the breakdown conditions for the next pulse-the bias in the gap, erosion products' washing away from the working area.…”

Section: Introductionmentioning

confidence: 99%

Wire Tool Electrode Behavior and Wear under Discharge Pulses

et al. 2020

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This work is devoted to researching the tool electrode behavior and wear under discharge pulses at electrical discharge machining. The experiments were conducted on the workpieces of 12Kh18N10T (AISI 321) chrome-nickel anti-corrosion steel and D16 (AA 2024) duralumin by a 0.25-mm-diameter CuZn35 brass tool in a deionized water medium. The developed diagnostic and monitoring mean based on acoustic emission registered the oscillations accompanying machining at 4–8 kHz. The obtained workpiece and non-profiled tool surfaces were investigated by optical and scanning electron microscopy. Calculated volumetric and mass removal rates showed the difference in the character of wear at roughing and finishing. It was shown that interaction between material components in anti-corrosion steel machining had an explosive character between Zn of brass and Ni of steel at a micron level and formed multiple craters of 30–100 µm. The secondary structure and topology of worn tool surfaces were caused by material sublimation, chemical interaction between material components at high heat (10,000 °C), explosive deposition of the secondary structure. Acoustic diagnostics adequately registered the character of interaction. The observed phenomena at the submicron level and microstructure of the obtained surfaces provide grounding on the nature of material interactions and electrical erosion wear fundamentals.

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Section: Introductionmentioning

confidence: 99%

Wire Tool Electrode Behavior and Wear under Discharge Pulses

et al. 2020

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“…Me + 2B mixtures (2B mixes) were blended in a porcelain mortar while mixes 8B and 10B mixes, in a ball mill for 2 h. The above blends were used to fabricate cylindrical compacts 10 mm in diameter, 12-20 mm long (under a pressure of 100 kg/cm 2 ) that were used in combustion experiments under 1 atm of Ar. The latter ones were carried out as described in detail elsewhere [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Combustion of Transition Metal–Boron Mixtures in Argon Gas

Кочетов

Rogachev

Ковалев

et al. 2021

Int. J Self-Propag. High-Temp. Synth.

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Combustion of Me + 2B, (Me1 + Me2 + Me3 + Me4) + 8B, and (Me1 + Me2 + Me3 + Me4 + Me5) + 10B mixtures (Me = Ti, Hf, Nb, Zr, Ta) aiming at the preparation of a high-entropy metal diboride by SHS method was studied by using XRD and SEM analyses. We succeeded to prepare high-entropy diboride [TiHfZrNbTa]B 2 by SHS method from the above mixtures in a considerably good yield (54 vol %). Our results may turn interesting to those engaged in R & D of new high-entropy borides.

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