Intermetallic growth kinetics and microstructure evolution in Al-Cu-Al metal-matrix composite processed by high pressure torsion

Korznikova, G. F.; Nazarov, K. S.; Khisamov, R. Kh.; Sergeev, S. N.; Shayachmetov, R. U.; Khalikova, G. R.; Baimova, Julia A.; Glezer, A. M.; Mulyukov, R. R.

doi:10.1016/j.matlet.2019.07.124

Cited by 36 publications

(20 citation statements)

References 12 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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“…Согласно серии ранних работ [8,13] Согласно [14], повышение скорости деформации при ИПДК приводит к росту доли вовлеченных в деформацию систем скольжения в материале. Это способствует, например, формированию равноосных нанокристаллических зерен γ-фазы в аустенитной нержавеющей стали, в результате протекания деформационно-индуцированного как прямого (γ → α'), так и обратного (α' → γ) превращений, в то время как при малых скоростях деформации имеет место формирование удлиненных субзерен α-фазы только за счет действия прямого деформационно-индуцированного превращения [15].…”

Section: результаты и их обсуждениеunclassified

“…Из перечисленных методов интенсивная пластическая деформация наиболее активно применяется для изготовления объемных наноструктурных металломатричных композитов [6]. В последнее время ведутся исследования по формированию слоистых металломатричных композитов из отдельных дисков двух разнородных металлов через ИПД, реализованное кручением под высоким давлением при комнатной температуре, например, Al-Mg [7], Al-Cu [8], Ag-Cu [9], Zn-Mg [10]. В этом случае образуются гибридные системы, в которых, после значительных изменений в микроструктуре за счет протекания диффузионных процессов, формируются уникальные многоуровневые структуры.…”

Section: Introductionunclassified

On the possibility of applying severe plastic deformation by high pressure torsion for the manufacture of Al-Nb metal matrix composites

et al. 2020

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The article discusses the possibility of fabrication an aluminium based matrix composite of the Al-Nb hybrid system using severe plastic deformation by high pressure torsion (HPT). Disks of aluminum (with diameters from 6 to 12 mm) and niobium (12 mm in diameter), were stacked in the form of a three-layer Al-Nb-Al package, and subjected to deformation. HPT was carried out at room temperature on Bridgman anvils under a pressure of 5 GPa at N =10, 25 and 30 revolutions, at a strain rate of ω =1 and 2 rpm. Regardless of the choice of the aluminum disk diameter and the deformation modes, monolithic and defect-free samples were fabricated. However, the most effective fragmentation and distribution of niobium in the aluminum matrix was observed when a diameter of aluminum discs was 10 mm and deformation modes N = 25 and 30 revolutions and ω = 2 rpm were applied. Three structural areas were found in the processed samples: the central one with wide curved layers of niobium in aluminum, a finely dispersed lamellar structure in the mid radius area, and a uniform distribution of niobium particles in aluminum matrix at the periphery. The observed heterogeneity of the structure in the samples correlated well with changes in microhardness, the values of which varied nonmonotonically: the minimum level (about 100 HV) was observed in the center, the maximum values (about 280 and 300 HV) in the middle of the radius and about 130 HV at the periphery of the sample, for N = 25 and 30 revolutions, respectively. In addition, it was shown by X-ray diffraction methods that at a higher strain rate and N = 25 and 30, strain-induced aging occurred in the composite material with the synthesis of the hardening intermetallic phase Al 3 Nb, the volume fraction of which increased from 2.8 to 3.1 % with increasing number of revolutions.

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“…[1][2][3][4]. Одним из методов получения естественных in situ металломатричных композитов является деформация сдвигом под давлением методом кручения под высоким давлением (КВД) [5][6][7]. Преимущество этого метода заключается в том, что, во-первых, он позволяет получать образцы композитов из пластин чистых металлов (прекурсоров), а во-вторых, и это немаловажно, получаемые образцы лишены пор и химических загрязнений, которые могут образовываться при использовании порошковых методов.…”

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“…В настоящей работе представлены результаты исследований эмиссионной эффективности естественного in situ металломатричного композита системы Al−Nb, полученного методом КВД. Выбор этой системы металлов связан с тем, что значения работы выхода электрона Al сандвича" Al−Nb−Al между наковальнями Бриджмена [7,9]. В результате КВД при 5 GPa и числе оборотов 30 при комнатной температуре были получены монолитные образцы в виде дисков диаметром 12 mm и толщиной 0.6 mm.…”

unclassified

Получение естественного металломатричного композита Al-Nb деформацией сдвигом под давлением и его эмиссионная эффективность в тлеющем разряде

Хисамов¹,

Корзникова²,

Халикова³

et al. 2020

Журнал Технической Физики

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A natural, in-situ, metal-matrix composite Al-Nb with an intermetallic phase Al3Nb with a fraction of 25% at. was obtained by deformation shear under pressure and subsequent annealing. The microstructure of the composite was studied. The emission efficiency in the glow discharge of Al-Nb composite, as well as aluminum and niobium as cold cathodes, was determined. The analysis of the difference between the glow discharge current at fixed voltages for cathodes from the studied materials is carried out.

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Intermetallic growth kinetics and microstructure evolution in Al-Cu-Al metal-matrix composite processed by high pressure torsion

Cited by 36 publications

References 12 publications

Wire Tool Electrode Behavior and Wear under Discharge Pulses

Wire Tool Electrode Behavior and Wear under Discharge Pulses

On the possibility of applying severe plastic deformation by high pressure torsion for the manufacture of Al-Nb metal matrix composites

Получение естественного металломатричного композита Al-Nb деформацией сдвигом под давлением и его эмиссионная эффективность в тлеющем разряде

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