Role of powder precursors in production of composite alloys using liquid-phase methods

Прусов, Е. С.; Panfilov, A. A.; Kechin, V. A.

doi:10.3103/s1067821217030154

Cited by 21 publications

(8 citation statements)

References 21 publications

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“…The production of AMCs was initially related to the method of powder metallurgy [7]. Modern technologies of aluminum matrix composites production mainly use the melt saturation with the use of powder materials [8,9]. In addition, special attention is currently paid to production of cast aluminum matrix composites by injecting finely dispersed high-melting additions directly in the process of casting (when pouring), which significantly increases the number of crystallization centers when the melt is cooled.…”

Section: Introductionmentioning

confidence: 99%

Investigation of thermophysical processes of obtaining various aluminum matrix composites

V.V.

A.I.²,

M.V.

et al. 2023

Technical Physics

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The possibilities of obtaining aluminum matrix composite materials of the composition Al-Al2O3 are considered by the method of liquid-phase oxidation of aluminum by purging the melt with oxygen. The obtained materials are a two-phase system with different concentrations of the solid phase. An algorithm for calculating the kinetics of aluminum oxidation in obtaining the oxide phase of an aluminum matrix composite is proposed. It is established that the beginning and completeness of the reaction on the surface of the gas bubble determines the synthesis of the oxide phase and is determined by the functions T(t), h(t) in the region of dynamic time delay, which, in turn, the queue is revealed as a function of the temperature in the contact zone of the gas bubble with the melt, taking into account the duration of the heating of the bubble along the cross section and the radius of the bubble itself. The microstructures of the obtained materials with different structural-phase state with variations in the time of purging and oxygen supply to the aluminum melt are presented. Keywords: aluminum matrix composite material, high temperature oxidation, gas bubble.

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Section: Introductionmentioning

confidence: 99%

Investigation of thermophysical processes of obtaining various aluminum matrix composites

V.V.

A.I.²,

M.V.

et al. 2023

Technical Physics

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“…Решением проблемы получения NiAl может являться перспективная технология самораспространяющегося высокотемпературного синтеза (СВС), имеющая ряд экономических преимуществ [13]. Данный процесс позволяет формировать ар-мирующие фазы в матричном сплаве.…”

Section: Introductionunclassified

Features of formation of the Al–Ni–Zr system alloy structure obtained by reducing oxide compounds by aluminothermy using SHS metallurgy

Ri,

Ermakov

et al. 2023

Izv.VUZ. Tsvet. Met.

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This work is focused on establishing the regularity of the effect of zirconium (2.21; 3.29; 3.69 and 6.92 wt.% Zr) on structure formation, the nature of distribution of elements and the microhardness of structural components in the Al–Ni–Zr system alloys obtained by aluminothermy using the SHS metallurgy. Regularities of the formation of structural components and their microhardness depending on the content of zirconium in Al–Ni alloys (50 wt.%) have been identified and scientifically substantiated. Structural components were identified by the methods of electromicroscopic studies and X-ray microanalysis of elements. The structure of the initial alloy consists of Al3Ni2 (β′-phase) and Al3Ni nickel aluminides. Zirconium doping of the alloy in the amount of 2.21 wt.% leads to crystallization of zirconium nickel aluminide Al2(Ni,Zr). With further increase in the content of zirconium (more than 2.21 wt.% Zr), complex alloyed intermetallic compounds crystallize – Zr, W, Si aluminides and Ni zirconides. A regularity was established in the decrease of the solubility of nickel in nickel aluminides Al3Ni2 and Al3Ni and their microhardness as the zirconium content increases in the Al–Ni–Zr alloys from 2.21 to 6.92 wt.%. In nickel aluminide with zirconium Al2(Ni,Zr), this contributes to a decrease in the solubility of Ni, Al and increase in the concentration of Si and Zr. Zirconium doping of the Al–Ni alloy in the amount over 2.21 wt.% contributes to an increase in hardness (HRA), despite a decrease in the microhardness of the metal base (Al3Ni2, Al3Ni and Al2(Ni,Zr)). The main reason for increasing the hardness of the Al–Ni–Zr alloys is the crystallization of complex-alloyed intermetallides – Zr, W, Si aluminides and nickel zirconide, which probably have an increased microhardness. Thus, zirconium doping of the Al–Ni alloy makes it possible to obtain a plastic metal base from nickel aluminides Al3Ni2, Al3Ni and Al2(Ni,Zr) and complex-alloyed intermetallides with high hardness.

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“…Hypereutectic aluminum-silicon alloys can be considered as natural in-situ composites where the particles of primary silicon play the role of the endogenous reinforcing phase [20]. In this connection, it is expedient to analyze the influence of impurity elements on the change of the structural and morphological characteristics of hypereutectic Al-Si alloy and their technological and operational properties with account of cast metal matrix composites behavior [21]. The presence of primary silicon particles in the eutectic matrix causes high wear resistance, thermal stability, and low coefficient of thermal expansion [22].…”

Section: Introductionmentioning

confidence: 99%

Archives of Foundry Engineering

Deev,

Prusov,

Prikhodko

et al. 2020

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Understanding the influence of iron impurity on the formation of the structure and the properties of hypereutectic aluminum-silicon alloys are important for achieving the required quality of castings, especially those obtained from secondary materials. In the present work, the influence of different iron contents (0.3, 1.1, and 2.0 wt.%) on the crystallization process, microstructure and mechanical properties of the Al-15% Si alloy was studied. It is shown that the presence of iron impurity in the Al-15% Si alloy leads to increasing the eutectic crystallization time from 6.2 to 7.6 s at increasing the iron content from 0.3 wt.% to 1.1 wt.%, changing the structure of the alloy eutectic in the solid state. The primary silicon and β-Al 5 SiFe phase coexist in the structure of the Al-15% Si alloys at a temperature below 575 °C in the range of iron concentrations from 0 to 2 wt.% in equilibrium conditions. In the experimental alloys structure, the primary crystals of the β-phase were metallographically detected only in the alloys containing 1.1 and 2 wt.% of iron impurity. Increase of the iron content up to 2 wt.% significantly reduces the mechanical properties of the Al-15% Si alloy due to the formation of large platelet-like inclusions of β-Al 5 SiFe phase.

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Role of powder precursors in production of composite alloys using liquid-phase methods

Cited by 21 publications

References 21 publications

Investigation of thermophysical processes of obtaining various aluminum matrix composites

Investigation of thermophysical processes of obtaining various aluminum matrix composites

Features of formation of the Al–Ni–Zr system alloy structure obtained by reducing oxide compounds by aluminothermy using SHS metallurgy

Archives of Foundry Engineering

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