Influence of Si and B on Structure and Corrosion Properties of Quasi-Crystalline Al–Cu–Fe Alloys in Solutions of Salts

Sukhova, O. V.; Polonskyy, Volodymyr А.; Ustinоvа, K. V.

doi:10.15407/mfint.40.11.1475

Cited by 17 publications

(7 citation statements)

References 10 publications

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“…The interest also is prompted due to the finding of quasicrystalline phases of the above alloys when they are cast under conventional solidification techniques. Quasicrystals have many attractive properties, such as high hardness, low electrical and thermal conductivities, low surface energy, accompanied by a low coefficient of friction, reasonable oxidation and strong corrosion resistance, and unusual optical properties which have not been observed for crystalline alloys [9][10][11][12][13]. These properties can only be used for technological applications in the form of thin film coatings [14][15][16][17][18] or reinforcement particles in metal matrix composites [19][20][21][22][23] in order to circumvent their intrinsic brittleness.…”

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confidence: 99%

Structure And Corrosion of Quasicrystalline Cast Al–Co–Ni and Al–Fe–Ni Alloys in Aqueous NaCl Solution

2020

EEJP

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In this work the structure and corrosion behavior of quasicrystalline cast Al69Co21Ni10 and Al72Fe15Ni13 alloys in 5-% sodium chloride solution (рН 6.9–7.1) were investigated. The alloys were cooled at 5 К/s. The structure of the samples was studied by methods of quantitative metallography, X-ray analysis, and scanning electron microscopy. Corrosion properties were determined by potentiodynamic method. Stationary potential values were measured by means of long-term registration of (Е,τ)–curves using ПІ–50–1 potentiostat and ПР–8 programmer with three-electrode electrolytic cell. A platinum electrode served as counter electrode and silver chloride – as reference electrode. The made investigations confirm the formation of stable quasicrystalline decagonal D-phase in the structure of Al69Co21Ni10 and Al72Fe15Ni13 alloys. In Al69Co21Ni10 alloy, at room temperature D-phase coexists with crystalline Al9(Co,Ni)2 phase, and in Al72Fe15Ni13 alloy – with Al5FeNi phase. Comparison of Vickers hardness of these phases exhibits the following sequence: H(D-AlCoNi)>H(D-AlFeNi)>H(Al5FeNi)>H(Al9(Co,Ni)2). In 5-% sodium chloride solution, the investigated alloys corrode under electrochemical mechanisms with oxygen depolarization. Compared with Al72Fe15Ni13 alloy, Al69Co21Ni10 alloy has more negative value of stationary potential (–0,40 V and –0,48 V, respectively), and its electrochemical passivity region extends due to the inhibition of anodic processes. For both alloys, transition to passive state in the saline solution is observed. A corrosion current density, calculated from (E,lgi)-curve, for Al69Co21Ni10 alloy amounts to 0.12 mА/сm2 and for Al72Fe15Ni13 alloy – to 0.14 mА/сm2. After immersion in the saline solution for 8 days, pits are revealed on the surface of the alloys in areas, mainly where the phase boundaries and flaws are located. The number and size of pits are smaller on the surface of Al69Co21Ni10 alloy as compared with those on the surface of Al72Fe15Ni13 alloy. The lower corrosion resistance of Al72Fe15Ni13 alloy may be explained by the presence of iron-containing phases in its structure. Based on obtained results, the Al69Co21Ni10 alloy has been recommended as coating material for rocket-and-space equipment working in marine climate.

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Structure And Corrosion of Quasicrystalline Cast Al–Co–Ni and Al–Fe–Ni Alloys in Aqueous NaCl Solution

2020

EEJP

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“…Copper-containing alloys have gained a variety of applications because of their specific characteristics [1,2]. These materials exhibit high mechanical strength at elevated temperatures, good oxidation resistance as well as high corrosion resistance [3][4][5][6]. Their usage extends from mechanically and thermally highly stressed parts [7] to corrosion-resistant coatings [8][9][10].…”

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confidence: 99%

The The effect of iron on precipitation hardening in the Cu-Ni-Mn alloys

Sukhova

2021

Phys. Chem. Solid St.

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The peculiarities in the structure and properties formation of precipitation-hardened Сu–Ni–Mn–Fe alloys within the concentration range of Ni (19.3–21.0 %), Mn (19.5–20.5 %), Fe (0.6–2.7 %), Cu – balance (in wt. %) were investigated in this work. The methods of quantitative metallography, X-ray analysis, scanning electron microscopy, energy-dispersive spectroscopy and differential thermal analysis were applied. Two solid solutions based on a-Cu differing in composition and hardness were found in the structure of the cast Сu–Ni–Mn–Fe alloys. The temperature ranges of solutions’ formation were determined as (1010±10) °С and (890±10) °С, correspondingly. NiMn phase was also formed at (405±15) °С due to precipitation hardening. In the Сu–Ni–Mn–Fe alloys annealed at 500 and 900 °С for 60–750 hours, the volume fraction and size of NiMn precipitates increased with prolonging annealing time and lowering annealing temperature. As iron content was raised up to 2.7 wt. %, the density of NiMn precipitates increased, especially during first 60 hours of annealing at 900 °С. By adding iron, oxidation resistance was improved, but melting temperature and fluidity did not yield any significant change. Hardness of the Сu–Ni–Mn–Fe alloys with higher iron contents increased by 10 НRB on average. However, when test temperature was raised up to 400 °С, tensile strength decreased (by ~1.3 times) and elongation dropped markedly (by ~10 times).

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“…В последние годы особое внимание уделяют созданию композиционных материалов, упрочненных квазикристаллическими сплавами-наполнителями [8]. Интерес вызван уникальными свойствами, присущими квазикристаллам, такими как высокие твердость и износостойкость, сверхнизкие значения коэффициента трения и стойкость к действию коррозионных сред [8][9][10]. Кроме того, использование квазикристаллических сплавов в качестве наполнителей композиционных материалов помогает устранить их основной недостаток -повышенную хрупкость.…”

Section: Introductionunclassified

Peculiarities of Quasicrystalline Al$_{72}$Co$_{18}$Ni$_{10}$ and Al$_{65}$Co$_{20}$Cu$_{15}$ Fillers Dissolution during Composites Impregnation Process with Brass-Binder

Sukhova¹,

Syrovatko²

2019

Metallofiz. Noveishie Tekhnol.

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В работе исследована структура квазикристаллических сплавов Al 65 Co 20 Cu 15 и Al 72 Co 18 Ni 10 , а также композиционных материалов на их основе, полученных методом печной пропитки. Использованы методы металлографического, рентгеноструктурного, электронно-микроскопического и микрорентгеноспектрального анализов. В сплаве Al 65 Co 20 Cu 15 квазикристаллическая декагональная фаза сосуществует с кристаллическими фазами Al 4 (Co, Cu) 3 и Al 3 (Cu, Co) 2 , а в сплаве Al 72 Co 18 Ni 10-с фазами Al 9 (Co 1−х Ni х) 2 и Al 9 (Ni 1−х Co х) 2. Содержание квазикристаллической фазы в сплавах колеблется в пределах 60-65% об. С помощью оригинальной методики автоматизированного структурного анализа построены кривые распределения коэффициентов поглощения света, использованные для расчёта энтропии фаз. В ходе пропитки латунной связкой марки Л62 гранул наполнителей, изготовленных из сплавов Al 65 Co 20 Cu 15 или Al 72 Co 18 Ni 10 , расплавленная связка растворяет кристаллические фазы наполнителя, проникая до центра гранул. При этом квазикристаллическая фаза наполнителей растворяется с гораздо меньшей скоростью. В структуре композиционного материала, упрочнённого сплавомнаполнителем Al 65 Co 20 Cu 15 , содержание квазикристаллической фазы на 15% об. превышает содержание этой фазы в композиционном материале с

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Influence of Si and B on Structure and Corrosion Properties of Quasi-Crystalline Al–Cu–Fe Alloys in Solutions of Salts

Cited by 17 publications

References 10 publications

Structure And Corrosion of Quasicrystalline Cast Al–Co–Ni and Al–Fe–Ni Alloys in Aqueous NaCl Solution

Structure And Corrosion of Quasicrystalline Cast Al–Co–Ni and Al–Fe–Ni Alloys in Aqueous NaCl Solution

The The effect of iron on precipitation hardening in the Cu-Ni-Mn alloys

Peculiarities of Quasicrystalline Al$_{72}$Co$_{18}$Ni$_{10}$ and Al$_{65}$Co$_{20}$Cu$_{15}$ Fillers Dissolution during Composites Impregnation Process with Brass-Binder

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