Fabrication and Characterization of Nanocrystalline Al–Cu Alloy by Spark Plasma Sintering

Kong, Qingquan; Lian, Lixian; Liu, Ying

doi:10.1080/10426914.2014.941483

Cited by 11 publications

(8 citation statements)

References 23 publications

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“…As previously mentioned, HEBM is one of the main sources of introducing impurities into raw powders. According to the experimental results presented by Kong et al [84], an increment in the milling time from 20 to 40 h can give rise to a decreased relative density of Cu-Al-based sintered samples. Selecting a prolonged milling time results in finer particles and creates favorable conditions for oxidation of Cu powder with decreased relative density.…”

Section: Contamination Contentmentioning

confidence: 95%

A critical review on spark plasma sintering of copper and its alloys

et al. 2021

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Copper and its alloys have been in the service of humankind earlier than any other metal throughout history. In the present review, all aspects of the SPS of copper and its alloys are comprehensively investigated, and their potential effects on the microstructure and properties of alloys are thoroughly reviewed. In this regard, the densification phenomenon during SPS treatment is fully investigated. The effects of raw powder characteristics involving particle size, contamination content, and powder morphology on the sinterability of these materials are examined. Then, the influence of SPS operation parameters consisting of pressure, heating rate, dwelling time, pulsed electrical current, electrical pulses pattern, sintering temperature, and sintering tooling on densification of these materials is extensively discussed. Furthermore, the microstructure evolution and grain growth behaviors during SPS are explored. In addition, current challenges and future perspectives of this field are addressed.

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Section: Contamination Contentmentioning

confidence: 95%

A critical review on spark plasma sintering of copper and its alloys

et al. 2021

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“…Проте традиційні методи ливарництва, як правило, обмежені низькими швидкостями кристалізації, що обумовлює значний ріст зерен [12]. В зв'язку з цим, в останні роки значна увага приділяється застосуванню механічного легування (МЛ) елементарних порошків та їх подальшому спіканню в твердому стані (за низьких температур) для виготовлення алюмінієво-мідних композитів, що мають підвищений рівень механічних властивостей [13][14][15][16][17]. Процес МЛ проходить у нерівноважних умовах, що збільшує розчинність компонентів в твердому стані і дозволяє отримати пересичені тверді розчини та інтерметалеві сполуки у вигляді наноструктурованих матеріалів [18].…”

Section: вступunclassified

Structure and Mechanical Properties of Al–Cu/C Composites Produced by Mechanical Alloying and Solid-State Sintering

Matvienko¹,

Поліщук²,

Rud³

et al. 2019

Metallofiz. Noveishie Tekhnol.

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левих фаз. Розглянуто вплив графітових добавок та вмісту Cu (17 і 33% ваг.) на мікроструктуру та механічні властивості спечених композитів Al-Cu. Обговорюються можливі механізми зміцнення композитів Al-Cu і Al-Cu/C. Ключові слова: Al-Cu/C, металоматричні композити, механічне легування, твердофазне спікання, порошкова металургія. Hypoeutectic and eutectic Al-Cu composites with 5% wt. of graphite additives are prepared using mechanical alloying (MA) of elemental powders and following hot pressing of mixtures at 480-510°C and 30 MPa. The obtained powders and sintered samples are studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The MA during 8 hours of all powder compositions results in the formation of Cu 9 Al 4 and CuAl 2 phases as well as Al(Cu) solid solution. Subsequent sintering leads to the decomposition of the metastable Cu 9 Al 4 phase. As shown, the crystalline structure of graphite additives transforms into amorphous one during MA, while the consequent sintering results in the Al 4 C 3 carbide formation. Moreover, the introduction of graphite additives leads to increasing of both the highly dispersed particles amount in mechanically alloyed powder and the volume fraction of metastable Cu 9 Al 4 and stable CuAl 2 intermetallic phases. The effects of both graphite additives and Cu content (17 and 33% wt.) on microstructure and mechanical properties of sintered Al-Cu composites are considered. Possible strengthening mechanisms for Al-Cu and Al-Cu/C composites are discussed.

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“…The yield strength, hardness and engineering strain were 1018 MPa, 1.61 GPa and 14.5%, respectively. Kong et al [22] prepared Al-40wt.% Cu block alloy with a grain size of 200 nm by MA-SPS. The Vickers hardness of the alloy achieved 210 HV.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Nanocrystalline Al-Zn-Mg-Cu Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering

Cheng

Cai

et al. 2019

Materials

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In this study, Al, Zn, Mg and Cu elemental metal powders were chosen as the raw powders. The nanocrystalline Al-7Zn-2.5Mg-2.5Cu bulk alloy was prepared by mechanical alloying and spark plasma sintering. The effect of milling time on the morphology and crystal structure was investigated, as well as the microstructure and mechanical properties of the sintered samples. The results show that Zn, Mg and Cu alloy elements gradually dissolved in α-Al with the extension of ball milling time. The morphology of the ball-milled Al powder exhibited flaking, crushing and welding. When the ball milling time was 30 h, the powder particle size was 2–5 μm. The α-Al grain size was 23.2 nm. The lattice distortion was 0.156% causing by the solid solution of the metal atoms. The grain size of ball-milled powder grew during the spark plasma sintering process. The grain size of α-Al increased from 23.2 nm in the powder to 53.5 nm in the sintered sample during the sintering process after 30 h of ball milling. At the same time, the bulk alloy precipitated micron-sized Al2Cu and nano-sized MgZn2 in the α-Al crystal. With the extension of ball milling time, the compression strength, yield strength and Vickers hardness of spark plasma sintering (SPS) samples increased, while the engineering strain decreased. The compression strength, engineering strain and Vickers hardness of sintered samples prepared by 30 h milled powder were ~908 MPa, ~8.1% and ~235 HV, respectively. The high strength of the nanocrystalline Al-7Zn-2.5Mg-2.5Cu bulk alloy was attributed to fine-grained strengthening, dislocation strengthening and Orowan strengthening due to the precipitated second phase particles.

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Fabrication and Characterization of Nanocrystalline Al–Cu Alloy by Spark Plasma Sintering

Cited by 11 publications

References 23 publications

A critical review on spark plasma sintering of copper and its alloys

A critical review on spark plasma sintering of copper and its alloys

Structure and Mechanical Properties of Al–Cu/C Composites Produced by Mechanical Alloying and Solid-State Sintering

Microstructure and Mechanical Properties of Nanocrystalline Al-Zn-Mg-Cu Alloy Prepared by Mechanical Alloying and Spark Plasma Sintering

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