Microstructural characteristics and superplastic-like behavior in aluminum powder alloy consolidated by equal-channel angular pressing

Matsuki, Kenji; Aida, Tetsuo; Takeuchi, Takayuki; Kusui, Jun; Yokoe, Kazuhiko

doi:10.1016/s1359-6454(00)00061-6

Cited by 65 publications

(26 citation statements)

References 11 publications

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“…Метод интенсивной пластической деформации применяется для получения СМК структур таких металлов, как медь [54], ти-тан [55] и других, а так же сплавов и интерметаллических со-единений на основе алюминия [56][57][58], магния и титана [59,60]. Формирование деформационными методами СМК структуры по-зволяет создавать удобные модельные объекты для эксперимен-тальных исследований межкристаллитных границ благодаря применимости к ним апробированных методов металлофизики и физики твердого тела [61,62].…”

Section: 2unclassified

Nanoscale States in Metals, Alloys, and Intermetallic Compounds: Methods of Manufacture, Structure, Properties

Shevchenko

Stetsenko

2004

Usp. Fiz. Met.

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Наноструктурные металлические материалы, обладающие уникальны-ми свойствами благодаря характерному структурному размеру, сопос-тавимому с межатомными расстояниями в кристалле, нашли широкое применение и являются основой многих современных технологий. Цель данного обзора -представить общую картину исследований наност-руктурных состояний в компактных металлах, сплавах и интерметал-лидах, охарактеризовать основные методы получения компактных на-ноструктурных материалов, особенности их структуры и свойств. Так же кратко представлены основные модели, объясняющие особенности строения и аномальные свойства металлов и сплавов в нанокристалли-ческом состоянии.Наноструктурні металічні матеріали, що мають унікальні властивості завдяки характерному структурному параметру, співставимому із мі-жатомними відстанями у кристалі, знайшли широке застосування та є основою багатьох сучасних технологій. Мета цього огляду -предста-вити загальну картину досліджень наноструктурних станів у компакт-них металах, сплавах та інтерметалічних сполуках, дати характерис-тику основних методів отримання компактних наноструктурних мате-ріалів, їх властивостей та структурних особливостей. Також стисло представлено основні моделі, що пояснюють особливості будови та ано-мальні властивості металів та сплавів у нанокристалічному стані. Nanocrystalline metallic materials have been recognized as perspective materials for a wide range of modern technologies due to their unique properties, occurring because of their mainly structural parameters, which are comparable with the interatomic distances. This review objective is to characterize the current state of art in investigation of the nanoscale metals, alloys, and intermetallic compounds. Basic methods for preparing compact nanocrystalline materials are discussed. Recent results Успехи физ. мет. / Usp. Fiz. Met. 2004, т. 5, сс. 219-255 Îòòèñêè äîñòóïíû íåïîñðåäñòâåííî îò èçäàòåëÿ Ôîòîêîïèðîâàíèå ðàçðåøåíî òîëüêî â ñîîòâåòñòâèè ñ ëèöåíçèåé  2004 ÈÌÔ (Èíñòèòóò ìåòàëëîôèçèêè èì. Ã. Â. Êóðäþìîâà ÍÀÍ Óêðàèíû) Íàïå÷àòàíî â Óêðàèíå.

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Section: 2unclassified

Nanoscale States in Metals, Alloys, and Intermetallic Compounds: Methods of Manufacture, Structure, Properties

Shevchenko

Stetsenko

2004

Usp. Fiz. Met.

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“…Many SPD techniques, such as equal channel angular pressing (ECAP), [2][3][4][5][6] high-pressure torsion (HPT), [7] and accumulative roll bonding (ARB), [8,9] were applied for processing of bulk or sheet-shaped UFG materials. These methods are, however, incapable of processing tubular-shaped parts.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Ultra-fine-Grained Al-Mg-Si Tubes Produced by Parallel Tubular Channel Angular Pressing Process

Faraji

Roostae

Nosrati

et al. 2015

Metall Mater Trans A

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In the present work, commercial Al-6061 alloy tubes were processed via multi-pass parallel tubular channel angular pressing (PTCAP). The effects of the number of passes on grain refinement and mechanical properties were investigated. The microstructural evolution was characterized using electron back-scattered diffraction (EBSD) and scanning electron microscopy. The mechanical properties were evaluated using tensile tests and hardness measurements. The EBSD analyses presented that the elongated subgrains or grains with~800 nm in size and a high fraction of low-angle grain boundaries were formed after two PTCAP passes. After four passes, the elongated subgrains have transformed to almost equiaxed grains with~400 nm in size and high-angle grain boundaries. Microhardness of the processed tube increased from 38.9 to 63.4 HV (~63 pct) after three PTCAP passes. An increase in the number of PTCAP passes after three passes has no more effect on the microhardness. Yield and ultimate tensile strength were increased by 2.1 and 1.6 times, respectively, after four PTCAP passes (e~6.4) compared to the annealed sample. Ductile fracture with an extensive necking zone and many big dimples occur in the annealed sample, while fine dimples and limited ductile fracture features were observed in the ultra-fine grained PTCAP-processed samples.

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“…Single and multiple ECAP passes have been used to process aluminium alloys [12][13][14][15][16][17][18][19][20]. It is important to note that more than 70% of the enhancement in strength levels and hardness values are achieved in aluminum alloys after a single ECAP pass [20].…”

Section: Introductionmentioning

confidence: 99%

Identification of the Critical Pore Sizes in Sintered and Ecaped Aluminium 6XXX Alloy

Bidulská¹,

Kvačkaj²,

Pokorný³

et al. 2013

Archives of Metallurgy and Materials

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The main aim of this paper is to investigate, by means of comparison of experimental studies and mathematical models, the evolution of porosity as consequence of pressing, sintering and ECAPping an aluminium based powder (6xxx). After applying the compacting pressure, specimens were dewaxed in a ventilated furnace at 400• C for 60 min. Sintering was carried out in a vacuum furnace at 610• C for 30 min. The specimens were then ECAPed for 1 pass. The 2-dimensional quantitative image analysis was carried out by means of SEM and OM for the evaluation of the aforementioned characteristics. Results show the effect of processing parameters on the fracture/microstructure behaviour of the studied aluminium PM alloy. Quantitative image analysis, as well as fractographic interpretation and microstructure identification of weak sites in the studied aluminium PM alloy, provide a reliable and reproducible statistical procedure for the identification of the critical pore sizes.Keywords: aluminium alloy, ECAP, porosity, critical pore sizes, microstructure, fracture Głównym celem pracy jest badanie zmian porowatości podczas prasowania, spiekania i wyciskania przez kanał kątowy proszku na bazie aluminium (Ai-Mg-Si-Cu-Fe) za pomocą eksperymentu i symulacji numerycznych. Po przyłożeniu ciśnienia podczas zagęszczania usuwano lepiszcze z próbek w piecu w temperaturze 400• C przez 60 minut. Spiekanie prowadzono w piecu próżniowym w temperaturze 610• C przez 30 min. Próbki następnie były wyciskane przez kanał kątowy w jednym przejściu. Dwuwymiarową ilościową analizę obrazu przeprowadzono za pomocą skaningowej mikroskopii elektronowej i mikroskopii optycznej w celu oceny wyżej wymienionych właściwości. Wyniki opisują wpływ parametrów procesu na pęka-nie/mikrostrukturę badanego proszku stopu aluminium. Ilościowa analiza obrazu, jak również mikrostruktury w badanym stopie proszku aluminium zapewniają wiarygodne i statystycznie powtarzalne procedury dla identyfikacji miejsc inicjacji pękania.

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Microstructural characteristics and superplastic-like behavior in aluminum powder alloy consolidated by equal-channel angular pressing

Cited by 65 publications

References 11 publications

Nanoscale States in Metals, Alloys, and Intermetallic Compounds: Methods of Manufacture, Structure, Properties

Nanoscale States in Metals, Alloys, and Intermetallic Compounds: Methods of Manufacture, Structure, Properties

Microstructure and Mechanical Properties of Ultra-fine-Grained Al-Mg-Si Tubes Produced by Parallel Tubular Channel Angular Pressing Process

Identification of the Critical Pore Sizes in Sintered and Ecaped Aluminium 6XXX Alloy

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