Synthesis of nanocrystalline materials — an overview

Froes, F. H.; Senkov, O.N.; Baburaj, E.G.

doi:10.1016/s0921-5093(00)01391-5

Cited by 84 publications

(34 citation statements)

References 35 publications

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“…Интенсивной пластической деформацией (кручением) удается получить чрез-вычайно мелкозернистую ГЦК алюминиевую матрицу с гомоген-но распределенными частицами Al 13 Fe 4 . Твердость по Виккерсу (H v ) такого нанокомпозита повышается до 175, что 2,3 раза пре-вышает твердость литого состояния [17]. Последующим отжигом (5 часов при 100С) твердость может быть доведена до H v  302, что говорит о возможности термомеханической обработки таких сплавов.…”

Section: 2unclassified

“…Так, сплавы на основе гамма алюминидов титана рассматривают-ся [17][18][19][20] в качестве замены суперсплавов на основе никеля в различных двигателях и системах термической защиты. Нанок-ристаллические жаропрочные сплавы могут быть использованы, к примеру, как конструкционный материал лопаток турбин тур-бореактивных двигателей, что обеспечивает в среднем на 10% большую прочность и твердость, до 20% большую вязкость раз-рушения до 50% лучшую износостойкость, а нанокристалличе-ские ферромагнитные сплавы систем Fe-Cu-M-Si-B (где М -переходной металл) находят применение в качестве магнитомяг-ких трансформаторных материалов с превосходными магнитны-ми свойствами [21][22][23][24].…”

Section: Introductionunclassified

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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

Section: Introductionunclassified

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

Shevchenko

Stetsenko

2004

Usp. Fiz. Met.

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“…[1][2][3][4][5] Ultrafine-grained materials generally offer high strength coupled with reasonably good fracture ductility and toughness, superplastic properties at moderate temperatures and at high strain rates. SPD techniques are particularly suitable for Al alloys since these cannot be refined below a micrometer-level grain size by traditional thermomechanical methods.…”

Section: Introductionmentioning

confidence: 99%

Aging Behaviour and Mechanical Properties of a Solution Treated and ECAP Processed 6082 Alloy

et al. 2004

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A study was carried out on the aging behaviour of a solution treated 6082 aluminium alloy deformed by equal channel angular pressing up to six passes. Aging of the so obtained ultrafine alloy was studied by DSC and TEM analyses as well as by isothermal treatments at 130, 160 and 180 C. The results showed that the formation of metastable 00 and 0 precipitates were markedly anticipated and that the stable phase was partially suppressed in the alloy processed to 4 and 6 passes, presumably due to anticipated precipitation of Si-rich particles. TEM analyses revealed that a transition in strengthening-precipitate structure occurred in the severely deformed alloy leading to a predominance of globular precipitates over the rod like phases typically found in the undeformed and aged samples. Tensile tests carried out on severely deformed and aged samples allowed to quantify the maximum strength achievable by the 6082 alloy after concurrent grain refinement and peak-hardness aging at 130 C.

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“…As a part of this project, the phase diagram of the Ti-6AI-4V -hydrogen system, and a determination of the stable and metastable phases, which occur in this system, have been defined. Kinetics of the ß phase decomposition has been studied and the non-equilibrium TTT (temperature-time-transformation) diagrams of the beta to alpha+beta+hydride transformation have been determined for the alloys with 10,20, and 30 at.% hydrogen. Kinetics of decomposition of martensite structures have also been determined for these three hydrogen concentrations.…”

mentioning

confidence: 99%

“…In order to fully define the effect of heat treatment on the hydrogenated alloy, non-equilibrium TTT-diagrams are required at different hydrogen concentrations. However, only one TTT diagram for beta-phase decomposition (ß-TTT diagram) is available, that for the alloy with 40 at.% hydrogen [J], However the authors themselves [10] have questioned the validity of the results. The present project was aimed at a detailed understanding of the effect of hydrogen as an alloying element on equilibrium and nonequilibrium phase transformations and microstructural evolution in various Ti-6AI-4V product forms.…”

mentioning

confidence: 99%

Enhanced Performance Near Net Shape Titanium Alloys by Thermohydrogen Processing

Froes¹,

Senkov²,

Qazi³

2001

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Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302, and The views, opinions and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position, policy or decision, unless so designated by other documentation. This is a final report and it covers the work reported in interim reports and work done during this calendar year. This research program was aimed at a detailed understanding of the effect of hydrogen as a temporary alloying element (thermohydrogen processing, THP) on processing parameters, microstructural modifications and final mechanical properties of castand-wrought (ingot metallurgy), powder metallurgy and cast titanium alloys. Fundamental results have been obtained which can now be used to develop optimum THP steps to refine the microstructure and improve the mechanical properties of titanium alloys. As a part of this project, the phase diagram of the Ti-6AI-4V -hydrogen system, and a determination of the stable and metastable phases, which occur in this system, have been defined. Kinetics of the ß phase decomposition has been studied and the non-equilibrium TTT (temperature-time-transformation) diagrams of the beta to alpha+beta+hydride transformation have been determined for the alloys with 10, 20, and 30 at.% hydrogen. Kinetics of decomposition of martensite structures have also been determined for these three hydrogen concentrations. The results have been presented at international meetings, twenty-two technical papers were published and twelve papers have been submitted for publication. Additionally a patent was also awarded. The results of the work have been transitioned to an Army SBIR program designed to produce low cost titanium components for armored vehicles. ABSTRACT This research program was aimed at a detailed understanding of the effect of hydrogen as a temporary alloying element (thermohydrogen processing, THP) on processing parameters, microstructural modifications and final mechanical properties of castand-wrought (ingot metallurgy), powder metallurgy and cast titanium alloys. Fundamental results have been obtained which can now be used to develop optimum THP steps to refine the microstructure and improve the mechanical properties of titanium alloys. As a part of this project, the phase diagram of the Ti-6AI-4V -hydrogen system, and a determination of the stable and metastable phases, which occur in this system, have been defined. Kinetics of the ß phase decomposition has been...

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Synthesis of nanocrystalline materials — an overview

Cited by 84 publications

References 35 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

Aging Behaviour and Mechanical Properties of a Solution Treated and ECAP Processed 6082 Alloy

Enhanced Performance Near Net Shape Titanium Alloys by Thermohydrogen Processing

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