Microstructural and mechanical properties of AA1100 aluminum processed by multi-axial incremental forging and shearing

Montazeri-Pour, Mehdi; Parsa, Mohammad Habibi; Jafarian, H.R.; Taieban, S.

doi:10.1016/j.msea.2015.05.066

Cited by 41 publications

(11 citation statements)

References 64 publications

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“…4 and 9), even though the total rolling reduction was not huge (91%, ¾ = 2.8). Although the degree of deformation in martensite was much smaller than that in ferrite, it was shown by Ueji et al 34,35) that smaller amount of strain was enough to finely subdivide as-quenched martensite (Fig. 13).…”

Section: Simpler Ways To Fabricate Ultrafine Grained Metals Without Smentioning

confidence: 93%

Formation Mechanism of Ultrafine Grained Microstructures: Various Possibilities for Fabricating Bulk Nanostructured Metals and Alloys

et al. 2019

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Severe plastic deformation (SPD) have had a revolutionary impact in fabricating ultrafine grained (UFG) or nanostructured metallic materials with bulky dimensions. It is, however, difficult to understand from a viewpoint of conventional metallurgy why UFG microstructures form in the as-deformed (as-SPD-processed) state without annealing process. The mechanism of UFG evolution has not yet been perfectly recognized and even some confusions have been induced. Experimental results of systematic observations on the evolution of microstructures during SPD were introduced in the present manuscript, and it was concluded from the results that the formation of UFG microstructures during SPD could be understood in terms of the grain subdivision mechanism. Consequently, the UFG microstructures formed by SPD have the deformed (strain-hardened) characteristics, which influences their mechanical properties. Besides the breakthrough in grain refinement, some features of SPD processes have become barriers for practical applications of UFG materials and scaling-up of the processes. Several new processes combining phase transformation with plastic deformation were introduced for fabricating UFG microstructures without huge plastic strains, and UFG microstructures successfully obtained by the new processes were shown. Finally, recent finding of fully recrystallized UFG microstructures in some alloys having average grain sizes of several hundred nano-meters was exhibited. The fully recrystallized UFG metals all showed both high strength and large ductility, because of the capability of strain hardening in the structures. These recent results are expected to open great possibilities of UFG or nanostructured metals as advanced structural materials. [

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Section: Simpler Ways To Fabricate Ultrafine Grained Metals Without Smentioning

confidence: 93%

Formation Mechanism of Ultrafine Grained Microstructures: Various Possibilities for Fabricating Bulk Nanostructured Metals and Alloys

et al. 2019

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“…As a result, an inhomogeneous grain structure forms in bulk material [21][22][23][24]. The grain structure consists of very fine grains and coarse grains in pure Al subjected to multi-directional forging at room temperature [25,26]. Similar grain bimodalities are observed in many aluminum-based alloys [9,21,[27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 81%

“…The final grain structure and its homogeneity are 2 of 12 significantly affected by the deformation temperature, cumulative strain and alloy composition [2,[7][8][9][10]20]. Montazeri-Pour et al [25] concluded that a high imposed strain per pass by more shear planes with different orientations results in more homogeneous grain fragmentation. Wang et al [32] found that grains were uniformly distributed after MDF at 350 • C with a cumulative strain of 3.6 in an Al-Cu-based alloy, due to the grain structure being stabilized by fine precipitates.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Mikhaylovskaya

Котов

Kishchik

et al. 2019

Metals

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The current study observed a grain structure evolution in the central part and periphery of the sample of an Al–Mg–Mn-based alloy during isothermal multidirectional forging (IMF) at 350 °C with a cumulative strain of 2.1–6.3 and a strain per pass of 0.7. A bimodal grain size distribution with areas of fine and coarse grains was observed after IMF and subsequent annealing. The grain structure, mechanical properties, and superplastic behavior of the samples subjected to IMF with a cumulative strain of 6.3 and the samples exposed to IMF with subsequent cold rolling were compared to the samples exposed to a simple thermo-mechanical treatment. The micro-shear bands were formed inside original grains after the first three passes. The fraction of recrystallized grains increased and the mean size decreased with an increasing cumulative strain from 2.1 to 6.3. Significant improvements of mechanical properties and superplasticity were observed due to the formation of a homogenous fine grain structure 4.8 µm in size after treatment including IMF and subsequent cold rolling.

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“…В ряде случаев сочетание высокой прочности и пла-стичности является необходимым условием для прак-тического применения алюминиевых сплавов. В по-следние годы были проведены исследования влияния интенсивной пластической деформации (ИПД) на меха-нические свойства Al и сплавов на его основе [1][2][3][4][5][6][7][8][9][10]. Было показано, что ИПД приводит к повышению проч-ности и микротвердости за счет измельчения зерен до ультрамелкого масштаба и повышения плотности дефектов кристаллической решетки [1,2,[5][6][7][8], а также за счет формирования особой структуры границ зерен (ГЗ) [1].…”

Section: Introductionunclassified

Влияние отжига на микроструктуру и механические свойства ультрамелкозернистого технически чистого Al

Мавлютов¹,

Латынина²,

Мурашкин³

et al. 2017

Физика Твердого Тела

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Исследовано влияние отжига на микроструктуру и механические свойства ультрамелкозернистого (УМЗ) технически чистого Al, предварительно подвергнутого интенсивной пластической деформации кручением под давлением. Установлено, что отжиг УМЗ-образцов в диапазоне температур 363-473 K в течение 1 h приводит к повышению условного предела текучести и предела прочности, прирост которых достигает максимального значения (до 50 и 30% соответственно) после отжига при 423 K. Обсуждается ключевая роль неравновесных большеугловых границ зерен в полученном эффекте упрочнения УМЗ-Al путем отжига. Увеличение прочности сопровождается значительным снижением пластичности. Предложен новый подход для улучшения пластичности УМЗ-Al при сохранении высокого уровня прочности. Он заключается во введении дополнительной плотности дислокаций в релаксированную отжигом УМЗ-структуру. Авторы (М.Ю.М. и Р.З.В.) выражают благодарность Министерству образования и науки РФ за финансовую поддержку в рамках проекта N 14.Б25.31.0017. Рентгеноструктурные исследования проведены с использованием оборудования Ресурсного центра научного парка СПбГУ "Рентгенодифракционные методы исследования". DOI: 10.21883/FTT.2017.10.44964.094

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Microstructural and mechanical properties of AA1100 aluminum processed by multi-axial incremental forging and shearing

Cited by 41 publications

References 64 publications

Formation Mechanism of Ultrafine Grained Microstructures: Various Possibilities for Fabricating Bulk Nanostructured Metals and Alloys

Formation Mechanism of Ultrafine Grained Microstructures: Various Possibilities for Fabricating Bulk Nanostructured Metals and Alloys

The Effect of Isothermal Multi-Directional Forging on the Grain Structure, Superplasticity, and Mechanical Properties of the Conventional Al–Mg-Based Alloy

Влияние отжига на микроструктуру и механические свойства ультрамелкозернистого технически чистого Al

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