Optimization of strength and ductility of 2024 Al by equal channel angular pressing (ECAP) and post-ECAP aging

Kim, W.J.; Chung, Chin-Sung; Ma, D.S.; Hong, Sun Ig; Kim, H.K.

doi:10.1016/s1359-6462(03)00260-4

Cited by 234 publications

(99 citation statements)

References 17 publications

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“…It is obvious that only the combination of grain size strengthening with precipitation hardening can significantly affect the strength of these aluminum alloys. The formation of a UFG microstructure significantly affects the size of second-phase precipitations and their distribution within the aluminum matrix [5][6][7][8][9][10]. Therefore, mechanical properties of age-hardenable aluminum alloys subjected to ECAP depend critically on the aging response including precipitation kinetics and sequence, origin of dispersoids and the precipitate morphology.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, despite numerous studies [11][12][13][14][15] dealing with the examination of extensive grain refinement through ECAP on mechanical properties of these precipitation-hardened aluminum alloys, the effect of a UFG microstructure on precipitation sequence under post-deformation aging is relatively poorly known [5,9,[16][17][18]. It was shown that the formation of a UFG microstructure changes the post-deformation aging is relatively poorly known [5,9,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…It was shown that the formation of a UFG microstructure changes the post-deformation aging is relatively poorly known [5,9,[16][17][18]. It was shown that the formation of a UFG microstructure changes the precipitation sequence: stable phases precipitate on high-angle boundaries [5] or even within the aluminum matrix [6] that suppresses the appearance of a metastable phase.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, the achievement of increased yield stress (YS) in age-hardenable aluminum alloys is not a trivial task. A positive effect of ECAP on YS is reported in a limited number of studies [5,[7][8][9]17,19,20]. It is worth noting that in all these works the temperature of final aging was lower in comparison with aging temperature used to achieve optimal YS in their coarse grained (CG) counterparts.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Mogucheva

Kaibyshev

2016

Metals

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Abstract:The effect of post-deformation solution treatment followed by water quenching and artificial aging on microstructure and mechanical properties of an Al-Li-Mg-Sc-Zr alloy subjected to equal-channel angular pressing (ECAP) was examined. It was shown that the deformed microstructure produced by ECAP remains essentially unchanged under solution treatment. However, extensive grain refinement owing to ECAP processing significantly affects the precipitation sequence during aging. In the aluminum-lithium alloy with ultrafine-grained (UFG) microstructure, the coarse particles of the S 1 -phase (Al 2 LiMg) precipitate on high-angle boundaries; no formation of nanoscale coherent dispersoids of the δ -phase (Al 3 Li) occurs within grain interiors. Increasing the number of high-angle boundaries leads to an increasing portion of the S 1 -phase. As a result, no significant increase in strength occurs despite extensive grain refinement by ECAP.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Mogucheva

Kaibyshev

2016

Metals

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“…При этом, прочностные свойства алюминиевого сплава могут быть существенно повышены путем измельчения зеренной структуры методами ИПД [4,5,[7][8][9].…”

Section: Introductionunclassified

Structure and mechanical properties of Al-Cu-Mg alloy after severe plastic deformation

Хафизова¹,

Iskandarova²,

Islamgaliev³

et al. 2015

LoM

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At the present time, ultrafine-grained (UFG) metallic materials produced by severe plastic deformation (SPD) generate great interest. In our work we studied the structural features of ultrafine-grained samples of an Al-Cu-Mg alloy after multiple semi-closed forging (MSF) and equal-channel angular pressing (ECAP) at various temperatures. The mean grain size, as well as the shape and sizes of dispersed precipitates were determined by transmission electron microscopy (TEM). The ultimate tensile strength and elongation to failure of the UFG samples were evaluated by tensile testing. A scanning electron microscopy (SEM) was used to study the fracture surface of the samples after tensile tests. In the ECAP-processed samples, the deformation temperature was lower or equal to the temperature of aging, which resulted in a small grain size of the dispersed particles (30 -70 nm) that contribited to the accumulation of a higer dislocation density and, grain refinement down to 200 -830 nm. In the case of MSF processing, the temperature and time of deformation were significantly higher, which led to coarsening of particles (up to 150 nm and larger) and a larger grain size (630 -980 nm). The role of a grain size and a size of dispersed particles in attaining higher strength in the ECAP-processed samples as compared with the MSF-processed samples is discussed.Keywords: severe plastic deformation, strength, aluminum alloys, ultrafine-grained structure. Структура и механические свойства алюминиевого сплава системы Al-Cu-Mg после интенсивной пластической деформацииХафизова Э.Д. В настоящее время повышенный интерес вызывают ультрамелкозернистые (УМЗ) металлические материалы, полу-ченные методом интенсивной пластической деформации (ИПД). В настоящей работе изучены структурные особен-ности ультрамелкозернистых образцов алюминиевого сплава системы Al-Cu-Mg после всесторонней полузакрытой ковки (ВПК) и равноканального углового прессования (РКУП) при различных температурах. С использованием просвечивающей электронной микроскопии (ПЭМ) определены средний размер зерна, а также форма и размеры дисперсных частиц выделений. Методом механических испытаний на растяжение определены предел прочности (временное сопротивление разрушению) и относительное удлинение до разрушения УМЗ образцов. Для изучения поверхности разрушения образцов после испытаний на растяжение был использован растровый электронный ми-кроскоп (РЭМ). В РКУП образцах температура деформации была меньше или равна температуре старения, что при-вело к малому размеру дисперсных частиц (30 -70 нм), которые способствовали накоплению большей плотности дислокаций и, соответственно, сильному измельчению зеренной структуры до 200 -830 нм. В случае ВПК образцов температура и время деформации были существенно выше, что привело к укрупнению частиц (до 150 нм и более) и, соответственно, к большему размеру зерна (630 -980 нм). Обсуждается роль размера зерен и размера дисперсных частиц в достижении более высоких прочностных свойств в РКУП образцах по сравнению с ВПК образцами.Ключевые слова: инте...

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Fabrication of Nanostructural Aluminum Alloy Powder with Ball Milling Method

Yang¹,

Zheng²,

Yuan³

et al. 2012

ICAA13: 13th International Conference on Aluminum Alloys

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Optimization of strength and ductility of 2024 Al by equal channel angular pressing (ECAP) and post-ECAP aging

Cited by 234 publications

References 17 publications

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Microstructure and Mechanical Properties of an Al-Li-Mg-Sc-Zr Alloy Subjected to ECAP

Structure and mechanical properties of Al-Cu-Mg alloy after severe plastic deformation

Fabrication of Nanostructural Aluminum Alloy Powder with Ball Milling Method

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