Achieving room temperature superplasticity in Zn–5Al alloy at high strain rates by equal-channel angular extrusion

Demirtas, M.; Pürçek, G.; Yanar, H.; Zhang, Z.J.; Zhang, Z.F.

doi:10.1016/j.jallcom.2014.10.111

Cited by 34 publications

(33 citation statements)

References 31 publications

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“…For achieving FG or UFG microstructure and obtain RT and HSR superplasticity in Zn-Al alloys some thermal and thermo-mechanical processes as well as severe plastic deformation (SPD) techniques like equal-channel angular pressing (ECAP) [11,[13][14][15][16][17][18] and friction stir processing (FSP) [12] have been utilized. Previous studies on RT and HSR superplasticity in Zn-Al alloys and the main results achieved are listed in Table 1.…”

Section: Room Temperature Superplasticity Of Zn-al Alloysmentioning

confidence: 99%

“…Regarding the SPD techniques, there is no study aiming to achieve RT superplasticity in dilute Zn-Al alloys. Demirtas et al [11] processed Zn-5Al alloy using ECAP and achieved RT superplasticity in this alloy for the first time. In that study, a bimodal microstructure having 540 nm grain size of Zn-rich grains and 110 nm grain size of Al-rich grains was obtained.…”

Section: Room Temperature Superplasticity Of Zn-al Alloysmentioning

confidence: 99%

“…ECAP was performed following a hot rolling process at 100°C with 35 % reduction in thickness. Eutectic Zn-5Al alloy was processed by 8 passes ECAP at RT [11]. ECAP was applied to Zn-22Al alloy as a two-step process.…”

Section: Effects Of Grain Size and Chemical Composition On Rt Superplmentioning

confidence: 99%

“…All these requirements should be fulfilled so that the grain boundary sliding (GBS) can occur easily as the main deformation mechanism in superplastic region [3]. After the first report in 1912 [4], superplasticity-related studies have been one of the main topics among the material scientists and mechanical engineers, and various classes of materials including alloys [5][6][7][8][9][10][11][12][13][14][15][16][17][18], ceramics [19][20][21] and amorphous materials [22,23] have been addressed for this purpose.…”

Section: Introductionmentioning

confidence: 99%

“…However, it should be noted that it is not possible to achieve RT superplasticity in all UFG or NS materials. RT and HSR superplastic behavior can be achieved in some specific alloys like Sn-Bi [24], Pb-Tl [25], Pb-Sn [26], and Zn-Al [5][6][7][8][9][10][11][12][13][14][15][16][17][18] due to their relatively low melting points. Among them, Zn-Al alloy family is the most suitable one as considering its phase diagram shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Effect of chemical composition and grain size on RT superplasticity of Zn-Al alloys processed by ECAP

Demirtas¹,

Pürçek²,

Yanar³

et al. 2015

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Dilute Zn-0.3Al, eutectic Zn-5Al and eutectoid Zn-22Al alloys were processed by multi-pass equal channel angular pressing (ECAP) in order to achieve fine grained (FG) or ultrafine-grained (UFG) microstructure and room temperature (RT) superplasticity. ECAP refined the microstructure of Zn-0.3Al and resulted in a FG Zn-rich η-matrix with an average grain size of 2 µm and homogeneously distributed nano-sized Al-rich α-particles with the grain sizes in the range of 50-200 nm. A bi-modal microstructure was achieved in Zn-5Al alloy with UFG Al-rich α-and FG Zn-rich η-phases having mean grain sizes of 110 nm and 540 nm, respectively. ECAP brought about an agglomerate-free UFG microstructure in Zn-22Al alloy with an average grain size of 200 nm which is the lowest one obtained so far for this alloy after ECAP processing. The maximum RT superplastic elongations of 1000%, 520% and 400% were achieved for Zn-0.3Al, Zn-5Al and Zn-22Al alloys, respectively. Considering the RT superplasticity in Zn-Al alloys, it was found that lower Al content results in higher superplastic elongations even if the alloy has relatively larger grain size. Grain boundary sliding (GBS) was found to be the main deformation mechanism in region-II as the optimum superplastic region during RT deformation for all three Zn-Al alloys with the strain rate sensitivity factor ranging between 0.25-0.31.Keywords: Zn-Al alloys, room temperature superplasticity, ultrafine-grained materials, equal channel angular pressing Влияние химического состава и размера зерен на сверхпластичность при комнатной температуре сплавов Zn-Al, подвергнутых РКУП Низколегированный сплав Zn-0.3Al, эвтектик Zn-5Al и эвтектоидный сплав Zn-22Al были подвергнуты многопро-ходному равноканальному угловому прессованию (РКУП) с целью получения мелкозернистой (МЗ) или ультрамел-козернистой (УМЗ) структуры и достижения сверхпластичности при комнатной температуре. РКУП привело к из-мельчению микроструктуры Zn-0.3Al и формированию МЗ обогащенной Zn η-матрицы со средним размером зерен 2 мкм и однородно распределенных наноразмерных богатых Al α-частиц с размером в интервале 50-200 нм. В сплаве Zn-5Al была получена бимодальная структура с УМЗ богатой Al α-фазой и МЗ богатой Zn η-фазой, имеющими соответственно размеры зерен 110 нм и 540 нм. В сплаве Zn-22Al РКУП привело к формированию не агломериро-ванной УМЗ микроструктуры со средним размером зерен 200 нм, что представляет собой минимальное достигнутое к настоящему времени значение размера зерен, полученное РКУП на данном сплаве. Для сплавов Zn-0.3Al, Zn-5Al и Zn-22Al были получены максимальные сверхпластические удлинения при комнатной температуре, равные соот-ветственно 1000%, 520% и 400%. По отношению к сверхпластичности сплавов Zn-Al показано, что более низкое содержание Al приводит к более высоким сверхпластическим удлинениям, даже если сплав имеет больший размер зерен. Показано, что зернограничное проскальзывание (ЗГП) является основным механизмом деформации в обла-сти II, являющейся оптимальной областью сверхпластической деформации при комн...

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Section: Room Temperature Superplasticity Of Zn-al Alloysmentioning

confidence: 99%

Section: Room Temperature Superplasticity Of Zn-al Alloysmentioning

confidence: 99%

Section: Effects Of Grain Size and Chemical Composition On Rt Superplmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of chemical composition and grain size on RT superplasticity of Zn-Al alloys processed by ECAP

Demirtas¹,

Pürçek²,

Yanar³

et al. 2015

LoM

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Nano‐ and Micro‐Mechanical Properties of Ultrafine‐Grained Materials Processed by Severe Plastic Deformation Techniques

et al. 2016

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The processing of bulk metals through the application of severe plastic deformation (SPD) provides the potential for achieving exceptional grain refinement leading to ultrafine-grained (UFG) materials. These materials generally exhibit high strength but very limited ductility at room temperature. The recent development in the nanoindentation technique provides significant feasibility in evaluating the micro-mechanical behavior of UFG materials. Accordingly, this review examines the available experimental results showing the enhancement in strength and ductility through nanoindentation analysis in various materials after different SPD techniques. A comprehensive tabulation is also presented listing the available data for the strain rate sensitivity, m, in a variety of UFG metals processed by SPD.

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Enhancing the Damping Behavior of Dilute Zn-0.3Al Alloy by Equal Channel Angular Pressing

Demirtas

Atli

Yanar

et al. 2017

Metall Mater Trans A

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Achieving room temperature superplasticity in Zn–5Al alloy at high strain rates by equal-channel angular extrusion

Cited by 34 publications

References 31 publications

Effect of chemical composition and grain size on RT superplasticity of Zn-Al alloys processed by ECAP

Effect of chemical composition and grain size on RT superplasticity of Zn-Al alloys processed by ECAP

Nano‐ and Micro‐Mechanical Properties of Ultrafine‐Grained Materials Processed by Severe Plastic Deformation Techniques

Enhancing the Damping Behavior of Dilute Zn-0.3Al Alloy by Equal Channel Angular Pressing

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