High Strain Rate Superplasticity in a Zr and Sc Modified 7075 Aluminum Alloy Produced by ECAP

Turba, K.; Málek, P.; Rauch, E.F.; Cieslar, Miroslav

doi:10.4028/www.scientific.net/msf.584-586.164

Cited by 11 publications

(12 citation statements)

References 9 publications

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“…6). Similarly to other microcrystalline Al-based alloys [18,19], the presence of Al 3 (Sc,Zr) phase particles has a positive stabilizing effect on the microcrystalline structure.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and deformation behaviour of the ECAP Al-Mn-Sc-Zr alloy

MALEK¹,

Cieslar²

2021

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The Al-Mn alloy stabilized by the addition of Sc and Zr was subjected to equal-channel angular pressing (ECAP) at room temperature. The microstructure evolution as a function of the number of ECAP passes was studied by transmission electron microscopy. The room temperature strength was characterized by microhardness measurements and tensile tests. The stability of the very fine-grained microstructure and strength characteristics were studied at elevated temperatures. Due to a good microstructure stability even after annealing at 500• C the possibility of superplastic behaviour was tested. The value of the strain rate sensitivity parameter m exceeding the bottom limit of superplastic behaviour was found.K e y w o r d s : Al-alloys, ECAP, microstructure, mechanical properties, superplasticity

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“…6). Similarly to other microcrystalline Al-based alloys [18,19], the presence of Al 3 (Sc,Zr) phase particles has a positive stabilizing effect on the microcrystalline structure.…”

Section: Discussionmentioning

confidence: 99%

Microstructure and deformation behaviour of the ECAP Al-Mn-Sc-Zr alloy

MALEK¹,

Cieslar²

2021

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“…[22] A careful inspection of the literature shows that the strategy followed in the majority of SPD-processed Al alloys to stabilize the microstructure at high temperature is to add small amounts of elements such as Sc and Zr. [23][24][25] A fine dispersion of Al 3 Sc and/or Al 3 Zr formed during casting acts as an inhibitor of grain growth at high temperatures. Consequently, high strain rate superplasticity (HSRS) has been observed at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, there have been only a limited number of reports on the pressing of more complex alloys, such as Al-Zn-Mg-(Cu) alloys, where aging treatments and precipitation kinetics become important features of the processing method. [23][24][25][26][27][28][29][30][31][32] In practice, these alloys are often difficult to process by ECAP at room temperature because of their very limited formability.…”

Section: Introductionmentioning

confidence: 99%

Influence of Processing Severity During Equal-Channel Angular Pressing on the Microstructure of an Al-Zn-Mg-Cu Alloy

Cepeda-Jiménez¹,

García-Infanta²,

Rauch

et al. 2012

Metall Mater Trans A

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A commercial Al-Zn-Mg-Cu alloy, Al 7075, was overaged at 553 K (280°C) for 5 hours and processed by equal-channel angular pressing (ECAP) using route B C . Different temperatures and number of passes, which determine the processing severity, were considered. The processing severity has been estimated by the maximum stress (r Proc ) recorded during each ECAP pass. The higher the number of passes or the lower the processing temperature, i.e., the higher is the processing severity, the finer the (sub)grain size is obtained. A minimum ultrafine (sub)grain size of approximately 150 nm after three passes at 353 K (80°C) or eight passes at 403 K (130°C) was obtained. The microhardness exhibited an instant increase from 76 HV for the overaged initial state to 115 HV after only the first pass. The coarsened precipitates in the overaged alloy lead to larger structural refinement than in pure aluminum.

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“…The grain size after four ECAP passes is about 400 nm, i.e. , slightly lower in comparison with ECAP Al-Zn-based [ 23 ] or Al-Mg-based alloys [ 24 ]. However, after four ECAP passes the microstructure still contains numerous low-angle boundaries (about 60%) [ 13 ].…”

Section: Discussionmentioning

confidence: 99%

High Temperature Deformation of Twin-Roll Cast Al-Mn-Based Alloys after Equal Channel Angular Pressing

2015

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Twin roll cast Al-Mn- and Al-Mn-Zr-based alloys were subjected to four passes of equal channel angular pressing. The resulting grain size of 400 nm contributes to a significant strengthening at room temperature. This microstructure is not fully stable at elevated temperatures and recrystallization and vast grain growth occur at temperatures between 350 and 450 °C. The onset of these microstructure changes depends on chemical and phase composition. Better stability is observed in the Al-Mn-Zr-based alloy. High temperature tensile tests reveal that equal channel angular pressing results in a softening of all studied materials at high temperatures. This can be explained by an active role of grain boundaries in the deformation process. The maximum values of ductility and strain rate sensitivity parameter m found in the Al-Mn-Zr-based alloy are below the bottom limit of superplasticity (155%, m = 0.25). However, some features typical for superplastic behavior were observed—the strain rate dependence of the parameter m, the strengthening with increasing grain size, and the fracture by diffuse necking. Grain boundary sliding is believed to contribute partially to the overall strain in specimens where the grain size remained in the microcrystalline range.

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High Strain Rate Superplasticity in a Zr and Sc Modified 7075 Aluminum Alloy Produced by ECAP

Cited by 11 publications

References 9 publications

Microstructure and deformation behaviour of the ECAP Al-Mn-Sc-Zr alloy

Microstructure and deformation behaviour of the ECAP Al-Mn-Sc-Zr alloy

Influence of Processing Severity During Equal-Channel Angular Pressing on the Microstructure of an Al-Zn-Mg-Cu Alloy

High Temperature Deformation of Twin-Roll Cast Al-Mn-Based Alloys after Equal Channel Angular Pressing

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