Study of Cryogenic Rolling of FCC Metals with Different Stacking Fault Energies

Maeda, Milene Yumi; Quintero, John Jairo; Izumi, Marcel Tadashi; Hupalo, Márcio Ferreira; Cintho, Osvaldo Mitsuyuki

doi:10.1590/1980-5373-mr-2017-0054

Cited by 17 publications

(5 citation statements)

References 19 publications

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“…In the alloy performed by ECAP+CR (Figure 4c) condition, a structure of α-Mg grains was also observed with sizes from 0.5 to 2 μm, which was larger than the samples processed by ECAP+LTR. This feature can be understood by considering that the LTR processing may have promoted a significant increase in dislocation density accompanied by lower stacking fault energy due to dynamic recovery suppression at low temperature 25,47 , thus facilitating deformation 48 and, consequently, more intense grain refinement. Figure 5 shows bright field (BF) and dark field (DF) TEM images with Selected Area Electron Diffraction pattern (SAED) for the pure Mg and ZK60+2.5Mm alloy after ECAP+LTR.…”

Section: Resultsmentioning

confidence: 99%

Magnesium Alloys for Hydrogen Storage Processed by ECAP Followed by Low Temperature Rolling

et al. 2022

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The hydrogen storage properties of pure magnesium and magnesium ZK60 alloy containing 2.5 wt% of mischmetal (Mm) processed by Cold Rolling (CR) and Low Temperature Rolling (LTR) were investigated. Before CR and LTR processing, Equal Channel Angular Pressing (ECAP) was employed in the alloys as an initial processing step to refine their microstructures. Microstructure findings showed that the ECAP+LTR route is more effective than the others to generate grain refinement -a desirable aspect in hydrogen storage materials. SEM and TEM results in combination with XPS analysis revealed that the ZK60 + 2.5 wt. % Mm alloy after being processed by ECAP + LTR had more refined grains (with sizes < 1μm) and exhibited superior resistance to the formation of oxides and/or hydroxides when compared with the pure magnesium alloy. The refined microstructures of the ECAP+LTR samples combined with the presence of highly oriented grains along to the (002) plane and large amount of defects -which are features associated to the LTR route -such as cracks and voids, resulted in a fast activation kinetics than for the samples processed by ECAP + CR route.

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Section: Resultsmentioning

confidence: 99%

Magnesium Alloys for Hydrogen Storage Processed by ECAP Followed by Low Temperature Rolling

et al. 2022

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“…Self-annealing phenomena depend not only on material properties, such as pure metals/alloys or low/high melting point, but also on strain, strain rate, stacking fault energy, and deformation temperature [1]. Self-annealing can also decrease the micro-hardness values, which were reported for CR FCC materials [4,6].…”

Section: Introductionmentioning

confidence: 85%

Self-Annealing Phenomena in the Cold-Rolled and Cryo-Rolled Copper Alloys: A Review

Gupta,

Choi

2023

J. Phys.: Conf. Ser.

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Severely deformed copper (Cu) alloys showed the self-annealing behaviour when exposed at room temperature (RT) for a prolonged time. This phenomenon results in the evolution of self-annealed grains, dislocations annihilations, and a decrease in the strength. The present review work addresses the evolution of self-annealed microstructures in room-temperature-rolled (RTR) and cryogenic-rolled (CR) Cu alloys, including various grades of Cu alloys such as ETP Cu, Cu-Fe-P, Cu-Sn-Mg alloys that were studied in terms of RT softening. Static recrystallization (SRX) at room temperature (RT) was observed in the highly deformed RTR and CR Cu alloy samples. Both discontinuous SRX (DSRX) and continuous SRX (CSRX) were responsible for the nucleation of small grains at RT. Particle-stimulated nucleation (PSN) also contributed to small-grain formations around Cu2O particles in ETP Cu. However, no PSN was reported for the Cu-Fe-P and Cu-Sn-Mg alloys. The formation of strain localizations (SLs) and shear bands (SBs) was observed in the deformed Cu alloys; these sites were preferred for grain nucleation during RT recrystallization.

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“…The ways to maintain low homologous temperature during SPD processing are (i) processing at low temperatures (e.g., cryogenic rolling at liquid nitrogen temperature) and (ii) processing materials with high melting points [18]. The maximum dislocation density in an SPD-processed material has a strong dependence on the SFE [90][91] and the melting temperature. The thermally activated (cross-slip and climb) processes of dislocation annihilation can explain the dependence of saturation dislocation density on the melting point of the processed materials.…”

Section: Microstructural and Mechanical Properties Of Hpt-processed M...mentioning

confidence: 99%

Microstructure and Mechanical Behavior of Ultrafine-grained Ni-Mo Alloys Processed by Top-Down and Bottom-Up Methods

Kapoor¹

2019

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Study of Cryogenic Rolling of FCC Metals with Different Stacking Fault Energies

Cited by 17 publications

References 19 publications

Magnesium Alloys for Hydrogen Storage Processed by ECAP Followed by Low Temperature Rolling

Magnesium Alloys for Hydrogen Storage Processed by ECAP Followed by Low Temperature Rolling

Self-Annealing Phenomena in the Cold-Rolled and Cryo-Rolled Copper Alloys: A Review

Microstructure and Mechanical Behavior of Ultrafine-grained Ni-Mo Alloys Processed by Top-Down and Bottom-Up Methods

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