Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion

Hanna, Abdelkader; Azzeddine, Hiba; Lachhab, Rabeb; Baudin, Thierry; Helbert, Anne‐Laure; Brisset, François; Huang, Yi; Bradai, Djamel; Langdon, Terence G.

doi:10.1016/j.jallcom.2018.11.109

Cited by 39 publications

(45 citation statements)

References 58 publications

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“…The objective of the present study was to evaluate the effect of annealing temperature on the thermal stability, and specifically on the microstructure, texture and mechanical properties, of an Mg-0.41Dy alloy after processing by HPT for up to 5 turns. An earlier study reported the mechanical properties, deformation microstructures and texture of the same Mg-0.41Dy alloy after processing by HPT through 1/4 to 15 turns [8].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…history were given earlier [8]. After HPT processing, samples were annealed at 200 and 400 °C for 1 h in a radiation furnace under argon gas.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…3. Practically, the grain refinement mechanism in hexagonal close-packed (HCP) metals occurs through a dynamic recrystallization process [1,8]. The OIM maps show that after annealing at 200 and 400 °C for 1 h the grain size undergoes a relatively small increase (Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Severe plastic deformation (SPD) techniques such as equal-channel angular pressing (ECAP) and especially high-pressure torsion (HPT) have proven effective in producing ultrafine-grained (UFG) microstructure down to the sub-micrometer level in several Mgbased alloys [1][2][3][4][5][6][7][8][9]. Furthermore, HPT processing generally produces smaller grains sizes than ECAP processing due to the imposition of higher strains [10].…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it was demonstrated that texture strengthening makes a significant contribution to the rapid increase in hardness in the early stages of deformation [8,19]. Recent investigations have demonstrated that grain refinement plays a more significant role than dislocation strengthening since the dislocation density saturates earlier than the grain size and grain refinement continues even after the saturation of the dislocation density [16,18].…”

Section: Introductionmentioning

confidence: 99%

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An investigation of the thermal stability of an Mg Dy alloy after processing by high-pressure torsion

Hanna

Azzeddine

Huang

et al. 2019

Materials Characterization

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Section: Accepted Manuscriptmentioning

confidence: 99%

“…history were given earlier [8]. After HPT processing, samples were annealed at 200 and 400 °C for 1 h in a radiation furnace under argon gas.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An investigation of the thermal stability of an Mg Dy alloy after processing by high-pressure torsion

Hanna

Azzeddine

Huang

et al. 2019

Materials Characterization

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Faceting of Twin Grain Boundaries in High‐Purity Copper Subjected to High Pressure Torsion

et al. 2019

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The microstructure of high‐purity 5N5 copper processed by high pressure torsion (HPT) is studied. Close to the top and bottom surfaces of HPT disk, the 2–10 μm‐thick ultrafine‐grained layers with equiaxial grains and grain size of about 150 nm are formed. This grain size is typical for HPT of copper and its alloys. However, the remaining bulk layer in the HPT disk contained mainly elongated intersecting twins with high aspect ratio and length of up to 1 μm. These twin grain boundaries (GBs) are faceted. The geometry of the GB facets is analyzed using Σ3 coincidence site lattice (CSL). The Σ3 twins after HPT contained (100)CSL, (110)CSL, (010)CSL, and non‐CSL 9R facets, but not (120)CSL and (130)CSL facets. Earlier, the stability diagram for the Σ3 GB facets is experimentally constructed for the same 5N5 high‐purity copper. The comparison of the data with this diagram allows to estimate for the first time the effective temperature of pure copper during HPT processing at room temperature (RT): Teff = 920 ± 50 K. In other words, the HPT at RT results in Σ3 GB facets as if the sample is annealed at Teff = 920 ± 50 K.

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Thermal Stability of an Mg–Nd Alloy Processed by High‐Pressure Torsion

et al. 2019

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The evolution of microstructure, texture, and mechanical properties of an Mg–1.43Nd (wt%) alloy is investigated after processing by high‐pressure torsion at room temperature through five turns and isochronal annealing for 1 h at 150, 250, 350, and 450 °C using electron backscatter diffraction and Vickers microhardness. The alloy exhibits a good thermal stability up to annealing at 250 °C, with mean grain size of ≈0.65 μm. The microhardness shows an initial hardening after annealing at 150 °C and then a subsequent softening. The deformation texture, a basal texture shifted 60° away from the shear direction (SD), is retained during annealing up to 250 °C. In contrast, a basal texture with symmetrical splitting toward SD is developed after annealing at 350 °C. The precipitation sequence and their pinning effects are responsible for the age‐hardening, stabilization of grain size, and the texture modification. The kinetics of grain growth in the Mg–1.43Nd alloy follows two stages depending on the temperature annealing range, with an activation energy of ≈26 kJ mol−1 in the low temperature range of 150–250 °C and ≈147 kJ mol−1 in the high temperature range of 250–450 °C.

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Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion

Abstract: Evaluating the textural and mechanical properties of an Mg-Dy alloy processed by high-pressure torsion,

Cited by 39 publications

References 58 publications

An investigation of the thermal stability of an Mg Dy alloy after processing by high-pressure torsion

An investigation of the thermal stability of an Mg Dy alloy after processing by high-pressure torsion

Faceting of Twin Grain Boundaries in High‐Purity Copper Subjected to High Pressure Torsion

Thermal Stability of an Mg–Nd Alloy Processed by High‐Pressure Torsion

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