Defect in Ultra-Fine Grained Mg-Based Alloys Deformed by High-Pressure Torsion

Čı́žek, Jakub; Procházka, I.; Smola, Bohumil; Stulı́ková, Ivana; Kužel, R.; Matěj, Zdeněk; Cherkaska, V.; Исламгалиев, Р. К.; Kulyasova, Olya B.

doi:10.1007/1-4020-4972-2_429

Cited by 7 publications

(12 citation statements)

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“…Many authors have reported similar significant grain refinement within one HPT turn [34,35,60]. In addition, the very slight change between 1 and 10 HPT turns is due in part to a concomitant saturation of grain subdivision and the dislocation density and in part to a recovery of dislocations which begins even at room temperature in HPT-deformed Mg [61].…”

Section: Hardness Evolutionmentioning

confidence: 86%

Texture and microhardness of Mg-Rare Earth (Nd and Ce) alloys processed by high-pressure torsion

Bourezg

Azzeddine

Baudin

et al. 2018

Materials Science and Engineering: A

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The influence of high-pressure torsion (HPT) processing on the texture and microhardness of two binary Mg-RE (RE=Nd and Ce) alloys was investigated using X-ray diffraction and Vickers microhardness measurements. Disks cut from the alloys were processed by HPT at room temperature for up to 10 turns. The precipitation products of both alloys were identified using synchrotron radiation. The results show that both alloys exhibit a weak basal texture where the c-axis of most grains is shifted 15° from the shear direction. An Mg-1.44Ce (wt. %) alloy showed a continuous decrease in the texture strength which may be due to the effect of second precipitation phases (Mg 17 Ce 2 and MgCe 2). The microhardness of both alloys increased significantly with increasing HPT turns but levelled-off beyond about one HPT turn. Maximum values of ~65 and ~96 Hv were achieved which are significantly higher than the hardness of the undeformed Mg-Ce and Mg-Nd alloys.

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Section: Hardness Evolutionmentioning

confidence: 86%

Texture and microhardness of Mg-Rare Earth (Nd and Ce) alloys processed by high-pressure torsion

Bourezg

Azzeddine

Baudin

et al. 2018

Materials Science and Engineering: A

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“…Improving the thermal stability of UFG materials may be achieved by reducing the grain boundary mobility and the driving force for grain growth, and this may be realized through the addition of different alloying elements or by the precipitation of second phase particles [25,26]. 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.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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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“…Moreover, Mg–RE alloys have proven their efficiency in producing very significant grain refinement compared with conventional Mg‐based alloy after SPD processing . For example, the Mg–10Gd (wt%) alloy exhibits an average grain size of ≈100 nm against ≈1 μm in the AZ31 alloy after similar HPT processing …”

Section: Introductionmentioning

confidence: 99%

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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Defect in Ultra-Fine Grained Mg-Based Alloys Deformed by High-Pressure Torsion

Cited by 7 publications

References 0 publications

Texture and microhardness of Mg-Rare Earth (Nd and Ce) alloys processed by high-pressure torsion

Texture and microhardness of Mg-Rare Earth (Nd and Ce) alloys processed by high-pressure torsion

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

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

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