Influence of equal channel angular pressing routes on texture, microstructure and mechanical properties of extruded AX41 magnesium alloy

Krajňák, Tomáš; Minárik, Peter; Gubicza, Jenő; Máthis, Kristián; Kužel, R.; Janeček, Miloš

doi:10.1016/j.matchar.2016.11.044

Cited by 72 publications

(32 citation statements)

References 42 publications

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“…Processing by ECAP resulted in additional grain refinement. Homogeneous microstructures with an average grain size of 1.5 µm were achieved after eight passes of the ECAP, which is common for similarly processed magnesium alloys [27,28,[32][33][34][35]. However, the studied ZN11 alloy showed enhanced strength despite the comparable grain refinement.…”

Section: Discussionmentioning

confidence: 90%

“…As mentioned above, the measured increase in microhardness was by a factor of 1.5, while YCS increased by a factor of 2.5. A larger relative effect on yield stress than on microhardness is rather common; however, note that the initial material has a different grain structure in different studies [27,28,32,36]. Therefore, the effect of the processing on the enhanced microhardness can be analyzed with the use of the Hall-Petch (HP) plot shown in Figure 10.…”

Section: Discussionmentioning

confidence: 99%

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Texture Hardening Observed in Mg–Zn–Nd Alloy Processed by Equal-Channel Angular Pressing (ECAP)

Stráská

Minárik

Šašek

et al. 2019

Metals

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The addition of Nd significantly improves the mechanical properties of magnesium alloys. However, only limited amounts of Nd or other rare earth (RE) elements should be used due to their high price. In this study, a low-alloyed Mg–1% Zn–1% Nd (ZN11) alloy was designed and processed by hot extrusion and subsequent equal-channel angular pressing (ECAP) in order to achieve a very fine-grained condition with enhanced strength. The microstructure, texture, and mechanical properties were thoroughly studied. The microstructure after 8 passes through ECAP was homogeneous and characterized by an average grain size of 1.5 µm. A large number of tiny secondary phase precipitates were identified as ordered Guinier–Preston (GP) zones. Detailed analysis of the Schmid factors revealed the effect of the texture on deformation mechanisms. ECAP processing more than doubled the achieved yield compression strength (YCS) of the ZN11 alloy. Significant strengthening by ECAP is caused by grain refinement and the formation of ordered Guinier–Preston zones and particles of a secondary γ-phase.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Texture Hardening Observed in Mg–Zn–Nd Alloy Processed by Equal-Channel Angular Pressing (ECAP)

Stráská

Minárik

Šašek

et al. 2019

Metals

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“…The observed texture of samples having basal planes parallel to the tensile axis indicates very low Schmid factor for deformation in the basal plane and therefore a difficult activation of basal slip. Krajňák et al performed analysis of distribution dislocations in the particular slip systems in an AX41 alloy subjected to ECAP procedure [16]. They estimated that most dislocations (80 -95 %) in all ECAP samples have <a>-type Burgers vector.…”

Section: Discussionmentioning

confidence: 99%

“…Material was underwent to 1, 2, 4 and 8 passes through the ECAP tool. According to literature data, the A route was chosen [16]. ECAPed samples will be hereafter depicted as 1P, 2P, 4P and 8P (after 1, 2, 4, and 8 passes in the ECAP tool).…”

Section: Methodsmentioning

confidence: 99%

Influence of strain rate on deformation behaviour of an AX52 alloy processed by equal channel angular pressing (ECAP)

Trojanová¹,

Halmešová²,

Džugan³

et al. 2018

LoM

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Cast AX52 magnesium alloy with Al and Ca was processed by equal channel angular pressing (ECAP) using A route and 1 -8 passes. The light and electron microscopy revealed a substantial microstructure refinement in the alloy. Al 2 Ca eutectics were found to be typical features of the microstructure. The ECAP procedure disintegrated eutectic particles. Miniaturized samples were cut from the ECAP-processed bulks. The samples with the tensile axis parallel to the extrusion direction were tested in tension at room temperature with initial strain rates of 0.001, 1, 10 and 50 s −1 . The offset yield stress increased with increasing number of passes. A rapid increase of deformation stresses was observed for the highest strain rate of 50 s −1 . The activation volumes were estimated from the strain rate dependence of the offset yield stress. The strain rate sensitivity is influenced by the number of passes. A rapid increase of the activation volume at the highest strain rate indicates the change of the deformation mechanism. Limiting small values of the activation volume were found for the highest strain rates. Tensile tests at higher strain rates revealed unstable deformation behavior. This unstable deformation depends on the number of passes. Mechanisms operating at various strain rates are discussed in relation to the microstructure and number of ECAP passes.

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“…Recently, Krajňák et al studied mechanical properties and strengthening mechanical of as‐ECAP‐processed magnesium alloy. Their experimental results and data analysis suggested that amounts of the dislocation‐related strengthening and the grain size‐related strengthening were comparable after 8 ECAP passes …”

Section: Introductionmentioning

confidence: 99%

Synergic Improvement of Plasticity and Strength of Al–Zn–Mg–Cu Alloy by Grain Refinement and Precipitates Redistribution using Cyclic Extrusion Compression

et al. 2018

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To explore the method to further improve the comprehensive performance of a high-strength Al-Zn-Mg-Cu alloy, 1-8 passes cyclic extrusion compression (CEC) experiments are carried out. By thermal-mechanical coupled numerical simulation and experiment investigation, the variation of macro field variables, size distribution, and morphological characteristics of grain structures, and precipitates are quantitatively investigated. The results show that the dynamic recrystallization occurs during CEC processing. As the number of CEC processing increases, the grain size and aspect ratio decreases monotonically, while the volume fraction of secondary phases first decreases, reaches its minimum (0.26%) at 6 passes and then increases, indicating their re-dissolution and further precipitation under severe stress field. In addition, the greatest comprehensive mechanical properties of Al-Zn-Mg-Cu alloy are achieved by 2 passes CEC with the hardness, tensile strength, yield strength, and elongation improved by 89.29%, 63.77%, 110%, 134.93%, respectively. By theoretical calculation and fractograph observations, it is found that dislocation strengthening and Hall-Petch strengthening both plays a key role in the overall strengthen, and the enhanced plasticity can be attributed to the variation of the fracture mode and the propagation path of the cracks.

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Influence of equal channel angular pressing routes on texture, microstructure and mechanical properties of extruded AX41 magnesium alloy

Cited by 72 publications

References 42 publications

Texture Hardening Observed in Mg–Zn–Nd Alloy Processed by Equal-Channel Angular Pressing (ECAP)

Texture Hardening Observed in Mg–Zn–Nd Alloy Processed by Equal-Channel Angular Pressing (ECAP)

Influence of strain rate on deformation behaviour of an AX52 alloy processed by equal channel angular pressing (ECAP)

Synergic Improvement of Plasticity and Strength of Al–Zn–Mg–Cu Alloy by Grain Refinement and Precipitates Redistribution using Cyclic Extrusion Compression

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