Improving the ductility of Mg-2.5Nd-0.5Zn-0.5Zr alloy by multi-pass hot rolling

Wang, Songhui; Ma, Junfei; Yang, Jingbin; Zhang, Wencong; Sun, Yi-Fei; Pan, Jinqi; Wang, Haixuan

doi:10.1016/j.jmrt.2021.07.124

Cited by 16 publications

(6 citation statements)

References 29 publications

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“…Interestingly, the hot compression experiment was not a transient process, and new dynamically recrystallized grains were involved in deformation during nucleation and growth. Hence, the degree of DRX could only be explained qualitatively according to the information in the GOS figure, while the actual DRX was different from that described in the GOS figure [ 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ].…”

Section: Resultsmentioning

confidence: 92%

“…As the hot compression continued, varying degrees of softening arose so that the flow stress gradually decreased and finally reached the equilibrium state. Take the deformation condition of 573 K/0.001 s −1 in Figure 2 a as an example: when the compression strain was between 0 and 0.04, the flow stress of the Mg-2.5Nd-0.5Zn-0.5Zr alloy increased rapidly from 0 MPa to ~90 MPa, which was attributed to the work-hardening phenomenon caused by the proliferation of dislocation, delivery entanglement and dislocation movement obstruction [ 32 , 33 , 34 , 35 ]. With the increase in strain, dynamic recovery (DRV) increased and work hardening decreased.…”

Section: Resultsmentioning

confidence: 99%

“…With the increase in deformation temperature, the Z value was larger, which weakened the grain refining effect of DRX and resulted in coarse recrystallized grains [ 15 ]. Meanwhile, the grain boundary migration speed was accelerated, and grains noticeably grew [ 32 ]. The recrystallization proportions of the alloys were 75.5% (573 K), 59.8% (623 K), 67.5% (673 K), 65.5% (723 K) and 84.5% (773 K), respectively.…”

Section: Resultsmentioning

confidence: 99%

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Hot Deformation Behavior, Processing Maps and Microstructural Evolution of the Mg-2.5Nd-0.5Zn-0.5Zr Alloy

Wang

Yang

et al. 2022

Materials

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Isothermal hot compression experiments were conducted on Mg-2.5Nd-0.5Zn-0.5Zr alloy to investigate hot deformation behavior at the temperature range of 573–773K and the strain rate range of 0.001s−1–10s−1 using a Gleeble-3500D thermomechanical simulator. The results showed that the rheological curve showed a typical work hardening stage, and there were three different stages: work hardening, transition and steady state. A strain compensation constitutive model was established to predict the flow stress of the Mg-2.5Nd-0.5Zn-0.5Zr alloy, and the results proved that it had high predictability. The main deformation mechanism of the Mg-2.5Nd-0.5Zn-0.5Zr alloy was dislocation climbing. The processing maps were established to distinguish the unstable region from the working region. The maps showed that the instability generally occurred at high strain rates and low temperatures, and the common forms of instability were cracking and flow localization. The optimum machining range of the alloy was determined to be 592–773K and 0.001–0.217 s−1. With the increase in deformation temperature, the grain size of the alloy grew slowly at the 573–673K temperature range and rapidly at the 673–773K temperature range.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Hot Deformation Behavior, Processing Maps and Microstructural Evolution of the Mg-2.5Nd-0.5Zn-0.5Zr Alloy

Wang

Yang

et al. 2022

Materials

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“…Larger grains provide more room for dislocation storage than finer grains and thus are good for ductility [31,32]. Strong basal texture along the tensile direction is detrimental to ductility [31,[33][34][35][36][37]. Dislocations [32,35] and precipitates [38,39] of high density can inhibit dislocation movements and thus promote stress concentration, deteriorating the ductility of alloys.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Effect of Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of an Mg–5Sn Alloy

Zhuo

Shao

Zhang

et al. 2022

Metals

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An Mg–5Sn alloy was processed by equal channel angular pressing (ECAP) for different passes (4P, 8P, and 12P), and the microstructure evolution and mechanical properties were investigated. The grain size, amount of Mg2Sn precipitates, and texture of ECAP alloys depend on the number of passes. The ECAP 8P alloy has the finest grains and largest area fraction of Mg2Sn particles, followed by the ECAP 12P alloy. The ECAP 4P and 8P alloys exhibit basal textures tilted towards transverse direction (TD), whereas the ECAP 12P alloy shows basal texture with the c-axis of the grains parallel to the extrusion direction (ED). ECAP alloys show superior strengths compared to the as-cast alloy, mainly attributed to fine grain strengthening, precipitation strengthening, texture strengthening, and dislocation strengthening. The ultimate tensile strength (UTS) increases while the elongation (EL) decreases with increasing ECAP pass.

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“…not only breaks up the coarse internal eutectic compounds within the as-cast Mg-Nd-Zn-Zr alloy but also leads to grain refinement, which further improves the alloy strength and toughness. For example, Wang et al [ 12 ] found that the grain size of Mg-2.5Nd-0.5Zn-0.5Zr can be refined to 4.25 mm after multi-pass hot rolling. The subsequent heat treatment is very important to improve the properties of deformed materials.…”

Section: Introductionmentioning

confidence: 99%

The Microstructural Evolution and Grain Growth Kinetics of Fine-Grained Extruded Mg-Nd-Zn-Zr Alloy

Jiao

Zhan³

et al. 2022

Materials

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The microstructure evolution and grain growth kinetics of the fine-grained extruded Mg-Nd-Zn-Zr alloy were investigated by holding the extruded plate for a wide range of time in the temperature range of 470 °C to 530 °C. By observing the optical micrographs, it was found that the material showed abnormal grain growth at the experimental condition of 470 °C × 24 h, and the time point of abnormal grain growth appeared significantly earlier with the increase in the experimental temperature. The evaluation of the second phase content within the alloy indicates that the presence of the second phase contributes to the microstructural stability of the Mg-Nd-Zn-Zr alloy. However, the slow coarsening/dissolution of the second phase is an important cause of abnormal grain growth. Based on the experimental data, the isothermal grain growth kinetic models of the fine-grained extruded Mg-Nd-Zn-Zr alloy were developed based on the Sellars model. The grain growth exponent was in the range of 5.5–8 and decreased gradually with the increase in the experimental temperature. The grain growth activation energy is approximately 150.00 kJ/mol, which is close to the bulk diffusion activation energy of magnesium, indicating that the grain growth is controlled by lattice diffusion. By energy spectrometry (EDS), the compositional changes of the second phase within this alloy at 500 °C were investigated.

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Improving the ductility of Mg-2.5Nd-0.5Zn-0.5Zr alloy by multi-pass hot rolling

Cited by 16 publications

References 29 publications

Hot Deformation Behavior, Processing Maps and Microstructural Evolution of the Mg-2.5Nd-0.5Zn-0.5Zr Alloy

Hot Deformation Behavior, Processing Maps and Microstructural Evolution of the Mg-2.5Nd-0.5Zn-0.5Zr Alloy

Effect of Equal Channel Angular Pressing on the Microstructure and Mechanical Properties of an Mg–5Sn Alloy

The Microstructural Evolution and Grain Growth Kinetics of Fine-Grained Extruded Mg-Nd-Zn-Zr Alloy

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