Microstructures evolution, texture characteristics and mechanical properties of Mg-2.5Nd-0.5Zn-0.5Zr alloy during the high strain rate hot-rolling

Wang, Songhui; Zhang, Wencong; Wang, Haixuan; Yang, Jingbin; Cui, Guorong; Wang, Guofeng

doi:10.1016/j.msea.2020.140488

Cited by 33 publications

(14 citation statements)

References 43 publications

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“…The Zener–Hollomon (

) parameters determine whether dynamic recrystallized grains were refined during plastic deformation [ 22 ]. 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 ].…”

Section: Resultsmentioning

confidence: 99%

“…The geometry dislocation calculation method was that described in Refs. [ 6 , 15 ]. The gradual change from blue to red in the KAM maps shows that the local directional deviation was gradually increasing.…”

Section: Resultsmentioning

confidence: 99%

“…Mg-Nd-Zn-Zr alloys are favored by many researchers for their excellent mechanical properties and low RE content [ 15 , 16 , 17 , 18 ]. However, the limited thermoplastic processing conditions of Mg-RE alloys restrict their further application [ 19 ].…”

Section: Introductionmentioning

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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“…The Zener–Hollomon (

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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“…These eutectic compounds are easy to form cracks, resulting in poor plasticity of as-cast alloy [ 9 ]. However, thermo-plastic processing (for example hot extrusion [ 10 ], hot rolling [ 11 ], etc.) 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.…”

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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“…Magnesium (Mg) alloys, the lightest metal structural material in the industry, have been widely used in transportation, electronics, military, and other industries. [1][2][3][4] Among them, the development of magnesium alloys is closely tied to the solution of emission problems in the transportation field. [5][6][7] Improving the mechanical properties of magnesium alloys through plastic deformation technology has become an important approach for engineering application of magnesium alloys.…”

Section: Introductionmentioning

confidence: 99%

Improving Tension/Compression Asymmetry of a Hot‐Extruded Mg–Zn–Y–Zr Alloy via Yttrium Addition

et al. 2021

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In this study, effects of different yttrium (Y) contents ranging from 0 to 2.5 wt% on the microstructure and tension/compression asymmetry of as‐extruded Mg–5.5Zn–0.6Zr alloys are investigated. The influence of Y on improving the tension/compression yield strength is been studied. The results show that the volume fractions of the microscale I (Mg3YZn6) and W (Mg3Zn3Y2) phases remarkably increase with Y addition. Simultaneously, the nanoscale MgZn and Mg–Zn–Y phases uniformly precipitate during extrusion. Benefiting from the pinning of second phases, the microstructure is strikingly refined from 16.3 to 5.5 μm. Among them, the Y element promotes grain refinement most effectively when the Y content is 2.0 wt%. Second phase strengthening and fine‐grain strengthening enhance the hardening rate and suppress twinning, which leads to the improvement of the tension/compression asymmetry. Specifically, yield strength of 231 MPa and ultimate tensile strength of 312 MPa are achieved with 2.5 wt% Y addition. The relative increment is about 33.0% and 65.3% compared to the unmodified alloy, respectively. In addition, the tensile yield strength to compressive yield strength ratio (TYS/CYS) is reduced from 1.30 to 1.09.

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Microstructures evolution, texture characteristics and mechanical properties of Mg-2.5Nd-0.5Zn-0.5Zr alloy during the high strain rate hot-rolling

Cited by 33 publications

References 43 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

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

Improving Tension/Compression Asymmetry of a Hot‐Extruded Mg–Zn–Y–Zr Alloy via Yttrium Addition

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