A simultaneous enhancement of both strength and ductility by a novel differential-thermal ECAP process in Mg-Sn-Zn-Zr alloy

Zhou, Tianshui; Zhang, Quanfa; Li, Qianqian; Wang, Lidong; Li, Qinglin; Liu, Dexue

doi:10.1016/j.jallcom.2021.161653

Cited by 30 publications

(6 citation statements)

References 53 publications

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“…The σ RSS and Schmid factor (SF) were positively correlated, thus the values of SF could be used to determine whether the corresponding slip system could be activated. 69 The SF values of the {0001}<11-20 > basal slips, {1-100}<11-20 > prismatic slips and {−1-122}<11−23 > pyramidal slips for TZK alloys with different deformation conditions were listed as Figure 13, and the results showed the basal and pyramidal slips of DT-1 alloy had higher SF values. It 1,10,[50][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66] was important that the higher the SF value of slips was prone to activate.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

The microstructure and mechanical properties of Mg-Sn-based alloy processed by differential-thermal equal channel angular pressing

Guo,

Li,

Zhou

et al. 2024

Materials Science and Technology

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Numerous studies of equal channel angular pressing (ECAP) considered the sample and mould temperatures as a whole, ignoring their different control effects during ECAP deformation. In this paper, the microstructure and mechanical properties of Mg-Sn-Zn-Zr (TZK) alloys were investigated after ECAP deformation at different mould and sample temperatures. The results revealed that higher mould temperatures controlled the actual deformation temperatures and lower sample temperatures prevented grain growth during preheating. After ECAP deformation at mould temperature of 300 °C and sample temperature of room temperature, the alloy consisted of abundant dynamical recrystallisation grains, with an elongation of 30% and a strength of 251.49 MPa. This study would provide a novel idea for the optimisation of the ECAP process.

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Section: Mechanical Propertiesmentioning

confidence: 99%

The microstructure and mechanical properties of Mg-Sn-based alloy processed by differential-thermal equal channel angular pressing

Guo,

Li,

Zhou

et al. 2024

Materials Science and Technology

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“…In metallic materials, dislocations and twinning are the main deformation mechanisms [137]. At different temperatures, the deformation mechanism remains the same, which is dominated by slip [50].…”

Section: Deformation Mechanismmentioning

confidence: 99%

Recent Advances in the Equal Channel Angular Pressing of Metallic Materials

et al. 2022

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Applications of a metallic material highly depend on its mechanical properties, which greatly depend on the material’s grain sizes. Reducing grain sizes by severe plastic deformation is one of the efficient approaches to enhance the mechanical properties of a metallic material. In this paper, severe plastic deformation of equal channel angular pressing (ECAP) will be reviewed to illustrate its effects on the grain refinement of some common metallic materials such as titanium alloys, aluminum alloys, and magnesium alloys. In the ECAP process, the materials can be processed severely and repeatedly in a designed ECAP mold to accumulate a large amount of plastic strain. Ultrafine grains with diameters of submicron meters or even nanometers can be achieved through severe plastic deformation of the ECAP. In detail, this paper will give state-of-the-art details about the influences of ECAP processing parameters such as passes, temperature, and routes on the evolution of the microstructure of metallic materials. The evolution of grain sizes, grain boundaries, and phases of different metallic materials during the ECAP process are also analyzed. Besides, the plastic deformation mechanism during the ECAP process is discussed from the perspectives of dislocation slipping and twinning.

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“…However, few reports have evaluated the deformation behavior of grains with different orientations in the same sample. Although Zhou et al [27] and Woo et al [28] discussed the deformation mechanisms of grains with different orientations in deformed samples, the contribution of these grains with different orientations to the overall deformation behavior remains unclear.…”

Section: Introductionmentioning

confidence: 99%

In-situ SEM and EBSD investigation of the deformation behavior of extruded Mg-6Al-1Zn-1.1Sc alloy

Zhang,

Wang

et al. 2023

Mater. Res. Express

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The present study subjects the extruded Mg-6Al-1Zn-1.1Sc (wt. %) alloy to reveal the deformation during in-situ tensile at room temperature by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The results demonstrate that the parallel slip traces are increasingly observed on the surfaces of grains with increasing strains owing to the movement of dislocations inside the grains toward the sample surface, while microcracks are frequently observed at grain boundaries. The slip trace analysis indicate that many basal slips are activated during the deformation. The twinning behaviors of the extruded alloy during tensile are dominated by extension twinning. The orientation of grains is demonstrated to have a profound effect on their deformation, where grains with orientations deviating greatest from <0001>//TD exhibit the highest dislocation density after deformation. This can be attributed to the fact that these oriented grains are prone to activate basal slip due to the large Schmid factor (SF). Similarly, the deformation of grains is also found to be highly dependent on their size, where the dislocation density of coarser grains increases more significantly than that of finer grains during deformation because coarser grains have greater space available for accommodating dislocations than finer grains.

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A simultaneous enhancement of both strength and ductility by a novel differential-thermal ECAP process in Mg-Sn-Zn-Zr alloy

Cited by 30 publications

References 53 publications

The microstructure and mechanical properties of Mg-Sn-based alloy processed by differential-thermal equal channel angular pressing

The microstructure and mechanical properties of Mg-Sn-based alloy processed by differential-thermal equal channel angular pressing

Recent Advances in the Equal Channel Angular Pressing of Metallic Materials

In-situ SEM and EBSD investigation of the deformation behavior of extruded Mg-6Al-1Zn-1.1Sc alloy

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