Microstructure and Low-Temperature Superplasticity of Fine-Grain ZK60 Magnesium Alloy Produced by Equal-Channel Angular Pressing

Yu, Yandong; Shuzhen, Kuang; Chu, Desheng; Zhou, Hao; Li, Jie; Li, Caixia

doi:10.1007/s13632-015-0238-9

Cited by 8 publications

(8 citation statements)

References 19 publications

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“…It was reported that 4 passes ECAP at 473 K resulted in a smaller grain size (1.2 µm) than that of performed at the lower temperature of 453 K (1.6 µm). 50) Even though this result is not consistent with well-known relationship between final achieved grain size and process temperature of ECAP, detailed analysis was not provided in that study to explain that paradox. In an another study, as-extruded ZK60 alloy was subjected to 8 passes ECAP at 433 K followed by a post-ECAP annealing at 473 K for 30 min.…”

Section: Mg-based Alloys 221 Ufg Formation In Mg-based Alloys For Ltsmentioning

confidence: 64%

“…ECAP was used successfully to attain UFG microstructure and LTS in ZK60 and ZK40 alloys. Yu et al 50) applied ECAP processes to an as-extruded ZK60 alloy at three different temperatures of 453 K, 473 K and 493 K using an ECAP die that was capable of applying a back pressure of 40 MPa during the ECAP process. It was reported that 4 passes ECAP at 473 K resulted in a smaller grain size (1.2 µm) than that of performed at the lower temperature of 453 K (1.6 µm).…”

Section: Mg-based Alloys 221 Ufg Formation In Mg-based Alloys For Ltsmentioning

confidence: 99%

“…Mostly extrusion was considered to eliminate the as-cast microstructure and enhance the ductility prior to ECAP process. 44,45,50,51) Second, an ECAP facility that is capable of applying back pressure was also used to prevent the samples from crack formation. 50) It has been well-established that back-pressure has an important role on the workability of metals during ECAP.…”

Section: Mg-based Alloys 221 Ufg Formation In Mg-based Alloys For Ltsmentioning

confidence: 99%

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An Overview of the Principles of Low-Temperature Superplasticity in Metallic Materials Processed by Severe Plastic Deformation

Demirtas

Pürçek

2023

Mater. Trans.

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Low-temperature superplasticity (LTS) is crucial to reduce manufacturing cost and to enhance the applications of superplastic forming. It is well known that grain refinement is the key point to decrease the temperature at which superplasticity is attained. Therefore, ultrafine-grained (UFG) materials have become attractive for achieving LTS. Severe plastic deformation (SPD) techniques provide abnormal grain refinement, and thus they have been used to achieve LTS in metallic materials. This paper overviews and examines the reports of LTS in the severely-deformed metallic materials. It provides fundamentals of grain refinement via different SPD techniques in various classes of metallic materials including Al-, Mg-, and Ti-based alloys. It also gives a brief summary about the effect of microstructural requirements on LTS with an emphasis on grain size, type and chemical composition of grain boundaries and microstructural alteration during the superplastic deformation. In the last section of the manuscript, the main deformation mechanism of LTS were also explained.

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Section: Mg-based Alloys 221 Ufg Formation In Mg-based Alloys For Ltsmentioning

confidence: 64%

Section: Mg-based Alloys 221 Ufg Formation In Mg-based Alloys For Ltsmentioning

confidence: 99%

Section: Mg-based Alloys 221 Ufg Formation In Mg-based Alloys For Ltsmentioning

confidence: 99%

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An Overview of the Principles of Low-Temperature Superplasticity in Metallic Materials Processed by Severe Plastic Deformation

Demirtas

Pürçek

2023

Mater. Trans.

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“…The aim of the present study was thus to modify the unified approach already developed and to take into account the potential effect of grain size. Furthermore, in combination with a severe plastic deformation process, such as rolling, extrusion, drawing, equal channel angular pressing (ECAP), and friction stir processing (FSW), it can lead to stable fine grain structures in wrought alloys [26][27][28][29][30]. The large stress and huge deformation values imposed during those technologies generate high dislocation densities in the materials, which evolve into ultrafine grain structures through recovery and recrystallization processes.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Deformation Behavior of the AZ31 Alloy Processed by Double-Sided FSW Technology

Cha

Hou

Zhang

2022

Metals

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Generally, AZ31 magnesium alloys have poor formation ability near room temperature. This material, with ultrafine grains, usually exhibits excellent superplasticity at high temperature. Therefore, the preparation of materials with suitable microstructures to obtain the superplasticity is an important goal. In this study, the double-side FSW (Friction Stir Processing) process was applied on the AZ31Mg alloy to obtain the microstructure with ultra-fine grains. The effect of the FSW on the microstructure and the mechanism of microstructure evolution was elaborated. Meanwhile, the effects of deformation parameters, temperature, and strain rate on flow behavior and superplasticity of the joint were systematically and comparatively studied. It was found that the microstructure at the joint center with double-side FSW could obtain much finer grains with an average grain size of 9.6 μm compared with the rolled materials (25.9 μm). The high temperature deformation results showed that the optimum elongation (446%) was achieved with the deformation temperature of 450 °C and strain rate of 0.0003 s−1, which was far greater than the elongation of the room temperature (20.8%). The mechanism of parameters on deformation behavior of the joint samples was elaborated.

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“…22) The superplasticity of magnesium alloys can be achieved after grain refinement. The ZK60 showed excellent superplastic elongation of 628% at 523 K under strain rate of 1.67 © 10 ¹3 s ¹1 after four passes of ECAP at 473 K. 23) The Mg-5 mass% Sn alloy displayed very fine grain size of 10 µm after equal channel angular extrusion (ECAE). The maximum elongation was 550% at high temperature 623 K with strain rate of 1 © 10 ¹3 s ¹1 .…”

Section: Introductionmentioning

confidence: 99%

Pseudo-Superplastic Characteristics of ZK60 Alloy with Fibrous Microstructure

Wang

Saufan

et al. 2018

Mater. Trans.

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The superplasticity of ZK60 alloy was investigated after thermomechanical treatments (combination of rolling at 473 K and 673 K). ZK60 alloy, with an equiaxial grains microstructure (average grain size 2.6 µm), showed a maximum elongation of 865.2% with the strain rate 1 © 10 ¹4 s ¹1 under high temperature tensile test at 573 K. Surprisingly, hot-rolled ZK60 samples with fibrous microstructure also displayed pseudo-superplastic behavior with an elongation of 535.2% at the same temperature. Microstructures indicated that the hot-rolled samples with elongated grains exhibited dynamic recovery and recrystallization during high temperature deformation, transforming the fibrous to fine-grained crystals, and thus retaining pseudo-superplastic behavior.

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Microstructure and Low-Temperature Superplasticity of Fine-Grain ZK60 Magnesium Alloy Produced by Equal-Channel Angular Pressing

Cited by 8 publications

References 19 publications

An Overview of the Principles of Low-Temperature Superplasticity in Metallic Materials Processed by Severe Plastic Deformation

An Overview of the Principles of Low-Temperature Superplasticity in Metallic Materials Processed by Severe Plastic Deformation

High-Temperature Deformation Behavior of the AZ31 Alloy Processed by Double-Sided FSW Technology

Pseudo-Superplastic Characteristics of ZK60 Alloy with Fibrous Microstructure

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