Effects of cyclic extrusion and compression parameters on microstructure and mechanical properties of Mg–1.50Zn–0.25Gd alloy

Huang, Hua; Tang, Zibo; Tian, Yuan; Jia, Gaozhi; Niu, Jialin; Zhang, Hua; Jia, Pei; Ding, Wei

doi:10.1016/j.matdes.2015.07.155

Cited by 33 publications

(4 citation statements)

References 53 publications

(65 reference statements)

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“…Binesh and Aghaie-Khafri [42] indicated that these precipitate usually act as the preferential sites for dislocation and recrystallization in the ensuing ECAP deformation process, which is known as the particle-stimulated nucleation (PSN) mechanism. Huang et al [43] reported that the microstructure with a larger size and higher volume fraction of precipitates showed stronger PSN effect. In the homogenization process, not only the coarse precipitates like Al 6 (Cu, Fe), Al 2 MgCu and Al 7 Cu 2 Fe coarsen, but also the MgZn 2 phase, are formed and the volume fraction is increased significantly.…”

Section: Effects Of Homogenization On the Microstructural Evolutionmentioning

confidence: 99%

Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA Process

Jiang

Wang

2017

Acta Metall. Sin. (Engl. Lett.)

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A modified strain-induced melt activation (SIMA) process consisting of homogenization, equal-channel angular pressing (ECAP) and subsequent heating to the semisolid temperatures was introduced to prepare the 7075 aluminum alloy with superior thixotropic behaviors. The effects of both the homogenization and the number of ECAP passes, as well as the isothermal temperatures on the microstructural evolution, were investigated. The results indicate that ideal microstructure wherein fine and globular solid grains surrounded by uniform liquid films can be achieved through ECAP deformationrecrystallization mechanism. Increasing the number of ECAP passes accelerates the recrystallization of strained grains, thus reducing the average grain size and improving the grain sphericity. Moreover, higher holding temperatures and prolonged soaking time can improve the growth of the solid grains. Two main coarsening mechanisms, viz. coalescence and Ostwald ripening, contribute to the growth of the solid grains simultaneously and independently. The tensile strength of the 7075 alloys after four-pass ECAP-based SIMA and T6 heat treatment is relatively lower than the as-received billet, while the elongation of SIMA processed samples is much higher than that of as-received ones. Increasing the number of ECAP passes improves the tensile strength for alloys with and without T6 treatment due to the fine grain strengthening mechanism.

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Section: Effects Of Homogenization On the Microstructural Evolutionmentioning

confidence: 99%

Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA Process

Jiang

Wang

2017

Acta Metall. Sin. (Engl. Lett.)

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“…One avenue for improvement involves grain refinement, a process known to effectively enhance the strength and ductility of magnesium alloys. This is achieved through severe plastic deformation (SPD) methods such as equal channel angular pressing (ECAP) and differential speed rolling (DSR) [16][17][18]. However, in many industrial settings, the implementation of ECAP and DSR processes can be prohibitively expensive and challenging to scale up for large-scale production [19,20].…”

Section: Introductionmentioning

confidence: 99%

Influence of Processing Temperature and Strain Rate on the Microstructure and Mechanical Properties of Magnesium Alloys Processed by Single-Pass Differential Speed Rolling

Hale,

Xu,

Fialkova

et al. 2024

Crystals

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Magnesium-based alloys show significant promise for widespread applications owing to their lightweight nature and improved mechanical properties achieved through grain refinement via hot rolling. This investigation focuses on Mg-xAl-yCa-zMn (AXM alloys), pre-heated to temperatures of 350, 400, and 450 °C and processed via both single-pass differential speed rolling (DSR) and conventional rolling (CR). The key findings reveal the interplay between processing temperature, strain rate during single-pass rolling, and an innovative approach for incorporating varying amounts of Ca, influencing grain size, quantity of dynamic recrystallization (DRX) grains, and overall mechanical properties, including strength and ductility. A noteworthy observation is the positive correlation between an increase in the total reduction during hot rolling and a higher fraction of DRXed grains. This leads to a significant reduction in average grain size, diminishing from 60.3 ± 54.3 μm to 19.5 ± 14.2 μm at 40%, nearly a third the size of T4 grains (the initial homogenized microstructure of the AXM alloys). The resultant material strength experiences a doubling from an average of 125 ± 10.2 MPa (T4) to 260 ± 25.8 MPa (DSR rolled at 40%) for the AXM alloys with potential improvement in the ductility depending on rolling speed conditions. This study also aims to analyze the combination of rolling temperature, rolling speed, thickness reduction, speed difference and Ca content implemented across a wide range of temperatures and strain rates to provide a holistic approach to the processing parameters affecting the microstructure and mechanical properties of AXM alloys. Furthermore, this study provides a deeper understanding of DRX mechanisms, including continuous DRX (CDRX), discontinuous DRX (DDRX), and twinning induced DRX (TDRX), while each of these mechanisms plays a distinct role in the overall enhancement of formability and performance of magnesium alloys.

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“…However, the tension strength of these CECed alloys shows an unexpected decrease even though grain size was reduced effectively, which is not consistent with the Hall-Petch relationship. Although the previous studies have shown that this inverse Hall-Petch relationship is caused by texture changes in these CECed alloys [ 15 , 16 , 17 , 18 ], there is no way to distinguish the strengthening mechanism of individual texture and grain size on the yield strength until now. Therefore, we fabricated the ZK61 alloy rods with different grain sizes and crystallographic texture by CEC and constructed the room-temperature yield strength contours for the tension and compression as a function of grain size and the texture, which made it possible to distinguish the strengthening mechanism of individual texture and grain size on the yield strength.…”

Section: Introductionmentioning

confidence: 99%

Effects of Texture and Grain Size on the Yield Strength of ZK61 Alloy Rods Processed by Cyclic Extrusion and Compression

Zhang

Biao

et al. 2017

Materials

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The ZK61 alloy rods with different grain sizes and crystallographic texture were successfully fabricated by cyclic extrusion and compression (CEC). Their room-temperature tension & compression yield strength displayed a significant dependence on grain size and texture, essentially attributed to {10-12} twinning. The texture variations were characterized by the angle θ between the c-axis of the grain and the extrusion direction (ED) during the process. The contour map of room-temperature yield strength as a function of grain size and the angle θ was obtained. It showed that both the tension yield strength and the compression yield strength of ZK61 alloy were fully consistent with the Hall-Patch relationship at a certain texture, but the change trends of the tension yield strength and the compression yield strength were completely opposite at the same grain size while texture altered. The friction stresses of different deformation modes calculated based on the texture confirmed the tension yield strength of the CECed ZK61 alloy rods, which was determined by both the basal slip and the tension twinning slip during the tension deformation at room temperature, while the compression yield strength was mainly determined by the basal slip during the compression deformation.

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Effects of cyclic extrusion and compression parameters on microstructure and mechanical properties of Mg–1.50Zn–0.25Gd alloy

Cited by 33 publications

References 53 publications

Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA Process

Influence of Processing Parameters on Microstructural Evolution and Tensile Properties for 7075 Al Alloy Prepared by an ECAP-Based SIMA Process

Influence of Processing Temperature and Strain Rate on the Microstructure and Mechanical Properties of Magnesium Alloys Processed by Single-Pass Differential Speed Rolling

Effects of Texture and Grain Size on the Yield Strength of ZK61 Alloy Rods Processed by Cyclic Extrusion and Compression

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