Preparation of an Mg–Gd–Zn alloy semisolid slurry by low frequency electro-magnetic stirring

Wang, Cunlong; Chen, Antao; Liang, Zhang; Liu, Wencaı; Wu, Guohua; Ding, Wenjiang

doi:10.1016/j.matdes.2015.06.126

Cited by 41 publications

(8 citation statements)

References 31 publications

(54 reference statements)

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“…Some tensile specimens were directly tested at room temperature. The other specimens were first heat treated in solution for 6 Figure 3 shows the macrograph of the thixoformed part of the nano-sized SiCp/7075 composite. As indicated in Figure 3, a cylinder part was thixoformed successfully due to good filling ability of the semisolid billet.…”

Section: Methodsmentioning

confidence: 99%

“…In the thixoforming, fabricated semisolid billet with spheroidal grains surrounded by liquid phase undergoes a remelting process and forming process. The fabricated methods of semisolid billet include mechanical stirring [4,5], electromagnetic stirring [6,7], strain induced melt activated (SIMA) [8][9][10], as well as recrystallization and partial remelting (RAP) [11,12]. Thixoforming exhibits low resistance to deformation and a good ability to fill die cavity because of the spheroidal grains surrounded by liquid phase.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Remelting Temperature and Soaking Time on Microstructure and Mechanical Properties of the Thixoformed Part of Nano-Sized SiCp/7075 Composite

Jiang

Xiao

Liu

et al. 2018

Metals

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Semisolid billet of the 7075 aluminum matrix composite reinforced with nano-sized SiC particles was first fabricated by an ultrasonic-assisted semisolid stirring method and rheoforming technology. Then it was thixoformed into a cylinder part under different remelting temperatures and soak times. The effects of the remelting temperature and soaking time on the mechanical properties and microstructure of the thixoformed composite part were investigated. The results show that parts of good quality were thixoformed successfully. The microstructure of the top side wall of the thixoformed part consisted of near spheroidal grains. A large quantity of elongated grains occurred in the medium and bottom side walls and the bottom itself. With increasing remelting temperatures, the size of the solid grains of the thixoformed parts showed a trend of first to increase and afterwards to decrease. High density dislocations were found in the microstructure when the remelting temperatures were 590 °C and 600 °C. When the soaking time was 15 min, the severest deformation occurred in the thixoformed part. High mechanical properties of the thixoformed parts were achieved under conditions such as a remelting temperature between 590 °C and 600 °C and a soaking time between 10 min and 15 min. The fracture mode of the thixoformed part changed from transgranular fracture to intergranular fracture when the remelting temperature was elevated from 580 °C to 610 °C. After the thixoformed parts were treated by T6, the ultimate tensile strength (UTS) and elongation of the side wall were improved to 552 MPa and 7.9%, respectively. Dispersed MgZn2 precipitates created by T6 heat treatment led to an improvement of the mechanical properties.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Remelting Temperature and Soaking Time on Microstructure and Mechanical Properties of the Thixoformed Part of Nano-Sized SiCp/7075 Composite

Jiang

Xiao

Liu

et al. 2018

Metals

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“…For the Mg-Zn-Y alloys, the magnetic field changed the orientation plane of the α-Mg phase, and the supposed refinement of the α-Mg grains was determined by the magnetic field intensity [19]. The phenomenon of the grain refinement was also observed in the Mg-Gd-Zn and Mg-Y alloys under the magnetic field, accompanied by the enhanced strength [20,21]. In addition to the refinement of the α-Mg grains, our previous study elucidated that the static magnetic field was able to refine the LPSO laths as well in the Mg-Al-Gd alloys [22].…”

Section: Introductionmentioning

confidence: 95%

Effects of Static Magnetic Field on Compression Properties of Mg-Al-Gd Alloys Containing Gd-Rich Ferromagnetic Phase

Cai

et al. 2020

Materials

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The Mg–0.6Al–20.8Gd (wt.%) alloys were homogenized at 620 °C for 20 min under 0 T and 1 T, followed by furnace cooling, quenching, and air cooling, respectively. The effects of the magnetic field on the phase constituent, microstructure, secondary phase precipitation, and mechanical properties of the Mg–Al–Gd alloys were investigated. The Mg–Al–Gd alloys contained α-Mg, Mg5Gd, Al2Gd, and GdH2 phases, and the phase constituents were hardly influenced by the applied magnetic field. However, the precipitation of the paramagnetic Mg5Gd upon cooling was accelerated by the magnetic field, and that of the ferromagnetic Al2Gd phases was inhibited. In addition, the Al2Gd phase was significantly refined and driven to segregate at the grain boundaries by the magnetic field, and the resultant pinning effect led to the microstructure change from dendritic α-Mg grains to rosette-like ones. When the magnetic field was only applied to the homogenization stage, the content of the Mg5Gd phase remained unchanged in the quenched alloy, whereas the Mg5Gd laths were significantly refined. By contrast, the contents of the Al2Gd and GdH2 phases were increased, while the precipitation sites were still within the α-Mg grains. The Mg5Gd laths were incapable of providing precipitation strengthening, while the Al2Gd and GdH2 particles brought positive effects on the enhancement of the mechanical properties. In the quenching condition, the hardness, compression strength, and ductility can be improved by the magnetic treatment, whereas these mechanical properties can be suppressed in the furnace cooled condition by the magnetic treatment.

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“…On the other hand, traditional manufacturing process including sand and permanent casting which are generally used to produce components tend to induce defects such as porosity, segregation and very coarse micro compounds to the casting products. A good way to reduce these defects is the semisolid rheocasting technology [8]. In this process, liquid metal is transformed into semisolid slurries.…”

Section: Introductionmentioning

confidence: 99%

Effect of solid fraction on microstructures and mechanical properties of a Mg-Al-La-Ca alloy processed by rheocasting

Bartex

Santos

Barcellos

et al. 2019

Journal of Alloys and Compounds

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Preparation of an Mg–Gd–Zn alloy semisolid slurry by low frequency electro-magnetic stirring

Cited by 41 publications

References 31 publications

Effect of Remelting Temperature and Soaking Time on Microstructure and Mechanical Properties of the Thixoformed Part of Nano-Sized SiCp/7075 Composite

Effect of Remelting Temperature and Soaking Time on Microstructure and Mechanical Properties of the Thixoformed Part of Nano-Sized SiCp/7075 Composite

Effects of Static Magnetic Field on Compression Properties of Mg-Al-Gd Alloys Containing Gd-Rich Ferromagnetic Phase

Effect of solid fraction on microstructures and mechanical properties of a Mg-Al-La-Ca alloy processed by rheocasting

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