The evolution of microstructure and texture of AZ80 Mg alloy cup-shaped pieces processed by rotating backward extrusion

Che, Xin; Wang, Qiang; Dong, Beibei; Meng, Ming; Gao, Ziwen; Li, Kai; Ma, Jian‐Nong; Yang, Fulai; Zhang, Zhiming

doi:10.1016/j.jma.2020.07.013

Cited by 48 publications

(6 citation statements)

References 45 publications

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“…The reduction is mainly due to the rotational shear component applied by ShAPE interacting with a scrolled die face, which promotes the flow of Mg alloy into the die orifice. Rotating backward extrusion could effectively increase the equivalent strain and deformation uniformity of the Mg alloys more than conventional indirect extrusion [ 33 ].…”

Section: Magnesium Alloy Extrusion Process and Advantagesmentioning

confidence: 99%

Research Progress on Microstructure Evolution and Strengthening-Toughening Mechanism of Mg Alloys by Extrusion

et al. 2023

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Magnesium and magnesium-based alloys are widely used in the transportation, aerospace and military industries because they are lightweight, have good specific strength, a high specific damping capacity, excellent electromagnetic shielding properties and controllable degradation. However, traditional as-cast magnesium alloys have many defects. Their mechanical and corrosion properties cause difficulties in meeting application requirements. Therefore, extrusion processes are often used to eliminate the structural defects of magnesium alloys, and to improve strength and toughness synergy as well as corrosion resistance. This paper comprehensively summarizes the characteristics of extrusion processes, elaborates on the evolution law of microstructure, discusses DRX nucleation, texture weakening and abnormal texture behavior, discusses the influence of extrusion parameters on alloy properties, and systematically analyzes the properties of extruded magnesium alloys. The strengthening mechanism is comprehensively summarized, the non-basal plane slip, texture weakening and randomization laws are comprehensively summarized, and the future research direction of high-performance extruded magnesium alloys is prospected.

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Section: Magnesium Alloy Extrusion Process and Advantagesmentioning

confidence: 99%

Research Progress on Microstructure Evolution and Strengthening-Toughening Mechanism of Mg Alloys by Extrusion

et al. 2023

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“…With an increase in strain, the sub-GBs and LAGBs transform into high angle grain boundaries (HAGBs), causing the formation of new grains with distinct boundaries, which is defined as CDRX [34]. In contrast, DDRX is a process with the serrated nucleation at HAGBs, which bulge and grow through the grain boundary migration [35]. As for TDRX mechanism, the deformation twins provide additional grain boundaries for either DDRX or CDRX to occur [36].…”

Section: Drx Mechanism Of the Extruded Zk60 Alloymentioning

confidence: 99%

Effect of extrusion temperature on the microstructure and mechanical properties of hot-extruded ZK60 magnesium alloy

Ma,

Chen

et al. 2023

Mater. Res. Express

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ZK60 magnesium alloy was prepared by the hot-pressed sintering combined with the hot-extruded technique. The microstructure and mechanical properties evolution of ZK60 alloy with a reduced extrusion temperature from 350 °C to 250 °C were investigated in detailed. The extruded alloy was mainly composed of fine α-Mg grains and MgZn2 phase. The grains size gradually decreased with a reduction in extrusion temperature, and the yield strength obviously increased accordingly. The alloy extruded at 250 °C exhibited the smallest average grain size of 2.5 μm and the best combination of strength and plasticity, with a yield strength of 279 MPa and fracture strain of 18.1% in compressive condition, and 263 MPa and 13.7% in tensile condition, as well as a tension-compression yield asymmetry of 0.94. Both the fine grains formed by the continuous and twin induced dynamic crystallization mechanism and the precipitation strengthening contributed to the strength improvement.

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“…The severe plastic deformation caused severe deformation heat effect, which maintains or even increases the material temperature by thermal diffusion. On the other hand, for magnesium alloys with low stacking fault energy metal materials during hot deformation process, massive dislocation multiply and accumulate caused by working hardening, although the dynamic recovery is accompanied by strain hardening, the dynamic recovery process is often slow and hard to simultaneously offset the dislocation proliferate and accumulation [43]. When dislocations accumulated to a certain extent, i.e.…”

Section: Feasibility Analysis Of Vccae Processmentioning

confidence: 99%

Novel process combined extrusion and severe plastic deformation for plate component with rib-web structure of magnesium alloys

Zhu

Sun

Qian

et al. 2022

Int J Adv Manuf Technol

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Plates with rib-web structure of magnesium alloys can hardly fabricated through conventional method. In this work, the variable circular channel angular extrusion (VCCAE) combined extrusion and severe plastic deformation is proposed, in which billet undergoes severe deformation at several variable circular angular channel. The FE model for VCCAE of scaling plate with ribs is established and the experimental set up is designed. The feasibility of the novel process and the accuracy of the FE model are validated by the simulations and experiments. Stress state and the effective strain distribution in longitudinal section and cross section are analyzed. The results show that stress and strain distribution in longitudinal section is extremely inhomogeneous, and obvious stress concentration at the shear plane is founded. The microstructure in angular region is more uniform and ner, which validate that the severe shear deformation induced by the angular channel in the VCCAE process could promote the deformation uniformity and grain re nement. The results of numerical simulation and experiments demonstrate that the VCCAE process proposed in this paper is feasible and it has great potential to manufacture highperformance plate with ribs.

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The evolution of microstructure and texture of AZ80 Mg alloy cup-shaped pieces processed by rotating backward extrusion

Cited by 48 publications

References 45 publications

Research Progress on Microstructure Evolution and Strengthening-Toughening Mechanism of Mg Alloys by Extrusion

Research Progress on Microstructure Evolution and Strengthening-Toughening Mechanism of Mg Alloys by Extrusion

Effect of extrusion temperature on the microstructure and mechanical properties of hot-extruded ZK60 magnesium alloy

Novel process combined extrusion and severe plastic deformation for plate component with rib-web structure of magnesium alloys

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