Mechanism of grain refinement of aluminium alloy in shear spinning under different deviation ratios

Zhan, Mei; Wang, Xianxian; Long, Hui

doi:10.1016/j.matdes.2016.06.095

Cited by 32 publications

(6 citation statements)

References 29 publications

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“…The main strengthening alloy elements are Zn and Mg. The precipitation sequence of the alloy during aging treatment is: supersaturated solid solution (SSS) → solutevacancy → GP zone→ intermediate phase η′ or T′ → equilibrium phase η(MgZn2) or T(Mg32(Al, Zn)49) [8,9]. η′ is semi-coherent with the Al matrix, which is the main strengthening phase, and η is with the Al matrix, which results in a significant reduction in its strengthening effect [10].…”

Section: Figure 5 Positions Of Micro Hardness Measurement and Microstructure Observationmentioning

confidence: 99%

study on laser-assisted spinning of aged Aluminum alloy sheet

Wang

Ran

et al. 2021

METAL 2021 Conference Proeedings

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Section: Figure 5 Positions Of Micro Hardness Measurement and Microstructure Observationmentioning

confidence: 99%

study on laser-assisted spinning of aged Aluminum alloy sheet

Wang

Ran

et al. 2021

METAL 2021 Conference Proeedings

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“…Результаты исследования изменения микроструктуры при различных режимах деформирования в процессе формовки листовых изделий обкаткой роликами представлены в [Zhan et al, 2016]. Эксперименты проведены на образцах из алюминиевого сплава 3A21, заготовкакруглый в плане лист диаметром 290 мм и толщиной 6 мм, получаемая детальусеченный конус.…”

Section: методы и результаты экспериментальных исследований полученияunclassified

The grain structure refinement of metals and alloys under severe plastic deformation: experimental data and analysis of mechanisms

Ostanina

В²,

Shveykin

et al. 2020

PNRPU Mechanics Bulletin

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Wide opportunities of using fine-grained materials as structural and functional materials with advanced physical and mechanical properties have proved the importance of improving the existing technology and creating new processing methods and treatment conditions for such ma-terials. At the same time, a preliminary theoretical analysis using mathematical models gives an opportunity to significantly reduce the cost of such experimental studies. Thus, it is necessary to develop multilevel models of polycrystalline metals and alloys based on crystal plasticity with the description of structure, deformation mechanisms and refinement at various scale levels. To con-struct a correct model of such a class, it is necessary to analyze information and arrange a large amount of experimental data about grain structure refinement. The article presents a review of the experimental studies describing and analyzing the grain structure refinement during severe plastic deformations of various metal alloys. The refine-ment mainly occurs at low temperatures that are a priori lower than the temperatures at which re-crystallization becomes an important factor and the solid-state phase transitions may take place. We have summarized the significant physical mechanisms of the grain refinement during cold deformation based on the arranged experimental data from the review. All the considered articles pay attention to the local accumulation of lattice dislocations inside the grains (in the form of flat clusters), which leads to the lattice curvature and separation of grains into cells. As a result of a further accumulation of dislocations in the walls, there comes an increase in misorientation of the neighboring cells. The curved lattice is unstable (it seems clear that the flat clusters become a source of such curvatures) and relaxes with the formation and movement of the partial disclina-tions, which leads to the rotation of the adjacent grain regions and creation of new grain bounda-ries. In addition, the mesoscale defects located at the junctions of the grains (including the boundary intersection disclinations), flat clusters of the dislocations of the orientational mismatch at the grain boundaries and partial dislocations in the grains have a significant effect on the frag-mentation. The articles about the severe plastic deformation at high temperatures are briefly de-scribed here. It is noted that recrystallization is the main mechanism of the fine-grained structure formation under these conditions. We suggest including the description of the discussed mechanisms in the multilevel con-stitutive material models. When new experimental data appear for a specific process of the severe plastic deformation, the considered refinement mechanisms can be added.

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“…It can be found that the tensile strengths after deformation are all greater than the initial blank for all different zones and directions. Zhan et al [25] have reported that significant work hardening and grain refinement will produce in the power spinning of aluminum alloy. Thus, the tensile strength is improved during power spinning.…”

Section: Microstructure and Mechanical Propertiesmentioning

confidence: 99%

Power Spinning of the Curved Head with Tailor Welded Aluminum Alloy Blank: Deformation, Microstructure, and Property

Ma¹,

Gao

et al. 2019

Metals

Self Cite

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The power spinning of tailor-welded blank (TWB) provides a feasible way to form the large-scale curved heads of aluminum alloy. However, the inhomogeneous material property of TWB produces different and more complex spinning behaviors compared with the traditional spinning of an integral homogenous blank. In this research, the deformation characteristics, microstructure, and the properties of the power spun curved head with aluminum alloy TWB were studied. A finite element model considering the inhomogeneous material property of welded blank is developed for the analysis of the power spinning process. To conduct accurate and efficient simulation, an effective meshing method is proposed according to the feature of TWB. The simulation and experimental results show that the weld zone (WZ) presents the larger equivalent stress but smaller equivalent strain than base material zone (BMZ) in power spinning due to its larger deformation resistance. Under the combined effects of the spiral local loading path and inhomogeneous deformability of TWB, the equivalent strain near the weld zone has an asymmetric V-shaped distribution. Strain inhomogeneity gradually increases with deformation and leads to an increase of the flange swing degree. In addition, the circumferential thickness distribution is relatively uniform, which is little affected by the existence of the weld line. However, the circumferential unfitability distribution becomes non-uniform and the roundness is worsened due to the existence of the weld line. Compared to the initial blank, the microstructure in WZ and BMZ are both elongated after spinning. The tensile strength is improved but plasticity reduced after power spinning based on the circumferential and radial tests of WZ and BMZ. The results are of theoretical and technical guidance for the power spinning of the curved head component with TWB.

show abstract

Mechanism of grain refinement of aluminium alloy in shear spinning under different deviation ratios

Cited by 32 publications

References 29 publications

study on laser-assisted spinning of aged Aluminum alloy sheet

study on laser-assisted spinning of aged Aluminum alloy sheet

The grain structure refinement of metals and alloys under severe plastic deformation: experimental data and analysis of mechanisms

Power Spinning of the Curved Head with Tailor Welded Aluminum Alloy Blank: Deformation, Microstructure, and Property

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