Effect of local strains on the texture and mechanical properties of AZ31 magnesium alloy produced by continuous variable cross-section direct extrusion (CVCDE)

Li, F.; Zeng, Xiang; Chen, Q.; Cao, Guojian

doi:10.1016/j.matdes.2015.06.168

Cited by 23 publications

(3 citation statements)

References 30 publications

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“…Accordingly, Mg expresses rather poor mechanical properties and formability at RT. It is accepted that grain refinement improves the aforementioned properties of Mg alloys [4,5,6]. Within this frame, severe plastic deformation (SPD), especially equal channel angular pressing (ECAP), revealed to be one of the most effective grain refining methods for metallic materials.…”

Section: Introductionmentioning

confidence: 99%

Effects of texture and grain size on mechanical properties of AZ80 magnesium alloys at lower temperatures

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Effects of texture and grain size on mechanical properties of AZ80 magnesium alloys at lower temperatures

et al. 2016

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“…Figure 12c shows the misorientation angle distribution. The fiber texture components can be represented by <0001>∥ND and <10 1 0>∥TD, which is a typical deformation texture component generated in Ti-3Al-2.5V rolled tubes because of the critical resolved shear stress (CRSS) of slip system in HCP, same to AZ31 alloy [29,30]. In order to observe the microstructure evolution in the hot gas forming process, the microstructure of the 55 % and calibration part in Fig.…”

Section: Microstructural Evolutionmentioning

confidence: 99%

Loading path and microstructure study of Ti-3Al-2.5V tubular components within hot gas forming at 800 °C

Liu

Wang

et al. 2016

Int J Adv Manuf Technol

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Hot tube gas forming is a forming technology, whose ultimate goal is forming a uniform cross-section blank tube into a complex shape die cavity with varying crosssections without necking, wrinkling, or buckling by applying of axial feeding and internal pressure at elevated temperature. In this paper, the effects of feeding speed and internal pressure on the quality of formed tubular components were studied by theoretical analysis, FEM simulation, and experiment. The microstructure evolutions at four typical positions were analyzed by electron back-scattered diffraction (EBSD). The mechanical properties of tubular component were tested by the uniaxial tensions and hardness tests. A good tubular component can be formed under a two-stage loading path at 800°C, the feeding speed is 0.1 mm/s and the internal pressure is 5 MPa during the first feeding stage while the feeding speed is 0.2 mm/s and the internal pressure is 7 MPa during the second feeding stage. At the forming zone, the grains are significantly elongated along the hoop direction. Compared with the as-received tube, the tensile strength of parts reduces about 6 % along axial direction.Titanium alloys are found extensive applications including aerospace, marine, chemical, and medical industries due to their excellent properties such as good high temperature performance, high specific strength, good creep resistance, biocompatibility, and good corrosion resistance [1]. Ti-alloy complex tubular components are widely used in petrochemical equipment, vehicle exhaust system, sports equipment and piping system of ship, air-inlet system, and hydraulic control system of aerospace and aviation [2, 3]. However, for titanium alloy, it is hard to be formed at room temperature because of high springback and low plasticity. The problems can be counteracted by improving the forming temperature. In recent years, superplastic forming (SPF) were popularly used to form complex components at elevated temperature [1,4,5]. Nevertheless, the disadvantages of localized thinning, expensive microstructure refining processing, low productive efficiency, and high deforming temperature in superplastic forming limit applications of Ti-alloy SPF. Thus, it is urgent need to develop a forming technology with low energy consumption, high efficiency, and without microstructure refining processing.Quick plastic forming, developed by General Motors to form AA5083 aluminum automobile body panels, affords comparable capabilities yet at higher production rates due to lower forming temperature, higher strain rates, and without refining grains [5,6]. R. Neugebauer [7], A.W. Dykstr [8], W. Xin [9], and B. Dykstra [10] set up hot metal gas forming (HMGF), and mainly investigated and applied the process on forming of aluminum and magnesium alloy components. J. Liu [11,12], utilizing the mechanical pre-forming, investigated the AA5083 sheet gas forming using argon gas at 400°C. W.J. Kim [13] formed an Al-Mg-Cr aluminum suspension component successfully at 520°C under a constant gas pressure of 7 MPa d...

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“…Li et al [14] demonstrated that the unique discrete stem design and loading mode of the AFE method can maximize shear stress, AFE is a new extrusion method with great potential and integration of formability. AFE adopts double punch extrusion technology, and the grain size of magnesium alloy has been dramatically refined.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization Mechanism and Texture Evolution during Interactive Alternating Extruded Magnesium Alloy

Gao

Feng

et al. 2023

Acta Metall. Sin. (Engl. Lett.)

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Alternating extrusion (AFE) is a new way to effectively alter the texture and enhance the mechanical properties of the extruded bars. However, the mechanisms of microstructure evolution and enhancement of hardness are still unknown by different extrusion ratios (ERs) during extrusion. This work systematically investigated the microstructure and hardness of AZ31 alloy with various extrusion ratios of 8.1, 15.6, and 24.8 by electron backscattered diffraction. The most striking result to emerge from the data is that when the ERs were increased from 8.1 to 15.6, the grain size was refined to 7.13 μm. However, when the ER reached 24.8, the average grain size was 11.43 μm. The proportion of recrystallization was only 2.92%, there was a continuous rotation of sub-grains at coarse grain boundaries, and non-basal slip < a > dislocations were activated and enriched near low-angle grain boundaries. At present, the recrystallization has not been completed. The grains of the product are coarsened, and the hardness is reduced. When λ = 15.6, the AFE has a significant grain refinement effect and the highest hardness value.

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Effect of local strains on the texture and mechanical properties of AZ31 magnesium alloy produced by continuous variable cross-section direct extrusion (CVCDE)

Cited by 23 publications

References 30 publications

Effects of texture and grain size on mechanical properties of AZ80 magnesium alloys at lower temperatures

Effects of texture and grain size on mechanical properties of AZ80 magnesium alloys at lower temperatures

Loading path and microstructure study of Ti-3Al-2.5V tubular components within hot gas forming at 800 °C

Dynamic Recrystallization Mechanism and Texture Evolution during Interactive Alternating Extruded Magnesium Alloy

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