Improvement of magnesium alloy edge cracks by multi-cross rolling

Zhi, Chenchen; Ma, Lifeng; Huang, Qingxue; Huang, Zhiquan; Lin, Jianqun

doi:10.1016/j.jmatprotec.2017.12.022

Cited by 67 publications

(9 citation statements)

References 17 publications

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“…The drawing force and formed cup quality under the mentioned lubrication conditions were investigated for Mg-Li alloy blank with thickness of 50 µm. As Mg-Li alloy is a novel material in microforming and its applications increase considerably [23,24], various heat treated types were generated and mechanical properties were obtained from micro tensile test. A simulation model was developed based on the mentioned lubrication conditions and obtained mechanical properties for each group and ultimately the simulation and experimental results were assessed and discussed.…”

Section: Introductionmentioning

confidence: 99%

Effects of nano-particle lubrication on micro deep drawing of Mg-Li alloy

Kamali

Xie

Jia

et al. 2019

Int J Adv Manuf Technol

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Effects of various lubrication conditions on macroscale deep drawing have been investigated extensively while in microscale due to the open and closed lubrication pocket theory and friction coefficient escalation, proper lubricants concern becomes severe. Microforming is to produce lighter and more energy effective products accordingly, in this study, Magnesium-Lithium (Mg-Li) alloy is chosen to superior formed micro-cup due to its ultralight weight with outstanding ductility. Mg-Li is a new material in microscale consequently, to study the mechanical properties, heat treatment process is performed. The dry and oil lubrication conditions are chosen as benchmarks to investigate effects of TiO2 oil-based nano-additive lubricant. Finite Element (FE) modelling has been conducted and the simulated results are agreed well with the experimental results where the drawing force is significantly affected by the nano-particle. The formed cup quality regarding the surface roughness has been evaluated extensively by consideration of various parameters and the quality improvement is substantial.

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Section: Introductionmentioning

confidence: 99%

Effects of nano-particle lubrication on micro deep drawing of Mg-Li alloy

Kamali

Xie

Jia

et al. 2019

Int J Adv Manuf Technol

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“…3c), the grain is seriously broken, a large amount of distortion energy is stored in the microstructure, and the degree of grain recrystallizing is low. Zhi et al [23] indicated that after rolling under high pressure, shear bands composed of a large number of fine grains was formed along the TD and parallel to the RD. Jia et al [24] indicate that when the material rolled at lower speed (7 rpm in this paper, Fig.…”

Section: Microstructurementioning

confidence: 99%

Effect of annealing temperature on corrosion properties of rolled AZ31-Ce magnesium alloy

Ning

Kong

2020

SN Appl. Sci.

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The corrosion properties of rolled AZ31 magnesium alloy addition Ce before and after annealing at different rolling temperatures (200 °C, 250 °C, 300 °C and 350 °C) and the corrosion resistance and surface morphology of different sections of the samples were studied. The results showed that the corrosion rate and weight loss of the plate without annealing were higher than that of the plate after annealing. The corrosion resistance of the transverse direction-normal direction (TD-ND) cross section was the most, and the corrosion pits after annealing were shallower than that of unannealed samples. The low Ce element content can improve the corrosion resistance of magnesium alloy. In addition, the above properties were the best at 200 °C whether annealed or not. Fig. 8 a Area percentage after corroded of each cross section at different temperatures, b schematic diagram of grain size and morphology with different cross sections

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“…Традиционная технология изготовления тонкой листовой заготовки из магниевых сплавов подразумевает горячую пластическую деформацию слитка [3,4], например плоской прокаткой [5,6], что часто не спасает от появлений трещин на свободных поверхностях заготовок [7]. Метод горячей деформации, выбор которого обусловлен необходимостью повышения технологической пластичности магния и его сплавов [8], характеризуется следующими недостатками: большие затраты энергии, окисление, длительность цикла изготовления, значительное количество технологических и вспомогательных операций, отсутствие возможности получения мелкозернистой структуры и улучшенных свойств деформированных изделий.…”

Section: актуальность проблемы и цель работыunclassified

Analysis of non-equal-channel angular pressing scheme applied for obtaining magnesium sheet in cold state

Логинов¹,

Volkov

Kamenetskii

2019

Izv.VUZ. Tsvet. Met.

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Deformation patterns of rolling, equal-channel angular pressing and non-equal-channel angular pressing were evaluated. It is noted that when rolling, it is difficult to transfer a circular section preform into a rectangular section with a small thickness. This problem cannot be solved using equal-channel angular pressing. In connection with this, it is proposed to use a non-equal-channel angular pressing pattern to study the cast structure of magnesium. An experimental procedure based on cold extrusion of cylinders with a diameter of 42 mm and a height of 40 mm is described. The strip at the outlet was 40 mm in width and 1 mm in thickness. The percentage reduction of the preform material determined by the ratio of areas was 96 % with a draw ratio of 17. The specific pressures on the punch at the beginning ofthe extrusion process were 1200—1300 MPa, and extrusion force was 1670—1800 kN. The preform was cut into lengths that were rolled at a room temperature into 50 and 10 pm thick foils without intermediate annealing. Rolling was carried out on the Duo mill with a percentage reduction of 12—20 % at an average speed of 0,1 m/s. 20 passes were performed with a total relative reduction of 95 % to make the 50 pm thick foil. The results of computer simulation by the finite element method demonstrated that the constant value of the deformation degree is achieved at a rather considerable distance from the front end estimated as 50 times the thickness of the strip. The deformation rate field was calculated to determine the configuration of the deformation center. Energy costs were estimated. As a result of the completed set of calculated and experimental work, it was possible to establish the following — it is possible to produce a thin sheet preform from a cylindrical cast magnesium blank in one operation at a room temperature. The sheet blank has a level of ductility sufficient for subsequent sheet rolling. The sheet blank obtained in the proposed process has a high level of plastic deformation elaboration created due to the forming pattern with the high level of elongation and shear deformation. Despite the high level of pressure that must be applied to create a comprehensive compression scheme taking into account the lack of the need to heat the preform, energy costs are no higher than in traditional treatment processes.

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Improvement of magnesium alloy edge cracks by multi-cross rolling

Cited by 67 publications

References 17 publications

Effects of nano-particle lubrication on micro deep drawing of Mg-Li alloy

Effects of nano-particle lubrication on micro deep drawing of Mg-Li alloy

Effect of annealing temperature on corrosion properties of rolled AZ31-Ce magnesium alloy

Analysis of non-equal-channel angular pressing scheme applied for obtaining magnesium sheet in cold state

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