Influence of rolling speed on microstructure and mechanical properties of AZ31 Mg alloy rolled by large strain hot rolling

Guo, Fei; Zhang, Dingfei; Yang, Xusheng; Jiang, Luyao; Chai, Sensen; Pan, Fusheng

doi:10.1016/j.msea.2014.04.024

Cited by 70 publications

(23 citation statements)

References 33 publications

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“…It should be noted that twinning was still the main deformation behaviour as increasing the rolling speed. This phenomenon was different from the results of AZ31 Mg alloy sheets rolled by large strain hot rolling [18], high speed rolling [16], high strain-rate rolling [15]. Guo et al [18]suggested that the DRX behaviour of the AZ31 Mg alloy rolled by large strain hot rolling (about 55%thickness reduction in one single pass) was obviously extended with increasing rolling speed.…”

Section: Resultsmentioning

confidence: 87%

“…This phenomenon was different from the results of AZ31 Mg alloy sheets rolled by large strain hot rolling [18], high speed rolling [16], high strain-rate rolling [15]. Guo et al [18]suggested that the DRX behaviour of the AZ31 Mg alloy rolled by large strain hot rolling (about 55%thickness reduction in one single pass) was obviously extended with increasing rolling speed. Sanjari et al [16] found that the high-speed rolling AZ31 alloy sheet with a reduction thickness of 60% at one single pass exhibited a completed DRX structure.…”

Section: Resultsmentioning

confidence: 87%

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Effect of the final rolling speeds on the stretch formability of AZ31 alloy sheet rolled at a high temperature

Zhou

Zhao

et al. 2015

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 87%

Effect of the final rolling speeds on the stretch formability of AZ31 alloy sheet rolled at a high temperature

Zhou

Zhao

et al. 2015

Journal of Alloys and Compounds

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“…Grain size is important in determining strength as is indicated by the Hall-Petch relationship [16][17][18][19][20]. For magnesium alloy sheets, finer grains have been achieved by severe plastic deformation.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Deformation mechanism and microstructure evolution during on-line heating rolling of AZ31B Mg thin sheets

Pan

Zeng

Jiang

et al. 2017

Materials Characterization

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An AZ31B sheets were processed by on-line heating rolling (ON-LHR) in five passes. Roll and sheets temperatures were 473 K and 533 K, respectively. The grain size was reduced in the first three roll passes, to a minimum of 4.1 μm, due to dynamic recrystallization, and coarsened in the last two passes due to a combination of dynamic recrystallization and grain growth. The yield strength, ultimate tensile strength and elongation to fracture reached 232 MPa, 347 MPa and 21% in the rolling direction. The maximum yield strength occurred after the fourth pass. The maximum is attributed to the small grain size and the formation of networks of sub-grains and deformed grains. The rolled sheets had a strong basal texture, which was largely unchanged with the number of roll passes. The existence of the strong texture after rolling indicated discontinuous dynamic recrystallization.

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“…Shear bands or crack could be produced at low SPD speed in magnesium alloy [28,29], which is harmful for its usage. As SPD speed increasing, dynamic recrystallization (DRX) behavior is dramatically enhanced by high temperature [28,30]. For low speed LSEM magnesium alloys, Efe et al first suppressed the crack initiation in magnesium alloy sheet by high hydrostatic pressure [29].…”

Section: Introductionmentioning

confidence: 99%

A new method for grain refinement in magnesium alloy: High speed extrusion machining

Liu

Cai

Dai

2016

Materials Science and Engineering: A

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a b s t r a c tMagnesium alloys have received broad attentions in industry due to their competitive strength to density ratio, but the poor ductility and strength limit their wide range of applications as engineering materials. A novel severe plastic deformation (SPD) technique of high speed extrusion machining (HSEM) was used here. This method could improve the aforementioned disadvantages of magnesium alloys by one single processing step. In this work, systematic HSEM experiments with different chip thickness ratios were conducted for magnesium alloy AZ31B. The microstructure of the chips reveals that HSEM is an effective SPD method for attaining magnesium alloys with different grain sizes and textures. The magnesium alloy with bimodal grain size distribution has increased mechanical properties than initial sample. The electron backscatter diffraction (EBSD) analysis shows that the dynamic recrystallization (DRX) affects the grain refinement and resulting hardness in AZ31B. Based on the experimental observations, a new theoretical model is put forward to describe the effect of DRX on materials during HSEM. Compared with the experimental measurements, the theoretical model is effective to predict the mechanical property of materials after HSEM.

show abstract

Influence of rolling speed on microstructure and mechanical properties of AZ31 Mg alloy rolled by large strain hot rolling

Cited by 70 publications

References 33 publications

Effect of the final rolling speeds on the stretch formability of AZ31 alloy sheet rolled at a high temperature

Effect of the final rolling speeds on the stretch formability of AZ31 alloy sheet rolled at a high temperature

Deformation mechanism and microstructure evolution during on-line heating rolling of AZ31B Mg thin sheets

A new method for grain refinement in magnesium alloy: High speed extrusion machining

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