Ductility Enhancement in Magnesium Alloys under Dynamic Loading

Mukai, Toshiji; Yamanoi, Masashi; Higashi, Kenji

doi:10.4028/www.scientific.net/msf.350-351.97

Cited by 19 publications

(10 citation statements)

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“…Generally, it has been said that the less cold workability of magnesium results from its limited slip system at room temperature. Recently, however, there are some instances [1][2][3][4] where the ductility is improved in grain-refined magnesium alloys even at room temperature. This suggests that the poor ductility of magnesium relates to microstructural conditions, and not necessarily to intrinsic nature of the material.…”

Section: Introductionmentioning

confidence: 99%

Effect of Microstructural Factors on Tensile Properties of an ECAE-Processed AZ31 Magnesium Alloy

et al. 2003

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Mg-3%Al-1%Zn (AZ31) alloy was subjected to ECAE (Equal Channel Angular Extrusion) processing under various processing conditions. Then tensile tests were carried out at room temperature to investigate the relationship between tensile properties and microstructural parameters that include grain size and the texture generated by ECAE processing. In 4-pass ECAE specimens processed at 523 K, tensile ductility is improved as a result of easy basal slip during tensile test along the extrusion direction, because such specimens have textures in which the basal plane is inclined at 45 to the extrusion direction. On the other hand, in the specimens processed at 573 K, 0.2% proof stress is higher than those of specimens processed at lower temperatures, but elongation is smaller. This is because of difficult basal slip caused by the textures in which the basal plane is oriented parallel to the extrusion direction. However, 8-pass specimens processed at 473 K and subsequently annealed, which have similar textures but different grain sizes (d), exhibit clear grain size dependencies of 0.2% proof stress ( 0:2 ) according to Hall-Petch relationship; 0:2 ¼ 30 þ 0:17d À1=2 . Therefore, crystallographic orientation has a profound effect on the tensile properties of AZ31 alloy, and grain size has a little effect.

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Section: Introductionmentioning

confidence: 99%

Effect of Microstructural Factors on Tensile Properties of an ECAE-Processed AZ31 Magnesium Alloy

et al. 2003

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“…In particular, the effects of higher strain rate and sheet orientation on deformation mechanisms, yield strength and flow stress asymmetry and anisotropy are still unknown. The compression deformation studies carried out to date have dealt mostly with extruded and cast AZ and AM alloys [17,18]. It has been reported that ductility increases with increasing strain rate owing to an increase in the rate sensitivity.…”

Section: Introductionmentioning

confidence: 99%

“…The high strain rate behaviour is of great interest to the automotive and aircraft sectors, because the dynamic response of components must be known to support design and simulation for severe loading conditions, such as crash or impact [15,16]. Mukai et al [17] investigated the effect of grain size and observed that the ductility and tensile strength of the investigated magnesium alloy were increased at high rates of strain. El-Magd & Abouridouane [18] observed an increase in ductility for extruded AZ80 magnesium alloy under dynamic compressive loading.…”

Section: Introductionmentioning

confidence: 99%

Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Kurukuri

Worswick

Tari

et al. 2014

Phil. Trans. R. Soc. A.

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The constitutive response of a commercial magnesium alloy rolled sheet (AZ31B-O) is studied based on room temperature tensile and compressive tests at strain rates ranging from 10 −3 to 10 3 s −1 . Because of its strong basal texture, this alloy exhibits a significant tension–compression asymmetry (strength differential) that is manifest further in terms of rather different strain rate sensitivity under tensile versus compressive loading. Under tensile loading, this alloy exhibits conventional positive strain rate sensitivity. Under compressive loading, the flow stress is initially rate insensitive until twinning is exhausted after which slip processes are activated, and conventional rate sensitivity is recovered. The material exhibits rather mild in-plane anisotropy in terms of strength, but strong transverse anisotropy ( r -value), and a high degree of variation in the measured r -values along the different sheet orientations which is indicative of a higher degree of anisotropy than that observed based solely upon the variation in stresses. This rather complex behaviour is attributed to the strong basal texture, and the different deformation mechanisms being activated as the orientation and sign of applied loading are varied. A new constitutive equation is proposed to model the measured compressive behaviour that captures the rate sensitivity of the sigmoidal stress–strain response. The measured tensile stress–strain response is fit to the Zerilli–Armstrong hcp material model.

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“…Recently, there has been a great interest in using lightweight materials for automotive [1][2][3][4][5][6][7] and aerospace components. [1][2][3] Magnesium is expected to become the best alternative material for lightweight components due to its low density.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Magnesium is expected to become the best alternative material for lightweight components due to its low density. Magnesium offers several advantages: low density (1.74 g/cm 3 ), 8) outstanding damping capacity, 9) dimensional stability, 5) and high specific strength and stiffness. 1,10) In addition to these basic characteristics, its high recyclability at low energy cost is favored to significantly reduce environmental pollution.…”

Section: Introductionmentioning

confidence: 99%

Superplastic Forming of AZ31 Magnesium Alloy Sheet into a Rectangular Pan

2002

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Superplastic behaviour of Mg-alloy AZ31 was investigated to clarify the possibility of its use for superplastic forming (SPF) and to accurately evaluate material characteristics under a biaxial stress by utilizing a multi-dome test. The material characteristics were evaluated under three different superplastic temperatures, 643, 673, and 703 K in order to determine the most suitable superplastic temperature. Finite Element Method (FEM) simulation of rectangular pan forming was carried out to predict the formability of the material into a complex shape. The superplastic material properties are used for the simulation of a rectangular pan. Finally, the simulation results are compared with the experimental results to determine the accuracy of the superplastic material characteristics. The experimental results revealed that the m values are greater than 0.3 under the three superplastic temperatures, which is indicative of superplasticity. The optimum superplastic temperature is 673 K, at which a maximum m value and no grain growth were observed. The results of the FEM simulation revealed that certain localized thinning occurred at the die entrance of the deformed rectangular pan due to the insufficient ductility of the material. The simulation results also showed that the optimum superplastic temperature of AZ31 is 673 K.

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Ductility Enhancement in Magnesium Alloys under Dynamic Loading

Cited by 19 publications

References 0 publications

Effect of Microstructural Factors on Tensile Properties of an ECAE-Processed AZ31 Magnesium Alloy

Effect of Microstructural Factors on Tensile Properties of an ECAE-Processed AZ31 Magnesium Alloy

Rate sensitivity and tension–compression asymmetry in AZ31B magnesium alloy sheet

Superplastic Forming of AZ31 Magnesium Alloy Sheet into a Rectangular Pan

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