Microstructure evolution and mechanical response of extruded AZ31B magnesium alloy sheet at large strains followed by annealing treatment

Dong, Jingren; Dong, Yufeng; Chai, Sensen; Pan, Fusheng

doi:10.1016/j.msea.2014.09.057

Cited by 25 publications

(4 citation statements)

References 28 publications

(37 reference statements)

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“…Meanwhile, the plasticity of AZ31B was improved with the increase in temperature under the constant strain rate. The reason for this phenomenon was that the formability of AZ31B was mainly determined based on the competing hardening and softening [24]. At the lower temperature, the density of dislocation increased and proliferated rapidly during the deformation process, which caused the dislocation movement to become more and more difficult.…”

Section: Mechanical Propertymentioning

confidence: 99%

Strain Rate and Temperature Effects on Formability and Microstructure of AZ31B Magnesium Alloy Sheet

Xue

Yang

Liu

et al. 2022

Metals

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Magnesium alloys play an important role in lightweight structures, which are extensively used in different industries due to their excellent mechanical and physical properties. In this paper, the formability of the AZ31B magnesium alloy sheet was studied by using tensile tests at different temperatures (from 25 to 250 °C) and strain rates (from 0.017 s−1 to 0.34 s−1). The results showed that the material behaves with positive temperature sensitivity when forming at a temperature lower than 200 °C. The effect of the strain rates on the formability of AZ31B was larger at high temperatures. The metallography of AZ31B at different temperatures and strain rates was observed by OM. The results showed that the partially recrystallized structure was exhibited at a temperature of 150 °C. With the increase in temperature, the approximate complete recrystallization was exhibited at a temperature of 250 °C. The fracture morphology of AZ31B was observed at different strain rates and temperatures by SEM. Additionally, the main fracture pattern was quasi-cleavage at room temperature. However, with the increase in temperature, the fracture pattern was transited from a quasi-cleavage pattern to a ductile fracture pattern. The ductile fracture pattern was the main fracture pattern at a temperature of 250 °C.

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Section: Mechanical Propertymentioning

confidence: 99%

Strain Rate and Temperature Effects on Formability and Microstructure of AZ31B Magnesium Alloy Sheet

Xue

Yang

Liu

et al. 2022

Metals

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show abstract

“…V i e w 32) , AZ alloys [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] and Mg-Zn-X alloys [51][52][53][54][55][56][57] means Mg-Al-Mn alloys, Mg-Al-Zn alloys and Mg-Zn-(RE or Ca) alloys, respectively. A d v a n c e V i e w…”

Section: A D V a N C Ementioning

confidence: 99%

Relationship between Calculated Segregation, Texture and Room Temperature Formability of Binary Magnesium Alloys

Tachi

Suzuki

Huang

et al. 2021

J. Japan Inst. Metals and Materials

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Amounts of segregation at grain boundaries of Mg-0.05at％X (X = Al, Bi, Ca, Ce, Gd, Nd, Y, Zn, Zr) alloys were calculated by using the Hillert's grain boundary phase model. As a result, relatively high grain boundary segregation was obtained in each case of Ca, Ce, Nd, Y and Zn. In addition, the basal plane texture and Erichsen value of the alloys were experimentally investigated, which exhibits a similar tendency to the previous experiments, i.e., the Erichsen value decreases with decreasing basal texture intensity. High-angle annular dark-field STEM (HAADF-STEM) analysis of the Mg-0.4Nd (mass％) and Mg-0.2Y (mass％) sheets elucidated that the uniform grain boundary segregation was detected in Mg-0.4Nd, while the localized and scattered segregation region was observed at grain boundary in Mg-0.2Y. These segregation behaviors were explained by the concept of critical element concentration proposed by Griffiths. An un-recrystallized grain microstructure with high lattice distortion was observed in Mg-0.4Nd in Scanning Electron Microscope -Electron Back-Scatter Diffraction (SEM-EBSD) analysis, which leads to a possibility that the grain boundary segregation of Nd contributes to the suppression of recrystallization during rolling. As the strong correlation was observed between the calculated grain boundary segregation and the experimental basal texture intensity, the amount of grain boundary segregation is a useful parameter for describing basal texture intensity of binary Mg alloys.

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“…The forming limit of AAx610-T4PD aluminum alloy can be greatly improved by applying a pre-strain of 0.1 and the following intermediate annealing, according to the work by Zhang et al [11] . Pan et al [12][13] studied the influence of pre-stretching and pre-compression on the cup bulging ability of the AZ31 magnesium alloy sheet. It was found that the base texture was gradually weakened and dispersed after pre-strain and heat treatment, which causes a high hardening index n value and increasing cupping value.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-strain on microstructure and stamping ability of TA2 titanium alloy and H260 low-alloy steel

Liu

Wen

Wang

et al. 2023

J. Phys.: Conf. Ser.

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Applying pre-strain can not only change the microstructure and the mechanical property of metal material but also affect sheet metal stamping ability. In this paper, taking H260 low-alloy steel and TA2 titanium alloy as experimental materials, pre-strain ranging from 0 to 0.16 was applied using the one-step and the multi-step method respectively. Microstructure observation, tensile test, bending test, and cup bulging test were conducted on the pre-strained samples. Results show that in the pre-strain loading stage, the slipping and twinning deformation occurs in the TA2 alloy sample while dislocation sliding mainly happens in H260 low-alloy. With pre-strain increasing, the product of ultimate tensile strength and elongation rate gradually decreases, and the true ultimate tensile stress and accumulating elongation change rarely. The “product of yielding strength and elongation rate” can be enhanced by applying a pre-strain of 0.04 on the condition that plasticity is still at a high level. In the pre-strain range of 0 - 0.16, a bending test with a 30.8 °-opening angle can be completed on H260 steel. The springback angle changes from negative to positive with an increase in pre-strain. The bending ability of TA2 titanium alloy is very poor, for a crack can easily occur even in the original sample. The cupping value decreases gradually with an increase in pre-strain. The cupping value of TA2 titanium alloy is higher than that of H260 low alloy steel for the constant pre-strain. A quite large difference exists between the two experimental materials. Pre-strain loading pass has no significant effect on the microstructure evolution, mechanical properties, and stamping properties.

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Microstructure evolution and mechanical response of extruded AZ31B magnesium alloy sheet at large strains followed by annealing treatment

Cited by 25 publications

References 28 publications

Strain Rate and Temperature Effects on Formability and Microstructure of AZ31B Magnesium Alloy Sheet

Strain Rate and Temperature Effects on Formability and Microstructure of AZ31B Magnesium Alloy Sheet

Relationship between Calculated Segregation, Texture and Room Temperature Formability of Binary Magnesium Alloys

Effect of pre-strain on microstructure and stamping ability of TA2 titanium alloy and H260 low-alloy steel

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