Effect of Ca addition on microstructure of twin-roll cast AZ31 Mg alloy

Bae, Geun Tae; Bae, Jun Ho; Kang, Daehyun; Lee, Hakcheol; Kim, Nack J.

doi:10.1007/s12540-009-0001-3

Cited by 58 publications

(34 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It should be noted that the stress-strain curve of the compression specimen showed curvature change at the early stage of deformation (strain < 0.2), a trend that is clearly different from that of the torsion test. As reported in previous works [18,19], the curvature change originates from the occurrence of tensile twinning during the compression test. Moreover, the present study Table 1.…”

Section: Flow Curves Of Compression and Torsion Testssupporting

confidence: 72%

Effect of stress state on the high temperature workability of AZ31 Mg alloy

et al. 2010

View full text Add to dashboard Cite

The influence of stress state on the high temperature workability of rolled AZ31 Mg alloy was investigated on the basis of a processing map. To construct the processing map, high temperature compression tests were carried out on samples oriented parallel to the rolling direction at various temperatures (25°C~450°C) and strain rates (10, and then the results were compared with those of a torsion test. The overall efficiency profiles of both the compression and torsion processing maps were similar to each other, but the index of dissipation efficiency in the torsion was somewhat lower than that in the compression. The microstructure of the compressed specimens revealed much finer grained structure than that of the torsion specimens. Such microstructural differences were attributed to the different tendencies of twin formation and texture evolution depending on the stress state.

show abstract

Section: Flow Curves Of Compression and Torsion Testssupporting

confidence: 72%

Effect of stress state on the high temperature workability of AZ31 Mg alloy

et al. 2010

View full text Add to dashboard Cite

show abstract

“…As the demand for reducing CO 2 emissions and increasing the fuel efficiency grows, magnesium alloys have received an increasing amount of attention as structural materials due to their excellent properties, such as their high specific strength, low density and stiffness [1][2][3]. Since the c/a ratio of the hexagonal close-packed (hcp) magnesium lattice is less than √ 3, extruded magnesium alloys, which have a strong basal texture, show large yield asymmetries between tension and compression due to the twinning effects during compression along the prior extruded direction [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Low cycle fatigue properties and an energy-based approach for as-extruded AZ31 magnesium alloy

et al. 2011

View full text Add to dashboard Cite

Low cycle fatigue tests were conducted to investigate the cyclic deformation behavior and the energy-based criterion of AZ31 magnesium alloy. The alloy exhibited an asymmetric hysteresis loop due to the twinning and detwinning effect. The cyclic stress responses showed cyclic hardening at all total strain amplitudes. To evaluate the plastic strain energy, the Halford-Morrow equation and a modified equation for magnesium alloy were compared. The effect of twinning on the total plastic strain energy dissipated during fatigue life was discussed. The variations of the twin and dislocation densities were also investigated using optical microscopy and transmission electron microscopy, respectively.

show abstract

“…[1][2][3][4] To this end, active research attempts have been made recently and successful results have been reported for valve metals by a utilizing microarc discharge oxidation (MDO) technique where dielectric breakdown were readily promoted on the anode by plasma-assisted high energy. [5][6][7] Depending on the substrates, metal oxide films with thin thicknesses were generated during the MDO coating so as to enhance corrosion and wear resistances.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pulse Frequency on Corrosion Behavior of AZ91 Mg Alloy Treated by Microarc Discharge Oxidation Coating

Hwang

Lee

et al. 2011

Mater. Trans.

View full text Add to dashboard Cite

The paper demonstrated the anti-corrosion properties of an AZ91 Mg alloy fabricated via microarc discharge oxidation under an AC condition with various pulse frequencies ranging from 60 Hz to 2000 Hz. The structural features and phase compositions of the coating layers were characterized by utilizing scanning electron microscope and X-ray photoelectron spectroscopy. The optimum frequency for the coating layers with thick, uniform thicknesses was found to be 500 Hz for the conditions used in this study. This fact was explained by the change in the mode of spark discharge during coating, resulting in the occurrence of surface cracks as well as the transformation of Mg(OH) 2 to MgO. Potentio dynamic polarization tests in 3.5 mass% NaCl solution revealed that the sample coated at a frequency of 500 Hz exhibited a corrosion potential of À1:42 V (vs. Ag/AgCl), suggesting a better corrosion resistance as compared to the other conditions.

show abstract

Effect of Ca addition on microstructure of twin-roll cast AZ31 Mg alloy

Cited by 58 publications

References 17 publications

Effect of stress state on the high temperature workability of AZ31 Mg alloy

Effect of stress state on the high temperature workability of AZ31 Mg alloy

Low cycle fatigue properties and an energy-based approach for as-extruded AZ31 magnesium alloy

Effect of Pulse Frequency on Corrosion Behavior of AZ91 Mg Alloy Treated by Microarc Discharge Oxidation Coating

Contact Info

Product

Resources

About