Twinning deformation in magnesium compressed along the C-axis

Yoshinaga, Hideo; Obara, Takashi; Morozümi, Shotaro

doi:10.1016/0025-5416(73)90036-0

Cited by 114 publications

(56 citation statements)

References 7 publications

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“…Accordingly, the dominance of compatibility stress in the materials with finer grain size provides the activation stress for <c+a> slip and limits the stable hardening at lower strain. This can be understood in light of the report by yoshinaga et al [42], in that the <c+a> dislocations are split to mobile <a> and immobile <c> components which contribute to severe strain hardening, causing harmful effects on formability at room temperature. This explanation rationalized higher maximum stress as well as lower strain-to-fracture obtained for the material with lower mean grain size.…”

Section: Resultsmentioning

confidence: 86%

Compressive Deformation Behavior of an Ultrafine/Nano Grained AZ31 Magnesium Processed by Accumulative Back Extrusion

Fatemi-Varzaneh¹,

Zarei-Hanzaki²,

Paul³

2016

Archives of Metallurgy and Materials

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An AZ31magneium alloy was processed through accumulative back extrusion (ABE) process at 280 °C up to six passes. Compressive deformation behavior of the processed materials was studied by employing uniaxial compression tests at room temperature. The results indicated that grains of 80 nm to 1 µm size were formed during accumulative back extrusion, where the mean grain size of the experimental material was reduced by applying successive ABE passes. A deformation texture characterizing with the basal plane mainly lie inclined to the deformation axis was developed. Compressive yield and maximum compressive strengths were measured to increase by applying successive extrusion passes, while the strain-to-fracture dropped. The evolution of mechanical properties was explained relying on the grain refinement effect as well as texture change. It was described that the share of different deformation mechanisms and developing of shearing regions near the grain boundaries may influence the deformation behavior of the ultrafine/nano grained AZ31 alloy.

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Section: Resultsmentioning

confidence: 86%

Compressive Deformation Behavior of an Ultrafine/Nano Grained AZ31 Magnesium Processed by Accumulative Back Extrusion

Fatemi-Varzaneh¹,

Zarei-Hanzaki²,

Paul³

2016

Archives of Metallurgy and Materials

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“…These features may apparently be similar to the microtwinning bands in some Mg alloys. 18,19) However, it should be noted in particular that the various rotation angles observed in Fig. 2(b) can never be explained by the primary and secondary twining of the LPSO crystals, suggesting that the micro-kinking is definitely different from the twinning event.…”

Section: ¹1mentioning

confidence: 99%

Micro-Kinking of the Long-Period Stacking/Order (LPSO) Phase in a Hot-Extruded Mg97Zn1Y2 Alloy

et al. 2013

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Microstructures of a hot-extruded Mg 97 Zn 1 Y 2 alloy containing the long-period stacking/order (LPSO) phase have been investigated by transmission electron microscopy (TEM), particularly focusing on kink-deformed LPSO crystals. It is found that kink-deformation in the LPSO phase grains are mostly characterized by singular straight interfaces across which the host crystals are sharply bended, as being similar to those reported previously. In addition to these common LPSO phase kink-bands, we occasionally find unique microscopic traces at the kinkboundaries, which are composed of multiply segmented kink-interfaces that are sequentially rotated with small angles in a same direction, accomplishing a macroscopic large crystalline bend; i.e., a micro-kinking feature. Occurrence of such micro-kinking may hardly be explained by generation of dipole-pair dislocations in the early stage of kinking, which have been successfully used for phenomenological understanding of kink deformation.

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“…3.3 Dependence of twinning on grain orientation and the condition of double twinning Similar to the case in single crystals, 2,3,[5][6][7] there is a close orientation dependence of deformation twinning on grain orientation in polycrystalline magnesium. Figure 5 Let us analyze the condition for double twinning.…”

Section: Determination Of Twin Orientation and Orientationmentioning

confidence: 99%

“…Since compression twins are very thin, dislocations for basal slip have relative short distance to operate and may easily cause pile-up at twin boundaries which leads to either tension twinning or cracks as suggested in. 5,6) …”

Section: Determination Of Twin Orientation and Orientationmentioning

confidence: 99%

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Analyses on Compression Twins in Magnesium

et al. 2008

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The orientation relationships between the compression twins and their matrices in magnesium were investigated using EBSD technique. Schmid factor analyses were applied to determine the orientation dependency of compression twins and the condition for double twinning. Results show that thin compression twin bands of f10 1 11g type lose easily their exact twin relation of 56 h11 2 20i to $40 h11 2 20i due to the instability of twin orientation and immobility of twin boundaries. And the basal orientation with TD-rotation tends to induce tension twinning in compression twins.

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Twinning deformation in magnesium compressed along the C-axis

Cited by 114 publications

References 7 publications

Compressive Deformation Behavior of an Ultrafine/Nano Grained AZ31 Magnesium Processed by Accumulative Back Extrusion

Compressive Deformation Behavior of an Ultrafine/Nano Grained AZ31 Magnesium Processed by Accumulative Back Extrusion

Micro-Kinking of the Long-Period Stacking/Order (LPSO) Phase in a Hot-Extruded Mg<sub>97</sub>Zn<sub>1</sub>Y<sub>2</sub> Alloy

Analyses on Compression Twins in Magnesium

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