Effect of initial texture on the bending behavior, microstructure and texture evolution of ZK60 magnesium alloy during the bending process

Wang, Wenke; Zhang, Wencong; Cui, Guorong; Wang, Erde

doi:10.1016/j.jallcom.2017.12.084

Cited by 42 publications

(14 citation statements)

References 33 publications

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“…The compression curve indicates that the FSWed AZ31 Mg alloy joint had lower yield strength (65.3 MPa) and higher elongation (11.7%) and the ultimate tensile strength was 252.0 MPa. For compression, the grains with c-axis parallel to WD (i.e., the c-axis is perpendicular to compression direction) were favorable for activation {1012} extension twin [24]. Researchers have reported that the extension twins in AZ31 grow quickly [17], which leads to the formation of a lower yield point.…”

Section: Bending Behavior Of Surface Test Sample and Base Test Samplementioning

confidence: 99%

The Activation and Evolution of Twinning during Bending of Friction Stir Welded AZ31 Magnesium Alloys

Qin

Zheng

2020

Metals

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AZ31 magnesium alloy joints obtained by friction stir welding with rotation speed of 1400 rpm and welding speed of 200 mm/min were subsequently subjected to the three-point bending process. The bending behavior, microstructure evolution and twinning mechanism were investigated. The results indicate that the stress-strain curve appeared as power-law shape during tension and the stress-strain curve appeared as work hardening shape during compression. However, the stress-strain curve during bending is different and macrographs of face and base bending indicated that the severe strain localization was present during bending of FSWed AZ31 magnesium alloy joint. Three concave regions formed due to texture distribution and stress state in the weld zone. In those regions, the grains had favorable orientation with c-axis parallel to the direction of tensile stress and abundant twins were activated. It can be proved by electron backscatter diffraction (EBSD) analysis—two twinning mechanisms were activated during bending—that is, ~56° { 10 1 ¯ 1 } contraction twin and ~86° { 10 1 ¯ 2 } expansion twin, in which { 10 1 ¯ 2 } twinning was main plastic deformation mechanism of joint and the number of twins was proportional to the compressive stress in corresponding areas. The twinning resulted in lattice rotation about 86° around < 1 2 ¯ 10 > direction and changed the orientation distribution of original crystal.

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Section: Bending Behavior Of Surface Test Sample and Base Test Samplementioning

confidence: 99%

The Activation and Evolution of Twinning during Bending of Friction Stir Welded AZ31 Magnesium Alloys

Qin

Zheng

2020

Metals

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“…Also, it has been shown to be a good matrix for fiber or particle reinforcement to enhance the alloy performance for both load‐bearing and functional applications . Texture evolution in the microstructure of extruded magnesium alloys is prevalent, and the effect of this texture on the deformation and mechanical behavior of ZK60A is well established in the literature . From metallurgical stand point, the development of strong texture in wrought magnesium alloys such as AZ31, AZ61, AZ80 and ZK60, and AM30 usually results in a highly irregular microstructure with distributed grain sizes.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6][7] Texture evolution in the microstructure of extruded magnesium alloys is prevalent, and the effect of this texture on the deformation and mechanical behavior of ZK60A is well established in the literature. 1,[8][9][10] From metallurgical stand point, the development of strong texture in wrought magnesium alloys such as AZ31, [11][12][13] AZ61, 14 AZ80 and ZK60, 15 and AM30 16,17 usually results in a highly irregular microstructure with distributed grain sizes. Nonetheless, grain refinement through different heat or mechanical treatment, severe plastic deformation, or surface treatments such as shot peening have been shown to enhance mechanical performance of the alloy.…”

Section: Introductionmentioning

confidence: 99%

Multiaxial fatigue of extruded ZK60 magnesium alloy

Albinmousa

Adinoyi

Merah

2019

Fatigue Fract Eng Mat Struct

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Multiaxial monotonic and cyclic behaviors of ZK60‐T5 magnesium extrusion are investigated. Strain‐controlled tests were performed at standard laboratory condition with fully reversed straining. Twinning‐detwinning deformation plays an important role in the cyclic axial behavior for tests that were performed under strain amplitudes higher than 0.4%. However, the hysteresis loop for the 0.4% was found symmetric and no sign of twinning‐detwinning deformation was observed. On the contrary, the cyclic shear behavior was found to be similar to conventional alloys and no significant asymmetric or twinning‐detwinning deformations were observed. The multiaxial fatigue tests suggest that multiaxiality and nonproportionality are not detrimental to fatigue life. Three multiaxial fatigue damage models were used: Smith‐Watson‐Topper, Fatemi‐Socie, and Jahed‐Varvani. While Fatemi‐Socie and Jahed‐Varvani models show comparable estimation, Smith‐Watson‐Topper overestimates shear and nonproportional lives.

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“…The texture effect is even more important in hexagonal metals because of the strong anisotropy of the HCP structure. The influence of the texture on the mechanical behaviors of magnesium and its alloys has been recently studied by various researchers [1][2][3][4][5][6][7][8][9][10][11][12][13]. It was shown by Gehrmann et al [1] that, during the processing of the AZ31 magnesium alloy, higher work hardening and lower ductility exhibit samples that have an initial strong fiber texture (the c-axis along the compression direction) as compared to samples with the c-axis parallel to the sheet normal or rolling direction.…”

Section: Introductionmentioning

confidence: 99%

“…It was shown by Gehrmann et al [1] that, during the processing of the AZ31 magnesium alloy, higher work hardening and lower ductility exhibit samples that have an initial strong fiber texture (the c-axis along the compression direction) as compared to samples with the c-axis parallel to the sheet normal or rolling direction. Wang et al [2] studied the effect of the initial texture on the characteristics of ZK60 subjected to the bending process. In the case of the samples prepared along the rolling direction, basal and prismatic slip were the two main deformation modes, while twinning in the (1012) system was the main deformation mode for the samples having a c-axis along the transverse direction.…”

Section: Introductionmentioning

confidence: 99%

Effect of Texture on Deformation Mode in Magnesium and Az61 Alloy

Sułkowski

2018

mafe

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The effect of the initial texture on the deformation mode and mechanical properties was studied in magnesium and its AZ61 alloy. Both materials had a very similar initial texture. Two cases were investigated: samples with a texture where the basal slip system was blocked, and samples having a texture where the basal slip system was allowed to activate. The samples were deformed by compression at room temperature at a strain rate of 10 −3 s −1 . It was found that the initial texture had a very strong impact on the deformation mode in magnesium; however, there was no effect of the initial texture on the deformation mode in the case of AZ61. The investigations were compared to simulations of texture evolution using the Taylor model. From the simulations, the Taylor factor and slip system activity were obtained. It was found that, in the case of magnesium, twinning or slip (both basal and non-basal) are the two main deformation modes, while in the case of AZ61, slip is the only main deformation mechanism despite the initial texture. The impact of the initial texture is discussed in more detail in the present study. StreszczenieW pracy badano wpływ początkowej tekstury na mechanizmy deformacji i właściwości mechaniczne magnezu i stopu magnezu AZ61. Zbadano dwa przypadki: próbki, w których bazalny system poślizgu został zablokowany, oraz próbki, w których bazalny system poślizgu mógł być aktywowany. Próbki odkształcano przez ściskanie w temperaturze pokojowej z prędkością odkształcania 10 -3 s -1 . Stwierdzono, że początkowa tekstura miała bardzo silny wpływ na sposób deformacji magnezu; jednak w przypadku AZ61 nie zauważono podobnego efektu wpływu początkowej tekstury na właściwości mechaniczne. Badania porównano z symulacjami ewolucji tekstury za pomocą modelu Taylora. Z symulacji uzyskano współczynnik Taylora i aktywności systemów poślizgu. Stwierdzono, że w przypadku magnezu, w zależności od początkowej tekstury, poślizg (zarówno w bazalnym systemie, jak i niebazalnych systemach poślizgu) oraz bliźniakowanie są dwoma głównymi mechanizmami deformacji, natomiast w przypadku AZ61 głównym mechanizmem deformacji, pomimo początkowej tekstury, jest tylko poślizg.

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Effect of initial texture on the bending behavior, microstructure and texture evolution of ZK60 magnesium alloy during the bending process

Cited by 42 publications

References 33 publications

The Activation and Evolution of Twinning during Bending of Friction Stir Welded AZ31 Magnesium Alloys

The Activation and Evolution of Twinning during Bending of Friction Stir Welded AZ31 Magnesium Alloys

Multiaxial fatigue of extruded ZK60 magnesium alloy

Effect of Texture on Deformation Mode in Magnesium and Az61 Alloy

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