Twinning and texture development in two Mg alloys subjected to loading along three different strain paths

Jiang, Lan; Jonas, John J.; Mishra, Raja K.; Luo, Alan A.; Sachdev, Anil K.; Godet, Stéphane

doi:10.1016/j.actamat.2007.03.006

Cited by 419 publications

(163 citation statements)

References 24 publications

Supporting

Mentioning

153

Contrasting

Order By: Relevance

“…Here the grains oriented in the band around the TD-ND plane are all oriented well for extension twinning which results in a rotation of 86 deg to orientations near the CD direction, which is again consistent with the experimental measurements in Figures 8(e) and (f) and also with the results of Jiang et al [16] The one difference that can be observed between these two conditions is that the amount of twinning activity for grains oriented near the TD direction is lower in the case of a biaxiality ratio of À0.5. This is reflected in both the experimental and VPSC pole figures where the intensity at the center of the pole figure is higher than for uniaxial compression.…”

Section: B Texture Evolutionsupporting

confidence: 82%

“…[15] A number of studies have examined strain paths other than uniaxial tension or compression, e.g., ring hoop tension [16] or simple shear. [17] The forming of magnesium has been examined using forming limit diagrams [18][19][20] and through simplified forming tests such as deep drawing [21] and bending [22] (including spring back [23,24] ).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Biaxial Deformation of the Magnesium Alloy AZ80

Tomlinson

Azizi-Alizamini

Poole

et al. 2013

Metall Mater Trans A

View full text Add to dashboard Cite

The multiaxial deformation of magnesium alloys is important for developing reliable, robust models for both the forming of components and also analysis of in-service performance of structures, for example, in the case of crash worthiness. The current study presents a combination of unique biaxial experimental tests and biaxial crystal plasticity simulations using a visco-plastic self-consistent (VPSC) formulation conducted on a relatively weak AZ80 cast texture. The experiments were conducted on tubular samples which are loaded in axial tension or compression along the tube and with internal pressure to generate hoop stresses orthogonal to the axial direction. The results were analyzed in stress and strain space and also in terms of the evolution of crystallographic texture. In general, it was found that the VPSC simulations matched well with the experiments. However, some differences were observed for cases where basal hai slip and 10 " 12 È É extension twinning were in close competition such as in the biaxial tension quadrant of the plastic potential. The evolution of texture measured experimentally and predicted from the VPSC simulations was qualitatively in good agreement. Finally, experiments and VPSC simulations were conducted on a second AZ80 material which had a stronger initial texture and a higher level of mechanical anisotropy. In the previous case, the agreement between experiments and simulations was good, but a larger difference was observed in the biaxial tension quadrant of the plastic potential.

show abstract

Section: B Texture Evolutionsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Biaxial Deformation of the Magnesium Alloy AZ80

Tomlinson

Azizi-Alizamini

Poole

et al. 2013

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…The texture consists of the grains whose basal planes in HCP crystal structure are approximately parallel to the extruded direction. 5,10,11) It is expected that the extruded AZ31B alloys used in this study also have the similar texture, and that the fatigue crack would propagate perpendicular to the basal plane. The notch whose plane and direction are parallel to (10 1 10) and [0001] was introduced into the Mg single crystal, and the fatigue crack propagation behaviors have been reported by Ando et al 12,13) As a result, striation-like-patterns were observed on the fracture surface.…”

Section: )mentioning

confidence: 99%

Relationship between Fatigue Strength and Grain Size in AZ31 Magnesium Alloys

et al. 2008

View full text Add to dashboard Cite

The effects of the grain size on the fatigue fracture behaviors in extruded AZ31B alloys were investigated. The mean grain sizes are 4.7 mm in F-specimen, 15 mm in M-specimen and 23 mm in C-specimen, respectively. The fatigue tests with R ¼ À1 were carried out with a plane fatigue bending machine, which was originally developed for thin sheet specimen. S-N curves show that the fatigue limit of the F-, the M-and the C-specimens were estimated as 160 MPa, 150 MPa and 150 MPa, respectively. The F-specimen had the highest fatigue limit in the present alloys. On the other hand, the fatigue life in low cycle region of the F-specimen is shorter than those of the M-and C-specimens. Striation-likepatterns were observed on the fracture surfaces in all of the specimens, although the grain sizes were different. Twin was not observed in the Fspecimen, but it was near the crack in the C-specimen. Consequently, twinning under the fatigue test depends on the grain size, and it affects the fatigue life of AZ31B alloys.

show abstract

“…in the form of inverse pole figures. The volume fractions of the two components were similar in the AM30 (48 % for the TD and 39 % for the RD), while the AZ31 had a stronger TD component (65 %) compared to the RD (15 %) (Jiang et al, 2007). A fibre texture links the two components by continuous rotations around Φ of ± 90° and φ 2 of ± 30° starting from the TD orientation (0,0,30) and ending at the RD orientation (0,90,0) (following the Bunge notation (Bunge, 1982)).…”

Section: Initial Materialsmentioning

confidence: 91%

“…Magnesium Alloys -Design, Processing and Properties 24 thicken rather than generating further strain localizations (Jiang et al, 2007). Therefore, such twins are not very effective sites for the initiation of recrystallization.…”

Section: Recrystallization Of Twinsmentioning

confidence: 99%