Texture and mechanical properties of superplastically deformed magnesium alloy rod

Watanabe, Hiroyuki; Fukusumi, Masao; Somekawa, Hidetoshi; Mukai, Toshiji

doi:10.1016/j.msea.2010.06.053

Cited by 24 publications

(13 citation statements)

References 34 publications

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“…Despite the absence of denuded zones, the mechanism of denuded zone formation during slipaccommodated grain-boundary sliding can be used to interpret the asymmetric flow observed in the present study. First, the dominant deformation mechanism of the PM Mg-Zn-Zr alloy and the AZ91 alloy in the superplastic regime has been suggested to be slip-accommodated grain-boundary sliding ( Ref 11,13,19). Second, a characteristic feature of the microstructure of the present AZ91 alloy during superplastic deformation was coarsening of intergranular precipitates, which agrees with the RWS model.…”

Section: Strain Hardeningsupporting

confidence: 79%

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Tension-Compression Asymmetry Under Superplastic Flow in Magnesium Alloys

Watanabe

Fukusumi

2014

J. of Materi Eng and Perform

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Superplastic magnesium alloys prepared by ingot metallurgy and powder metallurgy were processed and characterized. By performing uniaxial tension and compression tests of the extruded alloys along the longitudinal direction, it was found that both alloys were highly symmetric at low-strain rates within the superplastic regime. However, near the maximum strain rate within the superplastic regime, the symmetric flow disappeared. Specifically, the flow stress in early deformation under tension was slightly lower than that under compression, and the strain hardening under tension was higher than that under compression. The asymmetry was explained using the hypothesis that grain-boundary sliding under tension is easier than under compression. As indirect evidence for easier grain-boundary sliding under tension, it was shown that the coarsened intergranular precipitates tended to agglomerate on grain boundaries experiencing a tensile stress.

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Section: Strain Hardeningsupporting

confidence: 79%

“…TEM microstructure of the IM AZ91 alloy annealed at 523 K has been reported in Ref 13. The superplastic properties of this alloy produced by ingot metallurgy (IM) have been reported previously (Ref 11,13). In the present study, some additional compression tests were performed on the AZ91 alloy to understand the tension-compression asymmetry.…”

Section: Methodsmentioning

confidence: 58%

Tension-Compression Asymmetry Under Superplastic Flow in Magnesium Alloys

Watanabe

Fukusumi

2014

J. of Materi Eng and Perform

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“…Watanabe et al [37] observed that the speed of texture weakening of the extruded AZ91 alloy in a sheet form was higher than that in a rod form. Therefore, although the initial texture was different in the cast, ECAP, and rolled AM60 alloy in [14], the texture weakening speed might also be different in these samples, hence the same flow stress was observed.…”

Section: Discussionmentioning

confidence: 99%

Influence of texture on superplastic behavior of friction stir processed ZK60 magnesium alloy

Yang

Feng

Xiao

et al. 2012

Materials Science and Engineering: A

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“…The grain size of the alloy in the form of an extruded rod was $4 mm. The texture analysis of the extruded alloy after annealing at 548 K for 1.8 ks showed that most of the basal planes lie parallel to the extrusion axis [9], as schematically illustrated in Fig. 1a.…”

Section: Methodsmentioning

confidence: 96%