Reverse tension/compression asymmetry of a Mg–Y–Zn alloys containing LPSO phases

Garcés, G.; Pérez, P.; Cabeza, Sandra; Lin, Huayi; Kim, S.; Gan, Weimin; Adeva, P.

doi:10.1016/j.msea.2015.09.003

Cited by 86 publications

(30 citation statements)

References 32 publications

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“…[1,3,16] It was reported in some papers that the unrecrystallized grains with their basal planes parallel to ED contribute dominantly to the initial texture. [15,19] This idea is consistent with our results, where the reduction in the volume fraction of the unrecrystallized grains results in texture weakening. The S-shaped deformation curve observed in both WZ21 and WZ42 alloys is the result of the high twinning activity.…”

Section: Discussionsupporting

confidence: 92%

“…Garc es et al presented similar results for extruded Mg-Y-Zn alloys containing LPSO phase extruded at 350 C with a reduction ratio of 18:1. [19] It was reported by Bohlen et al that bimodal microstructure, consisting of grains elongated along ED, and small recrystallized grains is formed in Mg alloys when low extrusion speed is applied. [1] Data in Table 1 clearly show the influence of the concentration of alloying elements on microstructure.…”

Section: Discussionmentioning

confidence: 96%

“…The presence of the LPSO phase may inhibit or delay twinning activity due to a high density of stacking faults enriched with Zn/Y in the basal planes. [19,[24][25][26] Therefore, the true stress-true strain curve for WZ72 alloy still has a concave part, but the inflection point is shifted toward higher strain level, and the strain hardening is less pronounced by comparison with the WZ21 and WZ42 alloys. The convex shape of the WZ104 alloy is the result of low twinning activity and activation of slip systems.…”

Section: Discussionmentioning

confidence: 98%

“…[3] It was reported that the initial stage of plastic deformation of Mg alloys containing LPSO phase is controlled mainly by basal slip and twinning in the unrecrystallized grains. [16,19] The local minimum in the AE count rate beyond the yield point observed in the WZ21 alloy, contrary to WZ42 alloy, could be related to the difference in twinning activity. Unlike twin nucleation, the thickening of the twins is a relatively slow process and does not emit detectable AE signal.…”

Section: Discussionmentioning

confidence: 99%

“…Table 1. Volume fraction of LPSO, coarse (unrecrystallized) and recrystallized grains [19] and grain size of recrystallized grains. Figure 3.…”

Section: Discussionmentioning

confidence: 99%

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Characterization of Microstructure and Mechanical Properties of Mg–Y–Zn Alloys with Respect to Different Content of LPSO Phase

et al. 2017

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The Mg-Y-Zn alloys with different contents of alloying elements are extruded at an extrusion ratio of 4:1 at 350 C. The microstructure of the alloys is of an inhomogeneous character showing fine grains produced due to dynamic recrystallization and coarse original grains elongated along the extrusion direction (ED). Moreover, Y and Zn form a long-period stacking-ordered (LPSO) phase whose volume fraction increases with their increasing content in the alloy. All investigated alloys exhibit distinct fiber textures with basal planes oriented parallel to ED. It is seen that increasing content of alloying elements leads to a weaker texture. Compression tests with concurrent acoustic emission (AE) measurements are performed along ED at room temperature and a constant strain rate in order to reveal active deformation mechanisms in the alloys and to relate them to their mechanical properties. The AE response is also discussed with respect to the volume fraction of the LPSO phase.

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