Impact of solute elements on detwinning in magnesium and its alloys

Cui, Yujie; Li, Yunping; Wang, Zhongchang; Ding, Xu; Koizumi, Yuichiro; Bian, Huakang; Lin, Liyang; Chiba, Akihiko

doi:10.1016/j.ijplas.2016.09.014

Cited by 92 publications

(34 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On reversal of the strain paths, the twins formed during pre-straining tend to detwin as lower stresses are required for detwinning as compared to twin propagation. Similar works [18,19] have shown that detwinning via atomic shuffling occurs as a consequence of strain path changes.…”

mentioning

confidence: 54%

“…The findings discussed above lay an important insight for quantifying the influence of deformation rate on stress-triaxiality. Previously detwinning in the literature has been strongly credited to pure atomic shuffling [17][18][19]. Proust et al [17], have shown that detwinning occurs in the case of specimens subjected to strain path changes along the rolling direction (RD) or extruded direction (ED).…”

mentioning

confidence: 99%

See 1 more Smart Citation

On the roles of stress-triaxiality and strain-rate on the deformation behavior of AZ31 magnesium alloys

Kale

Rajagopalan

Turnage

et al. 2017

Materials Research Letters

View full text Add to dashboard Cite

The presence of complex states-of-stress and strain-rates directly influence the dominant deformation mechanisms operating in a given material under load. Mg alloys have shown limited ambient temperature formability due to the paucity of active slip-mechanisms, however, studies have focused on quasi-static strain-rates and/or simple loading conditions (primarily uniaxial or biaxial). For the first time, the influence of strain-rate and stress-triaxiality is utilized to unravel the active deformation mechanisms operating along the rolling, transverse-and normal-directions in wrought AZ31-alloy. It is discovered that the activation of various twin-mechanisms in the presence of multiaxial loading is governed by the energetics of the applied strain-rates. IMPACT STATEMENTIt is shown for the first time that the higher deformation energy associated with dynamic strain-rates, coupled with high-triaxiality, promotes detwinning and texture evolution in HCP alloys with high c/a ratio. ARTICLE HISTORY

show abstract

mentioning

confidence: 54%

mentioning

confidence: 99%

On the roles of stress-triaxiality and strain-rate on the deformation behavior of AZ31 magnesium alloys

Kale

Rajagopalan

Turnage

et al. 2017

Materials Research Letters

View full text Add to dashboard Cite

show abstract

“…This is different from the motion of twin boundaries (TBs) as a result of glide of twinning dislocations along the TBs. [32] Poor formability of Mg alloys is closely associated with the facts that basal slip, as the easiest slip system, can neither provide five independent slip systems nor accommodate deformation along c-axis for achieving homogeneous plastic deformation in polycrystalline materials. [4] Therefore, it is very important to activate other deformation modes, such as twinning and hc þ ai slip for improvement the ductility of Mg alloys.…”

Section: Resultsmentioning

confidence: 99%

Sliding and Migration of Tilt Grain Boundaries in a Mg–Zn–Y Alloy

Yang

2017

Adv Eng Mater

View full text Add to dashboard Cite

Sliding and migration of tilt grain boundaries in a Mg-Zn-Y alloy have been investigated on the atomic scale using aberration-corrected scanning transmission electron microscopy. Grain boundary sliding is accommodated by non-basal dislocations moving along the grain boundary; grain boundary migration is induced by the motion of grain boundary dislocations with synchronized grain boundary diffusion. Simultaneous sliding and migration of tilt boundaries take place in both Mg matrix and long period stacking ordered phases. These results provide evidence for occurrence of grain boundary motion, which may play a role in plasticity of this kind of Mg alloys.

show abstract

“…Robson et al [34] and Fan et al [35] reported that the prismatic plate precipitates in Mg-RE alloys are effective obstacles against twin growth to reduce mechanical asymmetry, but on the contrary, it has been shown that the threshold for twinning activation in Mg-RE alloy after aging may be softened [11]. In the latter case, one possible reason is that solution depletion after aging may counterweight the strengthening effect of precipitates on twinning [12,36].…”

Section: Introductionmentioning

confidence: 99%

On the interaction of precipitates and tensile twins in magnesium alloys

et al. 2019

View full text Add to dashboard Cite

Although magnesium alloys deform extensively through shear strains and crystallographic re-orientations associated with the growth of twins, little is known about the strengthening mechanisms associated with this deformation mode. A crystal plasticity based phase field model for twinning is employed in this work to study the strengthening mechanisms resulting from the interaction between twin growth and precipitates. The full-field simulations reveal in great detail the pinning and de-pinning of a twin boundary at individual precipitates, resulting in a maximum resistance to twin growth when the precipitate is partially embedded in the twin. Furthermore, statistically representative precipitate distributions are used to systematically investigate the influence of key microstructural parameters such as precipitate orientation, volume fraction, size, and aspect ratio on the resistance to twin growth. The results indicate that the effective critical resolved shear stress (CRSS) for twin growth increases linearly with precipitate volume fraction and aspect ratio. For a constant volume fraction of precipitates, reduction of the precipitate size below a critical level produces a strong increase in the CRSS due to the Orowan-like strengthening mechanism between the twin interface and precipitates. Above this level the CRSS is size independent. The results are quantitatively and qualitatively comparable with experimental measurements and predictions of mean-field strengthening models. Based on the results, guidelines for the design of high strength magnesium alloys are discussed.

show abstract

Impact of solute elements on detwinning in magnesium and its alloys

Cited by 92 publications

References 82 publications

On the roles of stress-triaxiality and strain-rate on the deformation behavior of AZ31 magnesium alloys

On the roles of stress-triaxiality and strain-rate on the deformation behavior of AZ31 magnesium alloys

Sliding and Migration of Tilt Grain Boundaries in a Mg–Zn–Y Alloy

On the interaction of precipitates and tensile twins in magnesium alloys

Contact Info

Product

Resources

About