Deformation mechanisms and dynamic recrystallization of AZ31 Mg alloy with different initial textures during hot tension

Effects of texture and grain size on mechanical properties of AZ80 magnesium alloys at lower temperatures

“…First, although expected dislocation density induced by ECAP process is remarkably high, the residual dislocation density decreases more sharply at warm testing conditions, implying that the effect of dislocation strengthening in AZ80 alloy after ECAP becomes less notable [23]. Secondly, at the temperature level of 373 K, texture is believed to play a more important role on the mechanical properties of Mg alloys [24,25]. As shown in Fig.…”

Anisotropy of the Mechanical Properties of Twin-roll Cast, Rolled and Heat-treated AZ31 as a Function of Temperature and Strain rate

“…A theoretical connection of the texture (evolution) with the material behaviour was interpreted from [5,9,10,19,24,[38][39][40][41]. The yield strength is a function of the initial texture [24].…”

“…A tilt of the unit cell allowed the deformation in the sheet thickness direction (ND), as the Burgers vector of the basal slip was aligned in the normal direction [9]. An enhancement of the dislocation motion in the 0° deformation direction compared to the 90° direction led to dynamic recovery followed by increased dynamic recrystallization [39]. This became apparent through lower strain hardening in the flow curves [40].…”

Effect of extension 101-2 twins on texture evolution at elevated temperature deformation accompanied by dynamic recrystallization

“…For the various crystal plasticity models the obtained CRSS values have a broad spread (Lou et al (2007)), for example, in the work by Barnett (2003), the ratio of CRSS values for intermediate hot working temperatures is suggested to be τ basal : τ prismatic : τ c+a : τ twinning ∼ 1 : 6 : 5 : 6. It is accepted in literature that the CRSS value for deformation twinning is assumed to be temperature insensitive (Barnett (2003); Li et al (2013b)), therefore, in the current simulations, the CRSS is kept the same for all the temperatures. The CRSS values for the slip systems were varied to get the best match to the experimental data and are shown in fig.…”

“…A sign of active deformation twinning in the flow curves (plateau-type behaviour and rapid hardening) was present during the channel die compression of pure Mg and AZ31 alloy at 200°C and 300°C and the strain rate 10 −4 s −1 (Gottstein and Al-Samman (2005); Gehrmann et al (2005)). Li et al (2013b) presented experimental analysis that showed the relationship between twinning and DRX. They showed that the <c+a> slip enhanced the DRX when twinning is active.…”