Investigation of precipitate hardening of slip and twinning in Mg5%Zn by micropillar compression

Interactions between basal dislocations and β1′ precipitates in Mg–4Zn alloy: Mechanisms and strengthening

“…The average length and diameter of the precipitates in the material aged at 149 °C for 100 h were 146 ± 10 nm and 9.7 ± 2 nm, respectively. These results are very close to those reported by Wang and Stanford[24] in a Mg-5 wt.% Zn subjected to similar aging conditions. Coarser precipitates were found in the alloy aged at 204 °C for 24 h, with average length and diameters of 235 ± 10 nm and 15.0 ± 2 nm, respectively.…”

“…Although the mechanical properties of the Mg-Zn alloy are well-established [36], the CRSS for basal dislocations in this system has only been studied in [24,37]. Chung and Byrne [37] measured the CRSS in Mg-5.…”

Effect of Al content on the critical resolved shear stress for twin nucleation and growth in Mg alloys

“…These limitations can be overcome through the application of micromechanical testing techniques. In fact, micropillar compression tests have been extensively used to analyse the different deformation mechanisms of Mg and Mg alloys along specific orientations [17,21,26,[28][29][30][31][32][33][34][35], overcoming the limitations of tests in polycrystals. For instance, micropillar compression tests were performed in pure Mg along the a-axis [17,26,28,30,31,35] to explore the effect of the micropillar size on the mechanisms of {1012} twin deformation and on the CRSS for twin growth.…”

Effect of precipitate shape and orientation on Orowan strengthening of non-basal slip modes in hexagonal crystals, application to magnesium alloys

“…It is therefore of interest to study the strengthening effect of precipitates on the non-basal 〈 + 〉 c a slip systems. The 〈 + 〉 c a slip system was reported to be strengthened only modestly by the prismatic plates in a WE43 alloy via in-situ neutron diffraction and plasticity modeling [11], and weakly affected by c-axis rods in Mg-5%Zn single crystals examined via micropillar compression tests [7]. A quantitative evaluation is needed in order to predict and compare the relative strengthening effects of differently shaped precipitates.…”

“…In common precipitation hardenable Mg alloys, the precipitate types and morphologies have been studied extensively by experimental methods, including the quantitative characterization of size and distribution [6][7][8]. The theoretical evaluations of the strengthening effects of precipitates on basal and prismatic slip systems were developed by Nie [9] and Robson [10], respectively, based on the Orowan mechanism.…”