Superplastic dual-phase nanostructure Mg alloy: A molecular dynamics study

Balancing strength and plasticity of dual-phase amorphous/crystalline nanostructured Mg alloys*

“…Previous study has shown that for the Mg 50 Al 50 DPMA model, when the AB spacing is 5.0 nm, the plasticity of the sample is excellent. [29] Here, for comparison, the values of τ y and ρ of the Mg 50 Al 50 DPMA models in the previous study are also given in Fig. 3(b).…”

“…Previous studies have systematically investigated the mechanical behavior of the DMPA with Mg 50 Al 50 amorphous phase. [26,29] The results show that the improvement of the plasticity of DMPA is at the expense of the strength of the alloys. Therefore, it is considered whether the sacrifice of the strength of DMPA can be reduced by changing the microstructure of amorphous phase while maintaining excellent plasticity, thus obtaining the DMPA with high strength and superior plasticity.…”

“…3(a). [29] When the AB spacing is 5.0 nm, the peak stress of the Mg 50 Al 50 DPMA model is 1.34 GPa and that of the Mg 20 Al 80 DPMA model can achieve 1.57 GPa. That is to say, when the amorphous phase of Mg 20 Al 80 is used instead of the amorphous phase of Mg 50 Al 50 in the DPMA, the strength of alloys increases by 17.2%.…”

“…Additionally, it has been confirmed that for the first DPMA model, when the AB spacing 066201-3 reaches 5.0 nm, the sample exhibits superior plasticity. [26,29] For comparison, the stress-strain curve of the first DPMA model with the amorphous phase of Mg 50 Al 50 is also given in Fig. 3(a).…”

“…[27] Therefore, we also studied the effect of amorphous boundary (AB) spacing on the plastic deformation mechanism of the DPMA. [28,29] The optimal matching relationship between the size of amorphous phase and that of crystalline phase is obtained. However, the relationship between the strength and plasticity of DPMA still needs further studying.…”