Achieving high superplasticity of a traditional thermal–mechanical processed non-superplastic Al–Zn–Mg alloy sheet by low Sc additions

An examination of the superplastic characteristics of Al–Mg–Sc alloys after processing

“…(1), the temperature and grain size compensated strain rate was plotted against the normalized stress as shown in Fig. 4 for results obtained without processing by SPD as listed in Table 1 [32][33][34][35][36][37][39][40][41][42][43][44][45][46][47][48], in Fig. 5 for results obtained after ECAP as listed in First, all of the results are mutually consistent.…”

“…First, it is important to recognize that there are numerous reports of superplasticity in Al-Mg-Sc alloys even without processing using SPD procedures. These results are summarized in Table 1 [32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] and they cover various metal-working procedures based primarily on cold-or hot-rolling. Typically, the grain sizes in these materials are in the conventional superplastic range of ~1 -10 µm.…”

A Review on Superplastic Formation Behavior of Al Alloys

“…Meanwhile, Johannes and Mishra [113] concluded that fiber (whisker) formation (Figure 3) was the evidence of the existence of liquid phases along grain boundaries. Furthermore, Duan et al [56] thought the existence of fiber as an indirect evidence for GBS.…”

Achieving high strain rate superplasticity of an Al-Mg-Sc-Zr alloy by a new asymmetrical rolling technology

“…Superplastic deformation is a thermal activated process. To further elucidate the superplastic deformation mechanism, the following equation is used to perform the calculation of activation energy (Q) [29]   n Q 1/…”