Operation of solute-drag creep in an AlCoCrFeMnNi high-entropy alloy and enhanced hot workability

Tensile creep behavior of HfNbTaTiZr refractory high entropy alloy at elevated temperatures

“…Furthermore, subgrain boundaries were observed near bulging grain boundaries due to polygonization, Fig. 5 (c, f, i, l), this phenomena was observed in other metals deformed in the solute drag regime [65,66]. Despite significant deformation of grain boundaries after creep, there was no crack or void observed at the intergranular regions.…”

A Short Review on Superplasticity of Aluminum Alloys

“…GBS controls region II superplastic deformation (SD) where the stress exponent (n) is 2 [1]. GBS usually leads to extensive superplasticity (>400%) and its activation strongly depends on a fine grain size (< 10 μm) and high strain rate sensitivity (m-value > 3) [14][15][16]. As the grains become finer, the stain rate sensitivity value (m-value) increases [29].…”

“…SDC occurs through the gliding of dislocations at elevated temperatures, and it can yield tensile elongation between 100 and 400% [16]. The activation of SDC is independent of grain size [16][17][18], and as such, it can occur in coarse-grained alloys.…”

“…SDC occurs through the gliding of dislocations at elevated temperatures, and it can yield tensile elongation between 100 and 400% [16]. The activation of SDC is independent of grain size [16][17][18], and as such, it can occur in coarse-grained alloys. SDC is the mechanism that controls region III superplastic deformation (stress exponent > 3) where the strain rate is high, and the strain rate sensitivity is low (<3) [1].…”

“…SDC is the mechanism that controls region III superplastic deformation (stress exponent > 3) where the strain rate is high, and the strain rate sensitivity is low (<3) [1]. Typically, SDC-controlled deformation leads to the formation of subgrains, which results from the arrangement of dislocations into a low-energy configuration [1,16]. DC involves diffusional material transport along grains boundaries (or within grains) at an elevated temperature, as shown in Figure 3.…”