Mechanical properties and structural stability of a bulk nanostructured metastable aluminum-magnesium system

An examination of microstructural evolution in a Pb–Sn eutectic alloy processed by high-pressure torsion and subsequent self-annealing

“…It should be noted that the Pbrich phase remains as an FCC structure and the Sn precipitates remain as a BCT structure in large number of defects including dislocations and vacancies [1] and all of these defects favour the dissolution of precipitates [54][55][56]. Furthermore, it was shown earlier that it is possible to produce extreme supersaturation through HPT as demonstrated in the processing of a metastable Al-Mg system [57,58]. Atomic motility may be significantly promoted by HPT through grain boundary diffusion since the population of grain boundaries is high because the grain size is significantly refined by HPT [59] and a high dislocation density may also promote solubility through pipe diffusion and solute drag [60].…”

Evaluating the paradox of strength and ductility in ultrafine-grained oxygen-free copper processed by ECAP at room temperature

“…There is an apparent difference in the values of m between these two investigations but this difference should be investigated by conducting additional detailed experiments using strain rate jump testing. Nevertheless, it is important to note that recent experiments on the Al-Mg system using HPT processing showed that the value of m increases over at least the range from 20 to 100 turns [82] and therefore a reasonably high value of m may be anticipated after processing by ECAP to a high strain.…”

Texture evolution in high-pressure torsion processing

“…Several modified HPT processing methods were proposed over the last decade such as highpressure tube twisting (HPTT) [34], tube high-pressure shearing (t-HPS) [35,36], highpressure-double-torsion (HPDT) [34], high-pressure sliding (HPS) [37], reversal high pressure torsion (RHPT) [38] and high pressure compressive shearing (HPCS) [39] in order to provide solutions to the limitations of HPT processing such as the inhomogeneity of the shear strain across the disc radius or the smallness of the sample [40]. Recently, it was demonstrated that HPT processing is an excellent tool for the consolidation of metal powders [41][42][43] and for fabricating hybrid systems in order to ultimately obtain metal matrix nanocomposites (MMNCs) such as Al-Mg [44][45][46], Al-Cu [47] and Zn-Mg [48].…”