Structural and mechanical properties of nanocrystalleve titanium processed by severe plastic deformation

Microstructural evolution in commercial purity aluminum during high-pressure torsion

“…For example, there are reports of the production of reasonably homogeneous microstructures in an aluminum-based alloy [5], pure copper [6] and pure nickel [7], as well as in titanium [8] and nickel-aluminide [9]. In a detailed investigation of pure nickel [7,10], it was shown that microstructural evolution begins at the outer edges of the disks used in HPT and the evolution spreads gradually to the centers of the disks with increasing imposed strain.…”

The influence of surface roughness and high pressure torsion on the growth of anodic titania nanotubes on pure titanium

“…(It should be noted that grain sizes measured from dark field images can slightly underestimate the grain size due to distorted layers at the periphery of each grain [5].) The HPT processed Ti has large grain boundary misorientations [38], Most SPD-processed materials demonstrate enhanced hardness and strength at room temperature [39]. For conventional polycrystalline metals, the relationship between the strength as well as the hardness and the mean grain size can often be described by a HallPetch relationship [40]:…”

Nanocrystalline Ti Produced by Cryomilling and Consolidation by Severe Plastic Deformation

“…For the past decade or so, the interest in the application of severe plastic deformation (SPD) techniques to manufacture nanostructured Ti has been motivated by several factors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. First, the reports on the formation of an ultrafine-grained structure from SPD processing and its influence on the mechanical behavior have led to interesting fundamental questions [1][2][3][4][5][6][7][8][9][10][11][12][13].…”

“…First, the reports on the formation of an ultrafine-grained structure from SPD processing and its influence on the mechanical behavior have led to interesting fundamental questions [1][2][3][4][5][6][7][8][9][10][11][12][13]. Second, the published studies suggest that nanostructuring of Ti and its alloys can result in significant enhancements in strength, ductility and fatigue life [10,14], which provide a pathway to the structural and medical applications.…”

“…Grain refinement in commercially pure Ti by various SPD methods typically leads to ultrafine grain (UFG) structures with an average grain size in the range of 100-600 nm [3][4][5][6][12][13][14][15]. However, it has been reported that the consolidation of the metal powders via SPD methods can be implemented to prepare high-density samples with grain sizes that are smaller than 50 nm [16,17].…”