Evolution of microstructure and microtexture in fcc metals during high-pressure torsion
MetadataShow full item record
Pure nickel and commercially pure (CP) aluminium were selected as model fcc materials for a detailed investigation of the experimental parameters influencing grain refinement and evolution of micro- structure and microtexture during processing by high- pressure torsion (HPT). Samples were examined after HPT using microhardness measurements, transmission electron microscopy and orientation imaging micros- copy. Processing by HPT produces a grain size of ~170 nm in pure Ni and ~1 lm in CP aluminium. It is shown that homogeneous and equiaxed microstructures can be attained throughout the samples of nickel when using applied pressures of at least ~6 GPa after 5 whole revolution. In CP aluminium, a homogeneous and equiaxed microstructure was achieved after 2 whole revolutions under an applied pressure of 1 GPa. For these conditions, the distributions of grain boundary misorientations are similar in the centre and at the periphery of the samples. It is shown that simple shear texture develops in fcc metals subjected to high-pressure torsion. Some grain growth was detected at the periphery of the Al disk after 8 revolutions. The factors influencing the development of homogeneous microstructures in processing by HPT are discussed.
The article of record as published may be found at http://dx.doi.org/10.1007/s10853-006-0628-0
Showing items related by title, author, creator and subject.
The effect of mixing methods on the dispersion of carbon nanotubes during the solvent-free processing of multiwalled carbon nanotube/epoxy composites Gupta, Murari L.; Sydlik, Stefanie A.; Schnorr, Jan M.; Woo, Dong Jin; Osswald, Sebastian; Swager, Timothy M.; Raghavan, Dharmaraj (Wiley periodicals, 2013);Several solvent-free processing methods to disperse multiwalled carbon nanotubes (MWCNTs) in bisphenol F-based epoxy resin were investigated, including the use of a microfluidizer (MF), planetary shear mixer (PSM), ...
Microstructural effects of multiple passes during friction stir processing of nickel aluminum bronze Nelson, Elizabeth A. (Monterey, California. Naval Postgraduate School, 2009-12);Friction Stir Processing (FSP) is an emerging technology based on Friction Stir Welding that allows the near surface regions of a material to be selectively processed to improve the material properties. Single and multiple ...
A microtexture investigation of recrystallization during friction stir processing of as-cast NiAl bronze Oh-Ishi, Keiichiro; Zhilyaev, Alexander P.; McNelley, Terry R. (Elsevier, 2006-07);As-cast NiAl bronze (NAB) was subjected to friction stir processing (FSP). Orientation imaging microscopy (OIM) methods were used to obtain microtexture data in the stir zone (SZ) and along its periphery. At selected ...