Details

Autor(en) / Beteiligte

• Zhilyaev, A.P
• Nurislamova, G.V
• Kim, B.-K
• Baró, M.D
• Szpunar, J.A
• Langdon, T.G

Titel

Experimental parameters influencing grain refinement and microstructural evolution during high-pressure torsion

Ist Teil von

• Acta materialia, 2003-02, Vol.51 (3), p.753-765

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2003

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Pure nickel was selected for a detailed investigation of the experimental parameters influencing grain refinement and microstructural evolution during processing by high-pressure torsion (HPT). Samples were examined after HPT using microhardness measurements, transmission electron microscopy and orientation imaging microscopy. Processing by HPT produces a grain size of ~170 nm in pure Ni, and homogeneous and equiaxed microstructures are attained throughout the samples when they are subjected to at least ~5 whole revolutions under applied pressures of at least ~6 GPa. For these conditions, the distributions of grain boundary misorientations are similar in the center and at the periphery of the samples. A simple model is proposed to explain the development of a homogeneous microstructure in HPT.