Thermal Stability of Nanocrystalline Ni

• Authors: A. Korznikov , Z. Pakieła , K. Kurzydłowski
• Languages of publication: EN

Abstracts

EN

Ultrafine-grained structure with grain size of about 100 nm was obtained in nickel by deformation under a pressure of 7 GPa in Bridgman anvils. The structure evolution in ultrafine-grained nickel was studied by residual resistance, transmission electron microscopy, X-ray diffraction, and microhardness measurements. It was established that the evolution of the structure upon heating of ultrafine-grained nickel may be divided into three stages. Stage A corresponds to temperatures below 453 K and is characterised by an insignificant decrease in the resistivity and microhardness. At this stage, a decrease in the internal stresses is not accompanied by grain growth. Stage B, corresponding to the temperatures range of 453-513 K, is characterised by an abrupt decrease in the resistivity and hardness, disappearance of the internal stresses, and by an intense grain growth. Stage C (above 523 K) corresponds to an insignificant increase in the resistivity and further decrease in the hardness.

Keywords

EN

62.25.+g; 73.63.Bd

Discipline

• 73.63.Bd: Nanocrystalline materials

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2002
• Volume: 102
• Issue: 2
• Pages: 265-271

Dates

published

2002-08

received

2001-09-23

Contributors

author

A. Korznikov

• Institute of Problems of Metal Superplasticity, Russian Academy of Sciences, Khalturina 39, Ufa, 450001 Bashkortostan, Russia

author

Z. Pakieła

• Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland

author

K. Kurzydłowski

• Faculty of Materials Science and Engineering, Warsaw University of Technology, Wołoska 141, 02-507 Warsaw, Poland

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Identifiers

DOI

10.12693/APhysPolA.102.265