Thermal stability in nanocrystalline electrodeposits - a comparison of Ni- and Co-based materials
Paper in proceedings, 2009

The exceptional properties associated with nanocrystalline materials are to a large extent a result of their high intercrystalline volume fraction. However, the intrinsic instability of the nanostructured state may compromise the gain in properties by the occurrence of grain growth during exposure at elevated temperatures. Thermal stability is therefore a fundamental materials issue for nanocrystalline materials. This paper summarizes findings for Ni- and Co-based materials obtained by a combination of characterization techniques (DSC, XRD, TEM, and Tomographic Atom Probe (TAP)). Alloying as well as phase- and ordering transformations are found to affect the grain growth behavior. The findings for the different materials are the basis for a model in which it is stated that segregation leads to an improved thermal stability of the nanocrystalline structure by the combination of a thermodynamic effect (reduction in driving force for grain growth) and a kinetic effect (reduction in grain boundary mobility).

effect of solutes

electrodeposits

TEM

thermal stability

Ni

nanomaterial

Co

Author

Uta Klement

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Melina da Silva

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Glenn D. Hibbard

Proceedings of the Risø International Symposium on Materials Science

0907-0079 (ISSN)

231-238

Subject Categories

Materials Engineering

ISBN

978-87-550-3776-2

More information

Created

10/8/2017