Thermal stability of nanocrystalline Ni- and Co-based pulsed current electrodeposits: correlation of calorimetric measurements and microstructure development upon annealing
Journal article, 2017

The exceptional properties associated with nanocrystalline materials are, to a large extent, a result of their high inter-crystalline 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 article describes what can be deduced from calorimetric measurements in the context of what is known about the microstructural evolution upon annealing of nanocrystalline Ni- and Co-based pulsed current electrodeposits. Special emphasis is put on interpreting the shape of the curves obtained by a differential scanning calorimetry (DSC). The temperature ranges for relaxation, segregation, precipitation, as well as abnormal and normal grain growth can be predicted. Also, by evaluating the shift in peak temperature with heating rate (Kissinger plot), the activation energies for grain growth can be obtained for the different materials.

Grain growth

Activation energy

Electrodeposition

Nanocrystalline material

Transmission electron microscopy (TEM)

Differential scanning calorimetry (DSC)

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 Hibbard

University of Toronto

Transactions of the Institute of Metal Finishing

0020-2967 (ISSN)

Vol. 95 1 20-24

Driving Forces

Sustainable development

Subject Categories

Materials Engineering

Areas of Advance

Materials Science

DOI

10.1080/00202967.2017.1263475

More information

Latest update

5/18/2018