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Abstract
Abstract This review focuses on grain growth behaviors and the underlying mechanisms of bulk electrodeposited nanocrystalline nickel and nickel-iron alloys. Effects of some important factors on grain growth are described. During thermal-induced grain growth process, grain boundary migration plays a key role. For similar thermal conditions, due to grain boundary mobility with solute drag, limited grain growth occurs in nanocrystalline alloys, as compared to pure metals. Nonetheless, in the case of stress-induced grain growth process, there are a variety of mechanisms in samples having various deformation histories. As an example the grain growth of nanocrystalline nickel and Ni-20%Fe alloy with nearly the same grain-size distribution and average grain size is compared in this paper. Thermal analysis indicates nanocrystalline nickel is much more prone to rapid grain growth than nanocrystalline Ni-20%Fe alloy. Nevertheless, grain growth of nanocrystalline Ni-20%Fe is found to be more pronounced than nanocrystalline nickel during rolling deformation.
Highlights
Nanocrystalline (NC) metals and alloys, as a typical species of advanced materials, have gradually become one a great deal of research work has been done and meaningful results have been achieved in the study of the growth behavior of NC grains, there are still some doubts to be studied
This review focuses on grain growth behaviors and the underlying mechanisms of bulk electrodeposited nanocrystalline nickel and nickel-iron alloys
Under the similar heat treatment conditions, due to grain boundary mobility with solute drag, only very limited grain growth can occur in nanocrystalline nickel-iron alloys, as compared to pure nanocrystalline nickel
Summary
Nanocrystalline (NC) metals and alloys, as a typical species of advanced materials, have gradually become one a great deal of research work has been done and meaningful results have been achieved in the study of the growth behavior of NC grains, there are still some doubts to be studied. One of the most important controversies is whether or not the observed grain growth during deformation of NC metals is the result of purely strain induced grain boundary motion. There is some evidence to suggest that the preparation/synthesis methods of bulk NC metals could affect the grain growth behavior. In the present contribution the review provides a brief overview of grain growth or coarsening in bulk electrodeposited NC nickel (Ni) and nickel-iron (Ni-Fe) alloys, expecting to be useful to better understand microstructural stability of nanoscale materials.
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