Optimization Of Magnetoelastic Properties Of
Pure Nickel By Means Of Heat Treatments
Author(s)
A. L. Morales, A. J. Nieto, J. M. Chicharro, P. Pintado,
G. P. Rodríguez & G. Herranz
Abstract
In this work we include valuable information about the way in which nickel may
become a valuable smart material for some applications and we provide a better
understanding of the influence of internal stresses on its magnetoelastic effects.
The different states of internal stress are achieved via different heat treatments
obtained by modifying three main parameters: the heating temperature, the heating
time and the cooling method. Then, we carried out the next works: first, a
microscopic analysis of the grain size of the samples under different heat
treatments; second, all the tested specimens were subjected to an exhaustive
internal stress analysis via X-Ray diffraction techniques; and third, the ΔE- and
ΔΨ-effects were estimated in order to link the internal stress state of the sample to
its magnetoelastic response. The results can guide us in selecting the most suitable
heat treatment in order to make nickel show the smart properties we desire.
Keywords: magnetoelasticity, internal stress, heat treatments, nickel, X-Ray
diffraction.
1 Introduction
Magnetomechanical materials are a kind of smart material in which there is a
reciprocal coupling between their mechanical and magnetic properties [1]. In this
broad category, described by Jiles in [2], we can find both magnetoelastic and
magnetoplastic materials. The former are those in which the variation of the
altered properties is reversible, whereas the latter are those in which the recovery
of the properties is not necessarily obtained simply on removal of the magnetic
or mechanical action.
Keywords
magnetoelasticity, internal stress, heat treatments, nickel, X-Ray
diffraction
Related Book
Other papers in this volume
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