Influences of compressive stress on the narrow hysteresis and
piezomagnetic coefficient for the <110> oriented
Tb_{0.27} Dy_{0.73}
Fe_{1.95} alloys at high drive levels
Affiliations: [a] Department of Mechanics and Engineering Sciences,
School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu,
China
Correspondence:
[*]
Corresponding author: Youhe Zhou, Key Laboratory of Mechanics on
Environment and Disaster in Western China, The Ministry of Education of China,
and Department of Mechanics and Engineering Sciences, School of Civil
Engineering and Mechanics, Lanzhou University, Lanzhou, Gansu 730000, China
Tel./Fax: +86 931 8910340; E-mail: zhouyh@lzu.edu.cn
Abstract: In this paper, the influences of compressive stress on the narrow
hysteresis (magnetostriction hysteresis, W_h) and maximum
piezomagnetic coefficient (d_{33}^{Max}) of the <110>
oriented
Tb_{0.27}Dy_{0.73}Fe_{1.95}
polycrystalline alloys have been investigated at high drive levels. The
simultaneous measurements of magnetostriction and magnetization are carried out
as a function of applied magnetic field 0 < H < 800 kA/m and compressive
stress 0 to 50 MPa. The results show that the magnetostriction increases
sharply in the low and/or moderate magnetic field, and than gains its
saturation slowly with increase of the applied magnetic field. However,
according to increase of the compressive stress, the magnetostriction decreases
in the low and moderate magnetic field, while the saturation magnetostriction
(λ _s ) increases. Specifically, λ
_s increases from 1143 × 10^{ - 6}
to 1778 × 10^{ - 6} when the compressive stress
increases from 0 to 50 MPa and W_h increases from 7.90 to
27.22 kA/m at the same conditions. In addition, the characteristics of
d_{33}^{Max} are reported under varied compressive stresses.
It is found that the higher compressive stress the lower is
d_{33}^{Max}, while at a fixed compressive stress,
d_{33}^{Max} in the forward magnetostriction process is
lower than that in the reversal magnetostriction process. These results
presented are available for a kind of Tb-Dy-Fe alloys applications.
