Stress dependence of magnetostrictions and strains in {l_angle}111{r_angle}-oriented single crystals of Terfenol-D
- State Key Laboratory for Magnetism, Institute of Physics, CAS, P.O. Box 603, Beijing 100080, Peoples Republic of (China)
Single crystals of Tb{sub 0.27}Dy{sub 0.73}Fe{sub 2} were prepared successfully by the Czochralski (CZ) method using a magnetic levitation cold crucible first in this laboratory. The Laue x-ray technique and metallography verified its twin-free single crystalline perfection. Weidmanstatten precipitation (WSP) slightly exists in these specimens with WSP platelets parallel to the {l_brace}111{r_brace} planes of Terfenol-D. Saturation magnetostriction were measured along three principal crystallographic axes [111], [11{bar 2}] and [1{bar 1}0] of single crystal Tb{sub 0.27}Dy{sub 0.73}Fe{sub 2} with magnetic field parallel and then perpendicular to the measuring direction, which gives an intrinsic magnetostriction {lambda}{sub 111}=1640{times}10{sup {minus}6} for {l_angle}111{r_angle} easy axis. Stress dependence of magnetostrictions and strains measured along three mutually perpendicular axes, [111], [11{bar 2}], and, [1{bar 1}0] on {l_angle}111{r_angle}-oriented single crystalline rods of Terfenol-D indicates that apparent magnetostriction for {l_angle}111{r_angle} direction increases with increasing applied compressive stress along the rod axis, and reaches 2375{times}10{sup {minus}6} under a stress of 24 MPa and a magnetic field of 20 kOe. Maximum {ital d}{sub 33} decreases with the increment of applied stresses and the amount of WSP, and ranges from 1{times}10{sup {minus}6}/Oe to 6{times}10{sup {minus}6}/Oe at about 500 Oe. Less hysteresis appears. Magnetizing processes are calculated and compared with the measured changes of magnetostriction. The authors conclude that {l_angle}111{r_angle}-oriented single crystal of Terfenol-D is suitable for precise displacement actuators although it would be much better to eliminate the WSP precipitation. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 280085
- Report Number(s):
- CONF-951101--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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