Pressure dependencies of magnetostrictive strain and d coefficient in Terfenol‐D after thermal or magnetic annealing
Pressure dependencies of magnetostrictive strain and d coefficient in Terfenol‐D after thermal or magnetic annealing
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DOI：
10.1063/1.357995
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发表时间：
1994-11
影响因子：
3.2
通讯作者：
N. Galloway;R. D. Greenough;A. Jenner;M. Schulze
中科院分区：
文献类型：
--
作者：
N. Galloway;R. D. Greenough;A. Jenner;M. Schulze
磁致伸缩应变系数d33的压力依赖性和在120 kA m−1的外加磁场中的最大应变已经在热退火或磁退火之前和之后的Terfenol-D样品中测量。平行于与沿[112]轴沿着取向的晶粒垂直的[111]轴的退火场Ha的应用导致d33增加多达81%，所施加的单轴预应力低至3 MPa。最佳d33值随沿[112]轴沿着施加的应力的变化显示了磁退火后的异常振荡。讨论了退火过程的热效应和磁效应，并提出了一种解释磁退火的机制。
The pressure dependence of the magnetostrictive strain coefficient, d33, and maximum strains in applied fields of 120 kA m−1 have been measured in samples of Terfenol‐D before and after thermal or magnetic annealing. Application of an annealing field, Ha, parallel to the 〈111〉 axes which are normal to grains oriented along the [112] axis, leads to an increase in d33 of as much as 81%, with applied uniaxial prestresses as low as 3 MPa. The variation of optimum d33 values as a function of stress applied along the [112] axis shows anomalous oscillations after magnetic annealing. The thermal and magnetic effects of the annealing procedures are discussed and a mechanism to explain magnetic annealing is proposed.