Magnetostrictive properties and detection efficiency of TbDyFe/FeCo composite materials for nondestructive testing
来源期刊：JOURNAL OF RARE EARTHS2019年第2期
论文作者：Liangliang Zhu Kuoshe Li Yang Luo Dunbo Yu Zilong Wang Guiyong Wu Jiajun Xie Zhifeng Tang
文章页码：166 - 170
摘 要：In order to develop a highly sensitive material for nondestructive testing（NDT）,(Tb0.3 Dy0.7)Fe1.95 thin films were deposited on FeCo substrates at room temperature by magnetron sputtering and annealed.The magnetostrictive properties and the detection efficiency of the composite films were investigated.Results demonstrate that the detection efficiency roughly shows regular consistency with the magnetostrictive strain of the TbDyFe films. Heat treatment has a great effect on the crystalline state and the magnetostrictive strain of the composite materials. The as-deposited(Tb0.3 Dy0.7)Fe1.95 films are amorphous, and the saturation magnetostriction（ls） is only 90 ppm. However, the nanostructured crystalline REFe2 is partially separated out in amorphous matrix after annealing at 600C for 1 h, and the ls increases to 265 ppm. Simultaneously, the detection efficiency of the composite materials is obviously improved compared to that of the as-deposited films. The detection signal of traditional FeCo strip is0.4 V at the excitation power of 1.0 P and frequency of 128 kHz and that of the strip increases significantly by depositing one layer of(Tb0.3 Dy0.7)Fe1.95 film. The detection signal of the composite material annealed at 600C is the best, even reaching saturation value of 2.5 V（1.0 P, 128 kHz）. The results may provide us with a method for preparing new materials for NDT.
Liangliang Zhu1，Kuoshe Li1,2，Yang Luo1,2，Dunbo Yu1,2，Zilong Wang1,2，Guiyong Wu1,2，Jiajun Xie1,2，Zhifeng Tang3
1. National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals2. Grirem Advanced Materials Co., Ltd.3. Institute of Advanced Digital Technologies and Instrumentation, Zhejiang University
摘 要：In order to develop a highly sensitive material for nondestructive testing（NDT）,(Tb0.3 Dy0.7)Fe1.95 thin films were deposited on FeCo substrates at room temperature by magnetron sputtering and annealed.The magnetostrictive properties and the detection efficiency of the composite films were investigated.Results demonstrate that the detection efficiency roughly shows regular consistency with the magnetostrictive strain of the TbDyFe films. Heat treatment has a great effect on the crystalline state and the magnetostrictive strain of the composite materials. The as-deposited(Tb0.3 Dy0.7)Fe1.95 films are amorphous, and the saturation magnetostriction（ls） is only 90 ppm. However, the nanostructured crystalline REFe2 is partially separated out in amorphous matrix after annealing at 600C for 1 h, and the ls increases to 265 ppm. Simultaneously, the detection efficiency of the composite materials is obviously improved compared to that of the as-deposited films. The detection signal of traditional FeCo strip is0.4 V at the excitation power of 1.0 P and frequency of 128 kHz and that of the strip increases significantly by depositing one layer of(Tb0.3 Dy0.7)Fe1.95 film. The detection signal of the composite material annealed at 600C is the best, even reaching saturation value of 2.5 V（1.0 P, 128 kHz）. The results may provide us with a method for preparing new materials for NDT.
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