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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47181

Title: Magnetostriction and {Delta}E effect of melt-spun (Fe{sub 81-x}Co{sub x}Ga{sub 19}){sub 80}B{sub 20} ribbons
Authors: 任盛源
S. U. Jen
S. P. Chang
W. C. Chang
H. W. Chang
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2012-09
Issue Date: 2018-07-04T06:26:21Z
Publisher: Journal of Applied Physics
Abstract: Abstract: (Fe{sub 81-x}Co{sub x}Ga{sub 19}){sub 80}B{sub 20} ribbons, with x = 0, 7, 11, 19, and 23, were made by the single-roller quenching method. The x-ray diffraction patterns showed the A2, D0{sub 19}, and L1{sub 2} diffraction peaks coexisting with the amorphous matrix background. When Fe was replaced by Co, i.e., when x was increased, the first crystallization temperature (T{sub X1}) and Curie temperature (T{sub C1}) rose greatly. With a sufficiently heavy load (or weight) stretching the ribbon downward, the magnetization M{sub S} was pulled along the vertical direction (i.e., the tension-axis). Then, by applying a horizontal field (H{sub E}) up to 6 KOe, we determined the sign and magnitude of the saturation magnetostriction ({lambda}{sub S}). The Young's modulus (E{sub S}) at magnetization saturation and {Delta}E effect was estimated from the stress-strain curve. We discovered that the stress-strain curve of (Fe{sub 81}Ga{sub 19}){sub 80}B{sub 20} exhibits the auxetic (or abnormal) characteristic with {Delta}E < 0. For the rest of the (Fe{sub 81-x}Co{sub x}Ga{sub 19}){sub 80}B{sub 20} with x {ne} 0, their stress-strain curves are normal with {Delta}E > 0. Because the sign of {lambda}{sub S} of the A2 phase is opposite to that of the D0{sub 19} and L1{sub 2} phases, {lambda}{sub S} of (Fe{sub 81-x}Co{sub x}Ga{sub 19}){sub 80}B{sub 20} is much reduced. However, {Delta}E/E{sub 0} Approximately-Equal-To-Or-The-Image-Of 36% is quite large for (Fe{sub 58}Co{sub 23}Ga{sub 19}){sub 80}B{sub 20}.
Relation: 112(5)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47181
Appears in Collections:[光電科學研究所] 期刊論文

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