Microstructure and magnetostrictive performance of NbC-doped <100>oriented Fe-Ga alloys
来源期刊：International Journal of Minerals Metallurgy and Materials2015年第1期
论文作者：Chao Yuan Ji-heng Li Wen-lan Zhang Xiao-qian Bao Xue-xu Gao
文章页码：52 - 58
摘 要：The <100> oriented Fe83Ga17 alloy rods with various NbC contents less than lat%were prepared by the directional soUdification method at a growth rate of 720 mm·h-1.Low NbC-content was found to affect the oriented grain growth and slightly improve the <100> orientation.Flat grain boundaries in the alloys with low NbC contents less than 0.2at%became greatly curved at higher NbC contents,and a large amount of Nb-rich precipitates were observed in the alloys with high NbC contents.Small amounts of NbC,less than 0.2at%,resulted in an increase in magnetostrictive strain due to the improvement of the <100> orientation,and a high magnetostrictive strain value of 335 ×10-6 under a pre-stress of 15 MPa was obtained in the 0.1 at%NbC-doped alloys.The magnetostrictive performance obviously decreased with the NbC addition higher than 0.5at%,and the strain sensitivity under no pre-stress was lower than that in the binary Fe-Ga alloy.
Chao Yuan，Ji-heng Li，Wen-lan Zhang，Xiao-qian Bao，Xue-xu Gao
State Key Laboratory of Advanced Metals and Materials,University of Science and Technology Beijing
摘 要：The <100> oriented Fe83Ga17 alloy rods with various NbC contents less than lat%were prepared by the directional soUdification method at a growth rate of 720 mm·h-1.Low NbC-content was found to affect the oriented grain growth and slightly improve the <100> orientation.Flat grain boundaries in the alloys with low NbC contents less than 0.2at%became greatly curved at higher NbC contents,and a large amount of Nb-rich precipitates were observed in the alloys with high NbC contents.Small amounts of NbC,less than 0.2at%,resulted in an increase in magnetostrictive strain due to the improvement of the <100> orientation,and a high magnetostrictive strain value of 335 ×10-6 under a pre-stress of 15 MPa was obtained in the 0.1 at%NbC-doped alloys.The magnetostrictive performance obviously decreased with the NbC addition higher than 0.5at%,and the strain sensitivity under no pre-stress was lower than that in the binary Fe-Ga alloy.
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