The <100> oriented Fe_(83)Ga_(17) 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. The <100> oriented Fe_ (83) Ga_ (17) alloy rods with various NbC contents less than lat% were prepared by the directional soUdification method at a growth rate of 720 mm · h ~ .Low NbC-content was found to affect the oriented grain growth and slightly improve the <100> orientation. Ferrite grain boundaries in the alloys with low NbC contents less than 0.2 at% have greatly curved at higher NbC contents, and a large amount of Nb-rich precipitates were observed in the alloys with high NbC contents of less than 0.2 at% NbC, 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. Magnetostrictive performance obviously decreased with the NbC addition higher than 0.5 at%, and the strain sensitivity under no pre-stress was lower than that in the binary Fe-Ga alloy.