Polycrystalline Fe83Ga17 alloy rods with various amounts of yttrium were prepared by high vacuum induction melting. It is found that yttrium addition has a significant effect on the structure and magnetostriction of F...Polycrystalline Fe83Ga17 alloy rods with various amounts of yttrium were prepared by high vacuum induction melting. It is found that yttrium addition has a significant effect on the structure and magnetostriction of Fes3Ga17 alloy. The small addition of yttrium alters the solidification character and the grain shape of Fe83Ga17 alloy, and as a result, columnar grains with the 〈100〉 preferential direction are pro- duced. Yttrium addition improves the magnetostrictive performance of the as-cast Fes3Ga17 alloy. The magnetostriction values of the as-cast alloy with 0.32at% and 0.64at% yttrium addition go up to 119×10^-6 and 137×10^-6 under 15 MPa compressive stress, respectively. The energy dispersive spectroscopy （EDS） result shows that almost all of the yttrium atoms exist in the Y2Fe17-xGax phase. A small amount of this kind of secondary phase cannot obviously increase the saturate magnetic field.展开更多
The Fe83Ga17 alloy rods with h100 i preferential orientation was prepared by directional solidification method.The dimension of oriented Fe83Ga17 rods is large up to 40 mm greater than diameter in previous investigati...The Fe83Ga17 alloy rods with h100 i preferential orientation was prepared by directional solidification method.The dimension of oriented Fe83Ga17 rods is large up to 40 mm greater than diameter in previous investigations of3–10 mm.The growth direction of columnar grain is nearly parallel to the solidification direction of rods.The deviation angle between axial direction and h100 i direction of columnar crystal was investigated by method of electron backscattering diffraction, and the deviation is smaller than10°.The large columnar grain and h100 i preferential orientation along axial direction of rods could be attributed to the calm solid–liquid interface during solidification process that is difficultly formed due to electromagnetism agitation in induction heating zone-melting method.The corresponding magnetostriction is large up to 290 9 10-6under pre-compressive press of 15 MPa.展开更多
基金supported by the National Basic Research Priorities Program of China (No.2011CB606304)the Program for New Century Excellent Talents in Chinese Universities (No.09-0212)the China Postdoctoral Science Foundation Funded Project (No.2011M500229)
文摘Polycrystalline Fe83Ga17 alloy rods with various amounts of yttrium were prepared by high vacuum induction melting. It is found that yttrium addition has a significant effect on the structure and magnetostriction of Fes3Ga17 alloy. The small addition of yttrium alters the solidification character and the grain shape of Fe83Ga17 alloy, and as a result, columnar grains with the 〈100〉 preferential direction are pro- duced. Yttrium addition improves the magnetostrictive performance of the as-cast Fes3Ga17 alloy. The magnetostriction values of the as-cast alloy with 0.32at% and 0.64at% yttrium addition go up to 119×10^-6 and 137×10^-6 under 15 MPa compressive stress, respectively. The energy dispersive spectroscopy （EDS） result shows that almost all of the yttrium atoms exist in the Y2Fe17-xGax phase. A small amount of this kind of secondary phase cannot obviously increase the saturate magnetic field.
基金financially supported by the Major State Basic Research Development Program of China (973 Program) (No. 2011CB606304)the Program for New Century Excellent Talents in University of China (No. NCET-09-02120)the National Natural Science Foundation of China (No. 51271019)
文摘The Fe83Ga17 alloy rods with h100 i preferential orientation was prepared by directional solidification method.The dimension of oriented Fe83Ga17 rods is large up to 40 mm greater than diameter in previous investigations of3–10 mm.The growth direction of columnar grain is nearly parallel to the solidification direction of rods.The deviation angle between axial direction and h100 i direction of columnar crystal was investigated by method of electron backscattering diffraction, and the deviation is smaller than10°.The large columnar grain and h100 i preferential orientation along axial direction of rods could be attributed to the calm solid–liquid interface during solidification process that is difficultly formed due to electromagnetism agitation in induction heating zone-melting method.The corresponding magnetostriction is large up to 290 9 10-6under pre-compressive press of 15 MPa.
