Strong, Ductile and Low-Field Magnetostrictive Alloys Based on Fe-Ga Sivaraman Guruswamy, University...

Fe-Zn and other binary iron alloys are being studied to gain improved understanding of magnetotriction and develop new low cost alloys. Powder metallurgy processing involving explosive compaction is used to obtain full density FeZn alloys. Figure on the right shows an x-ray tomography image of a section in an as-explosively compacted Fe-Zn sample prepared for magnetostriction studies. The image is 5.4 x 4.5 mm in size. Full density regions and regions with cracks and central porosity resulting from high compaction pressures can be seen. Strong, Ductile and Low-Field Magnetostrictive Alloys Based on Fe-Ga Sivaraman Guruswamy, University of Utah DMR Fe-Ga alloys show the highest values of magnetostriction in disordered bcc form. Magnetostriction decreased slightly on extended ordering treatment in  ” range. DO 19 and L1 2, ordering decrease magnetostriction to nearly zero or a small negative value. The figures show [200] lattice image and [110] electron diffraction pattern for  ” ordered Fe-27.5 at.% Ga Zn K  X-ray map of Fe-30 at.% Zn alloy (a) before and (b) after homogenization anneal (a)(b) Diffuse X-ray scattering in the ° region arising from short range ordering (SRO). Correlation with available magnetostriction data suggests increased magnetostriction with increase in SRO.