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Equal channel angular extrusion for bulk processing of Fe-Co-2V soft magnetic alloys, part II: Texture analysis and magnetic properties

Journal of Materials Research

Kustas, Andrew K.; Michael, Joseph R.; Susan, D.F.; Karaman, Ibrahim; Jozaghi, Taymaz

In Part I, equal channel angular extrusion (ECAE) was demonstrated as a novel, simple-shear deformation process for producing bulk forms of the low ductility Fe-Co-2V (Hiperco 50A®) soft ferromagnetic alloy with refined grain sizes. Microstructures and mechanical properties were discussed. In this Part II contribution, the crystallographic textures and quasi-static magnetic properties of ECAE-processed Hiperco were characterized. The textures were of a simple-shear character defined by partial {110} and (111) fibers inclined relative to the extrusion direction, in agreement with the expectations for simple-shear deformation textures of BCC metals. These textures were observed throughout all processing conditions and only slightly reduced in intensity by subsequent recrystallization heat treatments. Characterization of the magnetic properties revealed a lower coercivity and higher permeability for ECAE-processed Hiperco specimens relative to the conventionally processed and annealed Hiperco bar. The effects of the resultant microstructure and texture on the coercivity and permeability magnetic properties are discussed.

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TYPE Journal Article YEAR 2018
ScopusOSTIDOI

Characterization of the Fe-Co-1.5V soft ferromagnetic alloy processed by Laser Engineered Net Shaping (LENS)

Additive Manufacturing

Kustas, Andrew K.; Susan, D.F.; Johnson, Kyle J.; Whetten, Shaun R.; Rodriguez, Mark A.; Dagel, Daryl D.; Michael, Joseph R.; Keicher, David M.; Argibay, Nicolas A.

Processing of the low workability Fe-Co-1.5V (Hiperco ® equivalent) alloy is demonstrated using the Laser Engineered Net Shaping (LENS) metals additive manufacturing technique. As an innovative and highly localized solidification process, LENS is shown to overcome workability issues that arise during conventional thermomechanical processing, enabling the production of bulk, near net-shape forms of the Fe-Co alloy. Bulk LENS structures appeared to be ductile with no significant macroscopic defects. Atomic ordering was evaluated and significantly reduced in as-built LENS specimens relative to an annealed condition, tailorable through selection of processing parameters. Fine equiaxed grain structures were observed in as-built specimens following solidification, which then evolved toward a highly heterogeneous bimodal grain structure after annealing. The microstructure evolution in Fe-Co is discussed in the context of classical solidification theory and selective grain boundary pinning processes. Magnetic properties were also assessed and shown to fall within the extremes of conventionally processed Hiperco ® alloys. Hiperco ® is a registered trademark of Carpenter Technologies, Readings, PA.

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TYPE Journal Article YEAR 2018
ScopusOSTIDOI
Results 26–50 of 242
Results 26–50 of 242