Scanning electron microscope images of polished cross section of extrusion 2 (75% Mn5b + 25% AncorSteel 150HP). Plane of image is parallel to extrusion direction. Composition analysis by energy dispersive x-ray spectroscopy confirms that dark regions correspond to prior particles of AncorSteel 150HP and light regions correspond to Mn5b bulk metallic glass.
X-ray diffraction of extrusion 2 (75% Mn5b + 25% AncorSteel 150HP). Red vertical lines indicate peaks that index to α-Fe (JCPDF card # 6-696). Split peak at 44°2Θ indicates that bulk metallic glass partially crystallized during extrusion.
Specified compositions of bulk metallic glass powders.
Properties of bulk metallic glass and steel powders. Amorphous powders were sieved to −400 mesh fraction to yield fully amorphous fraction (particle size less than 37 μm). DC coercivity of Mn3b and Mn5b was below the resolution of the instrument (<40 A/m).
Summary of properties of extruded bulk metallic glass (BMG) and steel composites. All samples extruded at a temperature of 580 °C with total processing time of 9 min. Extrusions 1, 3, and 4 were quenched in water after extrusion. Extrusion 2 was air cooled.
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