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Fabrication and Investigation of Intermetallic Compound-Glassy Phase Composites having Tensile Ductility
Final rept. 22 Feb 2010-22 Feb 2012
TOHOKU UNIV SENDAI (JAPAN)
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The purpose of this research was to produce in-situ ductile crystalline intermetallic compound-glassy composite materials with high strength and good plasticity. A range of composite specimens was prepared Cu-Y, Y-Cu-Ag, Y-Cu-Al, Cu-Y-Ag, Mg-Cu-Y, Mg-Y-Ag, Mg-Y-Zn, Ni-Cu-Ti-Zr using casting and melt spinning techniques. Structure was examined by x-ray diffraction phase transformations were studied by differential scanning and isothermal calorimetry. Crystal-glassy composites formed in Y-Cu-Ag, Y-Cu-Al and Cu-Y-Ag and Ni-Cu-Ti-Zr alloys whereas Mg-based alloys did not smelt well. Ribbon samples of Y-Cu-Ag, Y-Cu-Al and Cu-Y-Ag alloys showed good bending ductility while bulk Ni-Cu-Ti-Zr alloy samples of 2 mm in diameter demonstrated large plasticity owing to martensitic transformation in B2 crystalline phase and TRIP effect. Large deformations up to about 20 were achieved in Ni-Cu-Ti-Zr alloys.
APPROVED FOR PUBLIC RELEASE