METHOD OF FORMING SINTERED NICKEL-TITANIUM-RARE EARTH (Ni-Ti-RE) ALLOY

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PROBLEM TO BE SOLVED : To provide a superelastic nickel-titanium-rare earth (Ni-Ti-RE) alloy with improved radiopacity. SOLUTION : A sintered nickel-titanium-rare earth (Ni-Ti-RE) alloy comprises : Ni of 35 to 65 at.%; Ti of 35 to 65 at.%; and a rare earth (RE) constituent of 1.5 to 15 at.%, where the sintered Ni-Ti-RE alloy includes a matrix phase and a second phase, and the second phase including a RE element comprises discrete regions in the matrix phase. A method of forming a sintered nickel-titanium-rare earth (Ni-Ti-RE) alloy includes adding one or more powders comprising Ni, Ti, and a rare earth constituent to a powder consolidation unit comprising an electrically conductive die and punch connectable to a power supply. The one or more powders are heated at a ramp rate of about 35°C/min or less to a sintering temperature, and pressure is applied to the powders at the sintering temperature, thereby forming a sintered Ni-Ti-RE alloy. SELECTED DRAWING : None COPYRIGHT : (C)2018, JPO&INPIT