The influences of pulsing current and isothermal annealing on the microstructure and micro-hardness of Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons

Acta Metall Sin

2007, Vol. 42

Issue (1): 91-95 DOI:

Research Articles

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The influences of pulsing current and isothermal annealing on the microstructure and micro-hardness of Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons

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清华大学

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;. The influences of pulsing current and isothermal annealing on the microstructure and micro-hardness of Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons. Acta Metall Sin, 2007, 42(1): 91-95 .

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Abstract The influence of pulsing current and isothermal annealing on the microstructure and micro-hardness of Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons have been studied. It has been found that Fe73.5Cu1Nb3Si13.5B9 amorphous ribbons can significantly nanocrystallized by pulsing current treatment in a short processing time (within 30 s) at low processing temperature (100 K lower than glass transition temperature). At the early stage of pulsing current treatment, the micro-hardness increases by 10% from 8.2 to 9.0 GPa with respect to the initial ribbons, resulted by the structural relaxation. Then an abrupt increase by 50% from 8.2 to 12.4 GPa of the micro-hardness occur, as a result of the precipitation of abundant α-Fe nanocrystals with an average grain size of 8.5 nm. It indicates that pulsing current treatment is an effective way for the nanocrystallization of the studied amorphous alloy.

Key words: pulsing current nanocrystallization micro-hardness isothermal annealing

Received: 17 April 2006

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