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Nanostructured WCuNi electrical contact materials to be used in low voltage vacuum switching contactors for nominal currents up to 630 A were developed successfully by hot isostatic pressing. WCuNi composite powder mixtures with copper content of 20 to 40 wt% and 1 wt% Ni were mechanically alloyed in Ar atmosphere by high--energy ball milling with a ratio of milling steel balls: powders mixtures of 8:1 and rotation speed of 400 rpm for 10 and 20 h. The eect of mechanical alloying on thedoi:10.12693/aphyspola.125.349 fatcat:f7p7votpa5hzpluzh5ahd7q2be