Nanocrystalline Ni_3Al-type intermetallic phase powder from Ni-base superalloys

摘要

Nanoscale particles of Ni_3Al-type intermetallic phase have been produced by extracting precipitates from Ni-base superalloys. The process is flexible and can be easily manipulated to tailor particle size and composition. Further, it can be readily adopted to produce nanoparticles of many other intermetallic phases with diverse compositions. The Ni_3Al-type nanopowder (approx 100 nm particle size) was characterized by x-ray diffraction and electron microscopy and compared with a micropowder (approx 450 nm particle size). The nanopowder shows enhanced specific magnetization and a slight increase in Curie temperature relative to the micropowder. This change is possibly due to small changes in composition rather than to the reduction in particle size.