The synthesis of Fe-Ni nanocrystalline alloys from additive-free electrolytes

The electrodeposition of Fe-Ni alloys from an additive-free simple chloride electrolyte is described. As-deposited alloys contained between 12 and 15% of Ni and were characterized by a hardness in the range of 650-700 HV and grain size below 10 nm. In situ measurements revealed a generation of high internal stress, exceeding during the early stages a value of 1400 MPa and causing the microcrack formation. The relationships between grain size, int ernal stress and microhardness are discussed. (C)1999 Acta Metallurgica Inc .