Thermal Stability of Ni-Fe Alloy Foils Continuously Electrodeposited in a Fluorborate Bath

Abstract

Nanocrystalline Ni-Fe alloy foils were fabricated by using a continuous electrodeposition system, and then they were annealed at different temperatures ranging from room temperature to 650˚C. A ductile-brittle-ductile evolution of these alloy foils was observed along with the increase of annealing temperature, and was affected by iron content. The first and second transformation took place at below 300˚C and over 500˚C, respectively. Iron improved thermal stability of nanocrystalline Ni-Fe alloys. The XRD data indicated that for Ni 100-x Fe x (x > 55) alloys bcc to fcc phase transformed at 300˚C and completely at 500˚C.

Novel NiFe/NiFe-LDH composites as competitive catalysts for clean energy purposes

“…6. In both cases, a crystalline fcc metallic phase of Ni-Fe alloy (Ni-rich) is formed (PDF-65-3244 pattern), corresponding to a Ni-Fe with Ni-rich phase [48], which agrees with the composition obtained by EDS and with the [Ni(II)]/[Fe(II)] ratio in the solution. Deposit obtained at À1.4 V presents diffraction peaks of both Ni-Fe alloy (in red) [49,50] and NiFe-LDH structure (in blue) [51], which corroborates the oxidized species also observed by XPS.…”

Structure and properties of electrodeposited functional Ni–Fe/TiN nanocomposite coatings

“…The diffraction peaks (111) of annealed sample in comparison to as deposited nanocomposites showed an increase in intensity irrespective of the current density. The strongest diffraction peak of (111) became intense suggesting a growth of alloy matrix grains as observed by Chang et al [28] in the case of Ni-Fe alloy. The preferred orientation of the crystallites was still retained to (111) crystallographic plane.…”

Influence of ultrasonic in low thermal expansion Fe-Ni electrodeposition process for micro-electroforming

“…Electroforming technology is an important process for extending the wide application of Fe-Ni alloys, such as the complex surface electroforming of Fe-Ni molds, the electroplating of Fe-Ni pins, the electroforming of Fe-Ni packages in electronic packaging, and the UV-LIGA electrodeposition of OLED Fe-Ni mask [5] . However, studies have reported that Fe-Ni alloy prepared by electroforming technology often companies with a poor surface quality (hydrogen pores and nodules), and possess a higher CTE than that prepared by the traditional metallurgical methods [6] , [7] . These are not conducive to the application of Fe-Ni alloy.…”