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 ℃. 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 ℃ and over 500 ℃, respectively. Iron improved thermal stability of nanocrystalline Ni-Fe alloys. The XRD data indicated that for Ni100-xFex (x > 55) alloys bcc to fcc phase transformed at 300 ℃ and completely at 500℃.
Highlights
Due to their magnetic and mechanical properties, Ni-Fe alloys have been a focus of many researchers
Nanocrystalline Ni-Fe alloy foils were fabricated by using a continuous electrodeposition system, and they were annealed at different temperatures ranging from room temperature to 650 ̊C
It can be seen that the phase transformation from fcc to bcc occurs when iron content in Ni-Fe alloys increases from 30% to 73%
Summary
Due to their magnetic and mechanical properties, Ni-Fe alloys have been a focus of many researchers. Li et al [9,10,11,12,13,14,15,16] electrochemically deposited nanocrystalline Ni100–xFex (x = 15, 21, 45) alloys in a sulfamate-sulfate bath, and studied in detail their thermal stability and mechanical properties. They found that the Ni-Fe alloys possessed high tensile strength (such as Ni85Fe15 alloy, 2.4 GPa [15]). The relationship between embrittlement and XRD patterns was discussed
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