The microstructural evolutions of precipitates formed in a Cu75–Fe5–Ni20 alloy on isothermal annealing at 873 K and 1073 K have been investigated by means of transmission electron microscopy (TEM). Nano-scale magnetic particles were formed
randomly in the Cu-rich matrix after receiving a short annealing due to phase decomposition in the alloy. With increasing the isothermal annealing time, however, the striking features that two or more nano-scale particles with a cubic shape and a rod shape were aligned linearly along 100 directions
were observed on isothermal annealing at 873 K and 1073 K, respectively. To investigate electro-magnetic properties of precipitates in a Cu–Fe–Ni alloy, the superconducting quantum interference device (SQUID) magnetometer and physical property measurement system (PPMS) were also
complemented. The present study revealed significant influences that the magnetic properties of the specimens were closely related to the microstructures in the Cu–Fe–Ni alloy, which microstructures significantly depend on the isothermal annealing temperature.
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