Study on Magnetic Stability of Aluminum-Nickel-Cobalt Alloy

Update:10 Nov 2018
Summary:

Aluminum-nickel-Cobalt Alloy is widely used due to its […]

Aluminum-nickel-Cobalt Alloy is widely used due to its good temperature stability. Due to the limitations of the test equipment, the stability of the aluminum-nickel-cobalt alloy over time can not be accurately characterized. In this context, through the construction of non-destructive magnetoelectric performance test device for hard magnetic materials; through the small gradient temperature rise experiment, preferably -70 ° C ~ 130 ° C, -70 ° C ~ 190 ° C, -196 ° C ~ 130 ° C and -196 Four kinds of hot and cold cycle stabilization processes were carried out at °C~190°C. The microstructure, grain size, orientation, texture and microstructure of different batches of aluminum-nickel-cobalt alloy were studied by XRD, EBSD, TEM and MFM.

The aluminum-nickel-cobalt alloy has a body-centered cubic structure, the crystal orientation is 100-direction, and the spatial configuration is columnar crystal; as the temperature increases, the apparent magnetic domain of the aluminum-nickel-cobalt alloy gradually becomes larger, and the order and uniformity decrease; As time goes on, the apparent magnetic domain of the aluminum-nickel-cobalt alloy gradually becomes larger, and the order and uniformity are lowered.

The apparent magnetic domain of the aluminum-nickel-cobalt alloy stabilized by the hot and cold cycle increases with the increase of the temperature difference between the hot and cold cycles, and the temperature difference between the magnetic induction and the thermal cycle increases and increases; after the thermal cycle, the aluminum-nickel-cobalt alloy 1 and The order of 2 phases increased and the grain size did not change significantly.

In the long-term stability test of aluminum-nickel-cobalt alloy, the magnetic irreversible loss decreases with the increase of the temperature difference between the hot and cold cycles; the longer the storage time of the magnetic steel, the smaller the magnetic irreversible loss. After the aging-stabilized aluminum-nickel-cobalt alloy, the elements diffuse, the order of 1 and 2 increases, the grain grows and the uniformity increases, and the apparent magnetic domain becomes larger; the aluminum treated by the aging cooling cycle is stabilized. Nickel-cobalt alloy, Alnico 8-1 alloy has better stability in long-term stability test than other batches.