Correlations of phase structure and thermal stability for Alnico 8 alloys
- Zhao, J. T.
- Sun, Y. L.
- Liu, L.
- Lee, D.
- Liu, Z.
- Feng, X. C.
- Yan, A. R.
DOIAbstract
The correlations of phase structure and thermal stability for Alnico 8 alloys is analyzed by three-step aging at 650 degrees C, 600 degrees C and 550 degrees C gradually in this paper. After three-step aging the a1 phase is a chess-like structure in transverse direction and a bamboo-like structure in longitudinal direction. Meanwhile the magnetic energy product ((BH)(m)) increases from 9.17 MGOe to 10.59 MGOe, and the remanence temperature coefficient a(RT-180 degrees C) reduces from - 2.31 %%/degrees C to -1.25 %%/degrees C. The MPMS and VSM measurements indicate that three-step aging makes the a1 phase be single domain particles and dispersed distribution, which plays an important role in optimizing the thermal stability of Alnico alloys....
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