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Vijayaragavan, G.
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article
Microstructure evolution and phase analysis of Sm<SUB>60</SUB>Ni<SUB>40</SUB> alloy
Abstract
The paper investigates the microstructure evolution and phase analysis of the Sm<SUB>60</SUB>Ni<SUB>40</SUB> alloy. The arc melted sample retained the high temperature stable (>873 K) Sm<SUB>7</SUB>Ni<SUB>3</SUB> and Sm<SUB>3</SUB>Ni<SUB>2</SUB> phases along with the congruently melting SmNi phase. Annealing the as-cast sample at 903 K for 100 h stabilized the high temperature stable (873 K - 903 K) Sm<SUB>3</SUB>Ni<SUB>2</SUB> phase. Rietveld refinement was performed to resolve the crystal structure of Sm<SUB>3</SUB>Ni<SUB>2</SUB> phase and it was observed that Sm<SUB>3</SUB>Ni<SUB>2</SUB> phase stabilizes in monoclinic crystal structure (space group: C2/m) with a lattice parameter of a = 13.49 Å, b = 3.75 Å, c = 9.68 Å and β = 106.6°. The Curie temperature of the Sm<SUB>3</SUB>Ni<SUB>2</SUB> phase was determined to be ∼ 110 K. The high squareness ratio of 82 % along with high coercivity of 3 T indicates that the Sm<SUB>3</SUB>Ni<SUB>2</SUB> phase possess spontaneous uniaxial magnetic anisotropy....