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A Combinatorial Approach for Assessing the Magnetic Properties of High Entropy Alloys: Role of Cr in AlCo x Cr 1– x FeNi
Author(s) -
Borkar Tushar,
Chaudhary Varun,
Gwalani Bharat,
Choudhuri Deep,
Mikler Calvin V.,
Soni Vishal,
Alam Talukder,
V. Ramanujan Raju,
Banerjee Rajarshi
Publication year - 2017
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201700048
Subject(s) - spinodal decomposition , materials science , equiaxed crystals , coercivity , high entropy alloys , microstructure , alloy , magnetization , condensed matter physics , spinodal , thermodynamics , phase (matter) , analytical chemistry (journal) , metallurgy , magnetic field , chemistry , physics , quantum mechanics , organic chemistry , chromatography
A combinatorial assessment of composition‐microstructure‐magnetic property relationships in magnetic high entropy AlCo x Cr 1‐x FeNi alloy (0 ≤ x ≤ 1) system has been carried out using compositionally graded alloys fabricated via laser additive manufacturing. At one end, the AlCoFeNi composition (x = 1) consisted of equiaxed B2 grains, exhibiting very early stages of phase separation (only compositional partitioning) into Ni–Al rich and Fe–Co rich regions within grains of the B2 phase. At the other extreme, the AlCrFeNi composition (x = 0) exhibited grains with pronounced spinodal decomposition, resulting in a B2 + bcc microstructure with the degree of spinodal decomposition progressively increasing with Cr content in these AlCo x Cr 1–x FeNi alloys. While the saturation magnetization (M s ) monotonically increases six times from x = 0 to x = 1, the coercivity (H c ) variation is non‐monotonic, increasing seven times from x = 0 to x = 0.4, and subsequently decreasing fourteen times from x = 0.4 to x = 1.0. The magnetic phase transition temperature (T c ) for these alloys also increases monotonically with increasing Co content with a second phase transition exhibited in a certain range of compositions between x = 0.6 to x = 0.8. Such substantial changes in the magnetization behavior and properties of magnetic high entropy systems opens possibilities of tuning these alloys for specific soft or hard magnetic component applications.