✍ Scribed by J. Gutiérrez; J.M. Barandiarán; Z. Kaczkowski
No coin nor oath required. For personal study only.
The change of magnetoelastic properties after thermal treatments has been investigated for two groups of metallic glasses. (Fe 79 Co 21 ) 75+x Si 15-1.4x B 10+0.4x (x (at.%) = 0, 2, 4, 6, 8, 10) has been studied both in the as-prepared state and after thermal annealing in an applied magnetic field, to achieve a particular domain structure, at temperatures well below the crystallization temperatures. Changes in the E effect, magnetomechanical coupling (k) and internal friction coefficient (Q -1 ) are reported, reaching values of about 60% of the saturation value E S . Fe 64 Ni 10 Nb 3 Cu 1 Si 13 B 9 alloys annealed in vacuum for 1 h in the temperature range 350-550 • C showed maximum values of the E effect and k of 61% and 0.85, respectively, accompanied by a minimum value of Q of around 2 for the sample annealed at 460 • C. These variations are related to the progress of nanocrystalization. The properties achieved are among the best reported for magnetomechanical applications.
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