Abstract
Abstract The role of Ti and Si additions in the magnetic hardening of rapidly-quenched Zr 2 Co 11 -based nanomaterials has been investigated. Nanocrystalline Zr 17 − x Ti x Co 83 and Zr 18 Co 82 − y Si y are mainly composed of rhombohedral Zr 2 Co 11 and a small amount of orthorhombic Zr 2 Co 11 , hcp Co and cubic Zr 6 Co 23 . Ti addition decreases the mean grain size of the magnetic phases, and thus increases coercivity and energy product from 1.6 kOe and 1.9 MGOe for x = 0 to 2.6 kOe and 3.9 MGOe for x = 2, respectively. Si addition enhances the anisotropy field of the hard phase which increases the coercivity but slightly decreases the magnetization. This work shows that Ti has a positive effect on energy product through refinement of structure.
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