|Title||Texture development and coercivity enhancement in cast alnico 9 magnets|
|Publication Type||Journal Article|
|Year of Publication||2018|
|Authors||Zhang, WY, Valloppilly, S, Li, XZ, Yue, LP, Skomski, R, Anderson, IE, Kramer, M, Tang, W, Shield, J, Sellmyer, DJ|
|Type of Article||Article; Proceedings Paper|
|Keywords||Materials Science, physics, Technology - Other Topics|
The effect of Y addition and magnetic field on texture and magnetic properties of arcmelted alnico 9 magnets has been investigated. Small additions of Y(1.5 wt.%) develop a (200) texture for the arc-melted alnico 9 magnet. Such a texture is hard to form in cast samples. To achieve this goal, we set up a high-field annealing system with a maximum operation temperature of 1250 degrees C. This system enabled annealing in a field of 45 kOe with subsequent draw annealing for the solutionized buttons; we have been able to substantially increase remanence ratio and coercivity, from 0.70 and 1200 Oe for the Y free alnico 9 to 0.90 and 1400 Oe for the Y-doped alnico 9, respectively. A high energy product of 7.3 MGOe has been achieved for the fully heat-treated Y-doped alnico 9. The enhancement of coercivity is believed to arise from the introduction of magne-tocrystalline anisotropy from 80 nm Y2Co17-type grains, which are exchange-coupled to the main-phase alnico rods. (c) 2017 Author(s).
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