Zha Wusheng, Liu Ying Gao Shengji, Tu Mingjing1(1. College of Material Science & Engineering, Sichuan University, Chengdu 610065, China; 2. College of Material Science & Engineering, Xihua University, Chengdu 610039, China)
The influence of Pr on thermal stability, microstructure, and magnetic properties of melt-spun(Nd_(1-x)Pr_x)_(10.5)(FeCoZr)_(83.5)B_6(x=0,0.2,0.4,0.6,0.8,1.0)alloy was investigated. By sub-overquenching to get the mixture of amorphous and fine crystallites and post annealing under the optimum conditions,bonded magnets with the best magnetic properties were prepared. With the increase of Pr content, H_(ci) increases, but B_r decreases.(BH)_(max) of magnets bonded with 3.25%(mass fraction)epoxy reaches the maximum of 70 6 kJ·m~(-3) at x=(0.6～)0.8. Substitution of Pr for Nd causes the crystallization temperature and crystallization energy to decrease. This thermal stability difference results in that(Nd_(0.2)Pr_(0.8))_(10.5)(FeCoZr)_(83.5)B_6 alloy has a rougher and more inhomogeneous microstructure than that of(Nd_(0.8)Pr_(0.2))_(10.5)(FeCoZr)_(83.5)B_6 alloy, furthermore, leads to the decrease of B_r with the increase of Pr content.
metal materials;permanent magnets; Pr content; thermal stability;magnetic properties; microstructure; rare earths
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