Microstructure and magnetic properties ofrapidly solidified Sm(CobalFe0.11Cu0.10Zrx)7 alloys
(State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China)
Abstract: Effects of Zr content on the structural, morphological, and magnetic properties of rapidly quenched Sm(CoFe0.11Cu0.10Zrx)7 (x=0−0.04) alloys were investigated. The Zr-free ribbon crystallizes with the 1׃7H structure as a major phase while the ribbons with Zr addition adopts the 2׃17R structure type. The ribbons with x=0.03 exhibits a highest coercivity, Hci=933.7 kA/m, because a smaller uniform cellular structure along with a lamellar phase is formed. The decrease of Hci above x＞0.03 is mainly related to the formation of 2׃7 phase.
Key words: rapid solidification; annealing; coercivity; nanocrystalline microstructure; SmCo