Nd_2Fe_(14)B/α-Fe纳米晶双相复合永磁合金

Nd_2Fe_(14)B/α-Fe NANOCRYSTALLINE TWO-PHASE COMPOSITE PERMANENT MAGNETIC ALLOYS

采用快淬及热处理工艺，通过复合添加Dy和Ga，制备了高磁性能的Nd2Fe14B／α－Fe纳米晶双相复合永磁合金合金最佳磁性能为：Jr＝1．161T（11．6kGs），Hci＝580．50hA／m（7．30kOe）和（BH）max＝162．7kJ／m3（20．5MGs·Oe）该合金成分为Nd7．5Dy1Fe85B4．5Ga2，其显微组织由晶粒尺寸约为32nm的硬磁相Nd2Fe14B和16nm左右的软磁相α－Fe组成该合金存在显著的剩磁增强效应，剩磁比Jr／Js＝0．754．

The nanocomposite Nd2Fe14B/α-Fe magnets with high magnetic properties have been prepared by adding Dy and Ga, rapid quenching and post heat treatment. The best magnetic properties of Jr=1.161 T (11.6 kGs), Hci=580.50 kA/m (7.30 hOe), and (BH)max=162.7 kJ/m3(20.5 MGs·Oe) are achieved. The composition of the alloy with optimal properties is Nd7.5Dy1Fe85B4.5Ga2. Microstructures of the alloy are composed of Nd2Fe14B hard magnetic phase and α-Fe soft magnetic phase with the grain sizes of 32 urn and 16 nm, respectively. There is a remarkable remance enhancement in this alloy and the ratio of remance Jr/Js=0.754.