熔体快淬Pr(Fe_(1-x)Co_x)_2合金的结构和磁性

STRUCTURE AND MAGNETIC PROPERTIES OF MELT SPUN Pr(Fe_(1-x)Co_x)_2 ALLOYS 

通过熔体快淬方法获得Ｐｒ（Ｆｅ１ － ｘＣｏｘ）２ 合金条带，经过Ｘ 射线衍射、差示扫描量热计和磁性测量对其结构、磁性和热稳定性进行了研究．发现当Ｃｏ 的含量ｘ 大于０－２ 时才可能获得Ｐｒ（Ｆｅ ，Ｃｏ）２ 立方Ｌａｖｅｓ 相化合物．对Ｐｒ（Ｆｅ０ ．６Ｃｏ０ ．４）２ 合金，在快淬速度为３０ ｍ／ｓ 时，条带由Ｐｒ２（Ｆｅ，Ｃｏ）１７ ，Ｐｒ（Ｆｅ，Ｃｏ）２ 和富稀土相组成；在速度为４０ ｍ／ｓ 时，获得了几乎单相的Ｐｒ（Ｆｅ０ ．６Ｃｏ０．４）２ 化合物，其居里温度为３０５ ℃；在速度为４５ ｍ／ｓ 时，除了Ｐｒ（Ｆｅ０ ．６Ｃｏ０ ．４）２ 化合物外，还存在少量的非晶相．Ｐｒ（Ｆｅ０．６Ｃｏ０．４）２ 化合物在７７０ ℃以上发生分解．用４０ ｍ／ｓ 快淬纳米晶粉胶粘磁体有大的磁致伸缩系数（λ∥－ λ⊥＝ １４０ ×１０ － ６） 和高的硬磁性能（ｉＨｃ＝ ３９８ ｋＡ／ｍ） ．

Pr(Fe\-\{1- x \}Co\- x )\-2 ribbons have been prepared by melt\|spinning method.Their structure,magnetic properties and thermal stability are investigated.It is found that Pr(Fe,Co)\-2 cubic Laves phase can form only when x ≥0 2 at wheel speed of 45?m/s. For Pr(Fe\-\{0.6\}Co\-\{0.4\})\-2 alloy, at wheel speed of 30?m/s, the ribbon consistes of a mixture of Pr\-2(Fe,Co)\-\{17\}, Pr(Fe,Co)\-2 and rare earth\|rich phase. Almost Pr(Fe\-\{0.6\}Co\-\{0.4\})\-2 nanocrystalline single phase with a Curie temperature of 305?℃ is obtained at wheel speed of 40?m/s. Except Pr(Fe\-\{0.6\}Co\-\{0.4\})\-2 compound a small amount of amorphous phase is observed at wheel speed up to 45?m/s. Pr(Fe\-\{0.6\}Co\-\{0.4\})\-2 compound becomes unstable above 770?℃. The resin\|bonded Pr(Fe\-\{0.6\}Co\-\{0.4\})\-2 nanocrystalline compound which is obtained at wheel speed of 40?m/s combines high magnetostriction ( λ ∥-λ ⊥ =140×10 -6 ), with significant magnetic coercivity, i H c=398?kA/m.