Directional annealing studies on rapidly solidified Sm–Co–Nb–C alloys
Directional annealing studies on rapidly solidified Sm–Co–Nb–C alloys
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DOI：
10.1016/j.actamat.2011.10.052
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发表时间：
2012-02
期刊：
影响因子：
9.4
通讯作者：
T. V. Jayaraman;J. Shield
中科院分区：
文献类型：
--
作者：
T. V. Jayaraman;J. Shield
本文介绍了在纳米晶永磁合金中形成织构的一种方法。原本各向同性的材料通过高温梯度，诱导晶粒定向生长。通过定向退火研究了熔纺Sm12Co88、（Sm12Co88）99Nb1、（Sm12Co88）99C1和（Sm12Co88） 98nb1c1合金的织构发展。将定向退火样品与常规退火样品进行了比较。通过x射线衍射观察到Sm12Co88和（Sm12Co88） 99nb1合金的强（006）面内织构，并通过磁性测量证实了各向异性（磁性织构~ 20-53%）。在（Sm12Co88） 99c1和（Sm12Co88） 98nb1c1合金中，定向退火只产生轻微织构。织构的发展主要取决于退火温度、升温梯度、平移速度和合金成分。估计Sm12Co88和（Sm12Co88）99Nb1的各向异性晶粒生长活化能分别为~ 28和~ 42kJmol−1。这些结果表明，定向退火作为纳米晶永磁合金织构发展的途径是可行的。
In this paper, a process that develops texture in nanocrystalline permanent magnet alloys is presented. An originally isotropic material is passed through a high up-temperature gradient, inducing directional grain growth. Texture development by directional annealing of melt-spun Sm12Co88, (Sm12Co88)99Nb1, (Sm12Co88)99C1, and (Sm12Co88)98Nb1C1alloys was examined. Samples directionally annealed were compared with conventionally annealed samples. Strong (006) in-plane texture was observed by X-ray diffraction in Sm12Co88and (Sm12Co88)99Nb1alloys and the anisotropy was corroborated by magnetic measurements (magnetic texture ∼20–53%). Directional annealing produced only slight texture in the (Sm12Co88)99C1and (Sm12Co88)98Nb1C1alloys. The development of texture is critically dependent on annealing temperature, the up-temperature gradient, translational velocity, and alloy composition. The activation energy for anisotropic grain growth was estimated to be ∼28 and ∼42kJmol−1for Sm12Co88and (Sm12Co88)99Nb1, respectively. These results indicate that directional annealing as a route to texture development in nanocrystalline permanent magnet alloys is a feasible process.