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通过在Co82Zr18合金中添加过渡族元素Cr的方法，利用快淬工艺，制备出了Co82-xZr18Crx（x=0，2，3，4）快淬合金薄带. 利用磁性测量、X光衍射、热磁分析、扫描电子显微镜，对其磁性能、相组成、微结构进行了研究. 实验结果表明，在Co82Zr18合金中添加少量的Cr 可以使其矫顽力（iHc）显著提高. 其中，Co79Zr18Cr3 快淬薄带经600 ℃退火处理后iHc=6.5 kOe. 相分析发现，600 ℃退火后的Co79Zr18Cr3快淬薄带由单一Co11Zr2 相组成，Cr原子进入到了Co11Zr2相的晶格之中替换了原子半径相对较小的Co原子，这导致了Co11Zr2居里温度（TC）的降低却使其磁晶各向异性场（Ha）显著提高；另一方面，通过微结构研究发现，未退火的Co79Zr18Cr3快淬薄带由5080 nm 的等轴晶粒组成. 经600 ℃退火后，其晶粒形态并未发生改变然而晶粒尺寸却增长到400500 nm.
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关键词:
- Co-Zr-Cr合金薄带/
- 矫顽力/
- Co11Zr2相/
- 热处理
The Co82-xZr18Crx (x=0, 2, 3, 4) alloys are produced by melt-spinning. It is found that a proper addition of Cr can improve the coercivity significantly and a maximum coercivity of 6.5 kOe is obtained in the Co79Zr18Cr3 ribbon after having been annealed at 600 ℃. X-ray diffraction and thermomagnetic analysis are employed to determine its phase composition. It is found that the sample is comprised of the single Co11Zr2 and the Cr atoms enter into its lattice. A significant enhancement in the magnetocrystalline anisotropy field of Co11Zr2 is observed. SEM investigations show a microstructure consisting of equiaxed grains whose average size is about 400-500 nm. The coercivity enhancement in the Co79Zr18Cr3 alloy is ascribed to the increase in Ha.-
Keywords:
- Co-Zr-Cr melt-spun ribbons/
- coercivity/
- Co11Zr2 phase/
- heat treatment
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中国物理学会期刊
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