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B掺杂对La-Fe-Si合金微观结构及磁热效应的影响
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上海大学材料科学与工程学院,上海大学材料科学与工程学院,上海大学材料科学与工程学院

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国家自然科学基金资助项目 (项目编号: U1531120);上海市自然科学基金资助 (项目编: 13ZR1415300)


The effect of B doping on the microstructure and magnetocaloric of La-Fe-Si alloys
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School of Materials Science and Engineering,Shanghai University,School of Materials Science and Engineering,Shanghai University,School of Materials Science and Engineering,Shanghai University

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    摘要:

    本文研究了小剂量B元素的掺杂及热处理对La-Fe-Si快淬条带微观结构及磁热性能的影响。研究结果表明:B的掺杂促进了La(Fe,Si)13相的形成,相比于未掺杂B的La-Fe-Si合金,La-Fe-Si-B合金在热处理前就已经获得较多的La(Fe,Si)13相,当B的掺杂量为0.08,快速凝固过程中获得的本文研究了小剂量B元素的掺杂及热处理对La-Fe-Si快淬条带微观结构及磁热性能的影响。研究结果表明:B的掺杂促进了La(Fe,Si)13相的形成,相比于未掺杂B的La-Fe-Si合金,La-Fe-Si-B合金在热处理前就已经获得较多的La(Fe,Si)13相,当B的掺杂量为0.08,快速凝固过程中获得的La(Fe, Si)13相的相对含量最多。B的掺杂有利于快速凝固过程中微观组织结构的细化,这些细化的微观组织缩短了热处理过程中进行包析反应(α-Fe + LaFeSi → La(Fe,Si)13)的元素扩散路径,有利于快速反应生成La(Fe,Si)13相。在热处理过程中,B的掺杂优化了合金的微观组织结构,与没有掺杂B的La-Fe-Si合金相比,B的掺杂使合金热处理组织均匀细化,其居里温度和磁热效应得到提高。当B的掺杂量由0增加到0.08,合金快淬条带的居里温度由210 K提高到233 K,最大等温磁熵变由5.47 J/kg?K 提高到9.40 J/kg?K。

    Abstract:

    The influences of small dose B doping and heat treatment on the phase structure and magnetocaloric properties of La-Fe-Si melt spun ribbons were investigated. The results showed that the doping of B promoted the formation of the La(Fe,Si)13 phase. And La-Fe-Si-B alloys have already acquired more La(Fe,Si)13 phase before heat treatment compared to La-Fe-Si alloys. During the solidification process, it has the most content of the phase of La(Fe,Si)13 when the doping content is 0.08. B doping is beneficial for the refining of microstructure during rapid solidification which shortens the element diffusion path of peritectoid reaction in the following process of heat treatment(α-Fe + LaFeSi → La(Fe, Si)13)and is in favor of the formation of La(Fe,Si)13 phase. In the process of heat treatment, the microstructures of La-Fe-Si alloys were optimized by B doping compared to La-Fe-Si alloys. B doping refines the heat treatment structure of La-Fe-Si alloys and its Curie temperature and magnetocaloric effect has been improved. The Curie temperature of the ribbons changes from 210 K to 233 K,the maximum isothermal magnet entropy change promotes from 5.47 J/kg?K to 9.40 J/kg?K.

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卢倩倩,侯雪玲,王晓晨. B掺杂对La-Fe-Si合金微观结构及磁热效应的影响[J].稀有金属材料与工程,2018,47(5):1497~1502.[Lu Qianqiam, Hou Xueling, Wang Xiaoccheng. The effect of B doping on the microstructure and magnetocaloric of La-Fe-Si alloys[J]. Rare Metal Materials and Engineering,2018,47(5):1497~1502.]
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  • 收稿日期:2016-05-06
  • 最后修改日期:2016-06-08
  • 录用日期:2016-07-15
  • 在线发布日期: 2018-06-08
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