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.]
B掺杂对La-Fe-Si合金微观结构及磁热效应的影响
投稿时间:2016-05-06  修订日期:2016-06-08
中文关键词:  La-Fe-Si合金  B掺杂  熔体快淬  居里温度  磁熵变
基金项目: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)
中文摘要:
      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。
The effect of B doping on the microstructure and magnetocaloric of La-Fe-Si alloys
英文关键词:La-Fe-Si alloys  B doping  melt spun  Curie temperature  magnet entropy change
英文摘要:
      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.
作者单位E-mail
卢倩倩 上海大学材料科学与工程学院 angelluqian@163.com 
侯雪玲 上海大学材料科学与工程学院 flybird1656@163.com 
王晓晨 上海大学材料科学与工程学院  
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