摘要
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。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,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210K提高到233K,最大等温磁熵变由5.47J/kg·K提高到9.40J/kg·K。
The influences of small dose B doping and heat treatment on the microstructure and magnetocaloric properties of La-Fe-Si melt spun ribbons were investigated. The results show that the doping of B promotes the formation of the La（Fe,Si）13 phase, and the La-Fe-Si-B alloys have already acquired more La（Fe,Si）13 phase before heat treatment than La-Fe-Si alloys. During the solidification process, the alloy has the most La（Fe,Si）13 phase when B doping content is 0.08. B doping is beneficial to refining the microstructure during rapid solidification; the refined microstructure shortens the element diffusion path of peritectoid reaction in the following process of heat treatment （a-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 are optimized by B doping, and their Curie temperature and magnetocaloric effect are improved. The Curie temperature of the ribbons changes from 210 K to 233 K, and the maximum isothermal magnet entropy change increases from 5.47 J/kg·K to 9.40 J/kg·K when B content increases from 0 to 0.08
作者
卢倩倩
侯雪玲
王晓晨
Lu Qianqian;Hou Xueling;Wang Xiaochen(Shanghai University, Shanghai 200072, China;Laboratory for Microstructures, Shanghai 200072, China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2018年第5期1497-1502,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(U1531120)
上海市自然科学基金(13ZR1415300)
