Fe基非晶合金软磁及力学性能的研究
发布时间：2019-03-20 21:07
【摘要】：铁基非晶合金具有优异的软磁及力学性能,且成本低廉、资源丰富,在变压器、传感器等电力电子领域有广泛应用,吸引了科研工作者的关注。对铁基非晶合金优异软磁及力学性能产生机理的研究具有重要意义。本文以铁基非晶合金为研究对象,利用电弧熔炼及单辊快淬法制备了FeNiPC非晶合金条带,利用X射线衍射仪、振动样品磁强计等技术测试了条带的微观结构与软磁性能,运用能带理论等详细深入地讨论了其影响机理;为进一步研究Fe基非晶合金力学性能与其微观结构之间存在的关系,制备了非晶形成能力较好的块体非晶合金FeCoBSiNb,同时对比研究了多种非晶合金原子结构不均匀性,基于局域震荡模型、运用最小二乘法拟合等方法得出了力学性能与原子结构不均匀性之间的关系。主要工作包括:在FePC三元合金基础上,用适量Ni替换Fe,研制出了具有较好软磁性能的Fe80-xNix P13C7(x=0-30)非晶合金条带,研究了Ni元素替换对非晶合金条带热力学稳定性、软磁性能等的影响及机理。研究发现,随着Ni含量增加,非晶合金条带热学稳定性呈现先降低后增强的趋势;而同时,矫顽力则随之逐渐下降、有效磁导率随之增加,非晶合金条带的软磁性能得到改善;居里温度随之提高,呈现先增大达到一个极大值,而后减小的趋势。以FeCo BSiNb块体非晶合金作为实验研究对象,利用低温比热计算,得到原子尺寸结构不均匀性(ASSH)所占的比例(f),利用最小二乘法对低温比热进行拟合,得到了德拜温度与爱因斯坦温度之间的关系;通过对比研究多种非晶合金及其主组元的德拜温度,发现非晶合金的德拜温度具有遗传主组元的特性,非晶合金的微观组成可认为是简单的谐振动模式;研究同时发现,非晶合金弹性模量也具有遗传性,并随原子结构不均匀性降低而增大。
[Abstract]:Fe-based amorphous alloy has excellent soft magnetic and mechanical properties, low cost and abundant resources. It has been widely used in the field of power electronics such as transformers, sensors and so on. It has attracted the attention of researchers. It is of great significance to study the generation mechanism of excellent soft magnetic and mechanical properties of Fe-based amorphous alloys. In this paper, Fe-based amorphous alloy was prepared by arc melting and single-roll quenching. The microstructure and soft magnetic properties of FeNiPC amorphous alloy were measured by X-ray diffractometer and vibrating sample magnetometer. The influence mechanism is discussed in detail by using the energy band theory and so on. In order to further study the relationship between mechanical properties and microstructure of Fe-based amorphous alloy, bulk amorphous alloy FeCoBSiNb, with better amorphous forming ability was prepared. Based on the local oscillation model, the relationship between mechanical properties and atomic structure inhomogeneity is obtained by least square fitting. The main work is as follows: on the basis of FePC ternary alloy, the amorphous alloy strip Fe80-xNix P13C7 (x / 0 / 30) with good soft magnetic properties was prepared by replacing Fe, with appropriate amount of Ni. The thermodynamic stability of Ni element replacement to amorphous alloy strip was studied. The influence and mechanism of soft magnetic properties. It is found that with the increase of Ni content, the thermal stability of amorphous alloy strip decreases first and then strengthens, while the coercive force decreases gradually, and the effective permeability increases, and the soft magnetic properties of amorphous alloy strip are improved. The Curie temperature increases with the increase of the temperature, first increasing to a maximum, and then decreasing. Taking FeCo BSiNb bulk amorphous alloy as experimental object, the specific heat of low temperature was calculated by low temperature specific heat calculation, and the proportion of (ASSH) in non-uniformity of atomic size and structure was obtained by using least square method to fit the specific heat of low temperature. The relationship between Debye temperature and Einstein temperature is obtained. By comparing the Debye temperatures of various amorphous alloys and their principal components, it is found that the Debye temperatures of amorphous alloys have the characteristics of hereditary principal components, and the microstructure of amorphous alloys can be considered as a simple harmonic vibration mode. At the same time, it is found that the elastic modulus of amorphous alloys is hereditary and increases with the decrease of atomic structure inhomogeneity.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG139.8
本文编号：2444632
[Abstract]:Fe-based amorphous alloy has excellent soft magnetic and mechanical properties, low cost and abundant resources. It has been widely used in the field of power electronics such as transformers, sensors and so on. It has attracted the attention of researchers. It is of great significance to study the generation mechanism of excellent soft magnetic and mechanical properties of Fe-based amorphous alloys. In this paper, Fe-based amorphous alloy was prepared by arc melting and single-roll quenching. The microstructure and soft magnetic properties of FeNiPC amorphous alloy were measured by X-ray diffractometer and vibrating sample magnetometer. The influence mechanism is discussed in detail by using the energy band theory and so on. In order to further study the relationship between mechanical properties and microstructure of Fe-based amorphous alloy, bulk amorphous alloy FeCoBSiNb, with better amorphous forming ability was prepared. Based on the local oscillation model, the relationship between mechanical properties and atomic structure inhomogeneity is obtained by least square fitting. The main work is as follows: on the basis of FePC ternary alloy, the amorphous alloy strip Fe80-xNix P13C7 (x / 0 / 30) with good soft magnetic properties was prepared by replacing Fe, with appropriate amount of Ni. The thermodynamic stability of Ni element replacement to amorphous alloy strip was studied. The influence and mechanism of soft magnetic properties. It is found that with the increase of Ni content, the thermal stability of amorphous alloy strip decreases first and then strengthens, while the coercive force decreases gradually, and the effective permeability increases, and the soft magnetic properties of amorphous alloy strip are improved. The Curie temperature increases with the increase of the temperature, first increasing to a maximum, and then decreasing. Taking FeCo BSiNb bulk amorphous alloy as experimental object, the specific heat of low temperature was calculated by low temperature specific heat calculation, and the proportion of (ASSH) in non-uniformity of atomic size and structure was obtained by using least square method to fit the specific heat of low temperature. The relationship between Debye temperature and Einstein temperature is obtained. By comparing the Debye temperatures of various amorphous alloys and their principal components, it is found that the Debye temperatures of amorphous alloys have the characteristics of hereditary principal components, and the microstructure of amorphous alloys can be considered as a simple harmonic vibration mode. At the same time, it is found that the elastic modulus of amorphous alloys is hereditary and increases with the decrease of atomic structure inhomogeneity.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG139.8
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