【摘要】：鐵基非晶合金具有優(yōu)異的軟磁及力學(xué)性能,且成本低廉、資源豐富,在變壓器、傳感器等電力電子領(lǐng)域有廣泛應(yīng)用,吸引了科研工作者的關(guān)注。對(duì)鐵基非晶合金優(yōu)異軟磁及力學(xué)性能產(chǎn)生機(jī)理的研究具有重要意義。本文以鐵基非晶合金為研究對(duì)象,利用電弧熔煉及單輥快淬法制備了FeNiPC非晶合金條帶,利用X射線衍射儀、振動(dòng)樣品磁強(qiáng)計(jì)等技術(shù)測(cè)試了條帶的微觀結(jié)構(gòu)與軟磁性能,運(yùn)用能帶理論等詳細(xì)深入地討論了其影響機(jī)理;為進(jìn)一步研究Fe基非晶合金力學(xué)性能與其微觀結(jié)構(gòu)之間存在的關(guān)系,制備了非晶形成能力較好的塊體非晶合金FeCoBSiNb,同時(shí)對(duì)比研究了多種非晶合金原子結(jié)構(gòu)不均勻性,基于局域震蕩模型、運(yùn)用最小二乘法擬合等方法得出了力學(xué)性能與原子結(jié)構(gòu)不均勻性之間的關(guān)系。主要工作包括:在FePC三元合金基礎(chǔ)上,用適量Ni替換Fe,研制出了具有較好軟磁性能的Fe80-xNix P13C7(x=0-30)非晶合金條帶,研究了Ni元素替換對(duì)非晶合金條帶熱力學(xué)穩(wěn)定性、軟磁性能等的影響及機(jī)理。研究發(fā)現(xiàn),隨著Ni含量增加,非晶合金條帶熱學(xué)穩(wěn)定性呈現(xiàn)先降低后增強(qiáng)的趨勢(shì);而同時(shí),矯頑力則隨之逐漸下降、有效磁導(dǎo)率隨之增加,非晶合金條帶的軟磁性能得到改善;居里溫度隨之提高,呈現(xiàn)先增大達(dá)到一個(gè)極大值,而后減小的趨勢(shì)。以FeCo BSiNb塊體非晶合金作為實(shí)驗(yàn)研究對(duì)象,利用低溫比熱計(jì)算,得到原子尺寸結(jié)構(gòu)不均勻性(ASSH)所占的比例(f),利用最小二乘法對(duì)低溫比熱進(jìn)行擬合,得到了德拜溫度與愛(ài)因斯坦溫度之間的關(guān)系;通過(guò)對(duì)比研究多種非晶合金及其主組元的德拜溫度,發(fā)現(xiàn)非晶合金的德拜溫度具有遺傳主組元的特性,非晶合金的微觀組成可認(rèn)為是簡(jiǎn)單的諧振動(dòng)模式;研究同時(shí)發(fā)現(xiàn),非晶合金彈性模量也具有遺傳性,并隨原子結(jié)構(gòu)不均勻性降低而增大。
[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.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG139.8

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本文編號(hào)：2444632