【摘要】：鋁基非晶合金的優(yōu)良性能主要表現(xiàn)在具有超高強度（可達1000MPa以上）和良好的韌性，且鋁基非晶合金發(fā)生部分晶化后，析出納米尺度的鋁粒子，彌散分布于非晶基體，形成納米晶/非晶復合材料，使材料的強度進一步提高。對鋁基非晶合金的研究大多集中在如何提高其玻璃形成能力及制備大塊鋁基非晶合金，然而對鋁基非晶合金的磁性研究幾乎很少報道。如果鋁基非晶合金也兼具有特殊的磁性能，則對材料的開發(fā)和利用將起到推動性的作用。 本課題主要研究Al-Ni-Y-Co-Fe五元鋁基非晶合金的磁性，采用熔體急冷法制備五元鋁基非晶條帶，得到玻璃形成能力較好的Al85Ni5Y6Fe2Co2非晶合金，以此成分的合金為研究對象，用振動樣品磁強計對急冷態(tài)的兩種合金進行磁性測試。結果顯示，兩種合金的磁化曲線均過原點并穿過一、三象限，沒有剩磁和矯頑力。分析發(fā)現(xiàn)該合金完全非晶態(tài)和部分晶化態(tài)的磁性均為順磁性與抗磁性的疊加。對曲線線性部分進行擬合后得到初始磁化率，完全非晶的初始磁化率為2.41×10-4，而不完全非晶的初始磁化率是2.73×10-4，顯然不完全非晶更容易被磁化。為了進一步探究其磁性與晶化度之間的關系，，分別對完全非晶合金進行330℃和390℃退火處理后進行磁性測試。結果表明，隨退火溫度的升高，合金的線性部分初始磁化率由2.53×10-4增大到2.81×10-4，即退火390℃時合金更容易被磁化。綜合分析得出：Al85Ni5Y6Fe2Co2非晶合金基體中有抗磁性結構的出現(xiàn)，且隨著晶體的析出，這種抗磁結構越多，表現(xiàn)出來的抗磁性越強；Al85Ni5Y6Fe2Co2非晶合金的初始磁化率隨著晶體析出量的增多而增加，即納米鋁粒子含量的增多使得復合材料的順磁性增大。
[Abstract]:The excellent properties of aluminum-based amorphous alloys are mainly characterized by their ultra-high strength (up to 1000MPa) and good toughness. After partial crystallization of Al-base amorphous alloys, nanoscale aluminum particles are precipitated and dispersed in amorphous substrates. Nanocrystalline / amorphous composites were formed to further improve the strength of the materials. Most of the studies on aluminum-based amorphous alloys focus on how to improve their glass-forming ability and prepare bulk aluminum-based amorphous alloys, but the magnetic properties of aluminum-based amorphous alloys are rarely reported. If aluminum-based amorphous alloy also has special magnetic properties, it will play an important role in the development and utilization of the material. In this paper, the magnetic properties of Al-Ni-Y-Co-Fe quaternary alumin-based amorphous alloys were studied. The amorphous ribbons were prepared by melt quenching method, and the glass forming ability of Al85Ni5Y6Fe2Co2 amorphous alloys was obtained. The magnetic properties of two rapidly cooled alloys were tested by vibrating sample magnetometer. The results show that the magnetization curves of the two alloys cross the origin and pass through one or three quadrants without remanence and coercivity. It is found that the magnetic properties of the fully amorphous and partially crystallized states of the alloy are the superposition of paramagnetism and diamagnetism. After fitting the linear part of the curve, the initial susceptibility of the complete amorphous is 2.41 脳 10 ~ (-4), while that of the incomplete is 2.73 脳 10 ~ (-4). It is obvious that the incomplete amorphous is more likely to be magnetized. In order to further study the relationship between the magnetic properties and the degree of crystallization, the magnetic properties of fully amorphous alloys were tested after annealing at 330 鈩

本文編號：2208927