Al-Ni-Y-Co-Fe铝基非晶态及部分晶化态合金的磁性研究

发布时间：2018-08-28 09:02

【摘要】：铝基非晶合金的优良性能主要表现在具有超高强度（可达1000MPa以上）和良好的韧性，且铝基非晶合金发生部分晶化后，析出纳米尺度的铝粒子，弥散分布于非晶基体，形成纳米晶/非晶复合材料，使材料的强度进一步提高。对铝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备大块铝基非晶合金，然而对铝基非晶合金的磁性研究几乎很少报道。如果铝基非晶合金也兼具有特殊的磁性能，则对材料的开发和利用将起到推动性的作用。 本课题主要研究Al-Ni-Y-Co-Fe五元铝基非晶合金的磁性，采用熔体急冷法制备五元铝基非晶条带，得到玻璃形成能力较好的Al85Ni5Y6Fe2Co2非晶合金，以此成分的合金为研究对象，用振动样品磁强计对急冷态的两种合金进行磁性测试。结果显示，两种合金的磁化曲线均过原点并穿过一、三象限，没有剩磁和矫顽力。分析发现该合金完全非晶态和部分晶化态的磁性均为顺磁性与抗磁性的叠加。对曲线线性部分进行拟合后得到初始磁化率，完全非晶的初始磁化率为2.41×10-4，而不完全非晶的初始磁化率是2.73×10-4，显然不完全非晶更容易被磁化。为了进一步探究其磁性与晶化度之间的关系，，分别对完全非晶合金进行330℃和390℃退火处理后进行磁性测试。结果表明，随退火温度的升高，合金的线性部分初始磁化率由2.53×10-4增大到2.81×10-4，即退火390℃时合金更容易被磁化。综合分析得出：Al85Ni5Y6Fe2Co2非晶合金基体中有抗磁性结构的出现，且随着晶体的析出，这种抗磁结构越多，表现出来的抗磁性越强；Al85Ni5Y6Fe2Co2非晶合金的初始磁化率随着晶体析出量的增多而增加，即纳米铝粒子含量的增多使得复合材料的顺磁性增大。
[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

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