采用熔体急冷法制备了Al90Ni2Y8和Al84Ni8Y8合金条带,并用XRD进行了结构表征, 用差示扫描量热仪分析了合金的热稳定性, 使用超导量子干涉仪对 Al90Ni2Y8和Al84Ni8Y8非晶态及部分晶化态合金的磁性进行了研究. 结果表明, Al90Ni2Y8和Al84Ni8Y8非晶合金为抗磁性, 而且随着Ni含量的增加, 合金更容易被磁化. 当磁场强度达到0.5 T时,Al90Ni2Y8合金对应的比磁化强度为-0.083 Am2/kg, 磁化率为-1.66×10-5, 而Al84Ni8Y8合金对应的比磁化强度为-0.091 Am2/kg, 磁化率为-1.82×10-5. 当合金部分晶化后, 合金的磁性仍保持抗磁性, 但是比磁化强度的绝对值均显著增加. 当磁场强度为0.5 T时, Al90Ni2Y8合金对应的比磁化强度的绝对值从急冷态的0.083 Am2/kg增大到部分晶化后的0.231 Am2/kg,Al84Ni8Y8对应的比磁化强度的绝对值从急冷态的0.091 Am2/kg增大到部分晶化后的0.163 Am2/kg, 对应的磁化率绝对值分别变为4.62×10-5和3.26×10-5, 说明合金部分晶化后更易被磁化.这是由于部分晶化后, 铁磁性的Ni元素和可增强磁性的Y元素在纳米Al晶体周围显著富集,形成磁性较强的短程有序结构造成的.
Al90Ni2Y8 and Al84Ni8Y8 alloy ribbons were produced by melt–spinning, the structural characterization of the as–quenched samples was performed by XRD, the thermal stability of the as–quenched alloys was characterized using a differential scanning calorimeter (DSC), the magnetism of both Al90Ni2Y8 and Al84Ni8Y8 alloys fully amorphous and partially crystallized were investigated using a superconducting quantum interference device (SQUID). The results show that the magnetism of thamorphous Al90Ni2Y8 and Al84Ni8Y8alloys are diamagnetism, and the alloys are magnetized more easily with higher Ni content. When the magnetic field reaches 0.5 T, the specific magnetizations of Al90Ni2Y8 and Al84Ni8Y8alloy are −0.083 and −0.091 Am2/kg, and the magnetisabilities are −1.66×10−5 and −1.2×10−5, respectively. The magnetism of alloys remains unchanged after partially crystallized, but the absolute value of specific magnetization is correspondingly increased. After partially crystallization, the absolute value of specific magnetization of the Al90Ni2Y8 alloy increases from 0.083 Am2/kg to 0.231 Am2/kg, and that of the Al84Ni8Y8 alloy increases from 0.091 Am2/kg to 0.163 Am2/kg corresponding to a magnetic field of 0.5 T, and also the absolute value of magnetisability reaches to 4.62×10−5 and 3.26×10−5, respectiely, which is attributed to the Ni and Y elemental build–up around the nanometer sized pure Al crystals after partially crystallizatin.
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