非晶态及部分晶化态Al-Ni-Y合金的磁性

来源期刊：金属学报2011年第3期

论文作者：龚静 杨红旺 杨柏俊 王瑞春 李荣德 王建强

文章页码：333 - 336

关键词：非晶合金； 纳米晶化； 磁性

Key words：amorphous alloy； nanocrystallization； magnetism

摘    要：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0.5T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.

Abstract: 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 the amorphous Al₉₀Ni₂Y₈ and Al₈₄Ni₈Y₈ alloys 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 Al₈₄Ni₈Y₈ alloy are -0.083 and -0.091 Am²/kg,and the magnetisabilities are -1.66×10^-5 and -1.82×10^-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,respectively,which is attributed to the Ni and Y elemental buildup around the nanometer sized pure Al crystals after partially crystallization.