纳米NiAl-Ni和Ni_3Al-Ni合金的低温电阻特性  

Resistivity of nanostructure NiAl-Ni and Ni_3Al-Ni alloys at low temperature

作　　者：郑海涛 代飞[2] 张莉莉 罗江山[2] 林伟[2] 王凯[2] 易勇[1] 雷海乐[2] Zheng Haitao;Dai Fei;Zhang Lili;Luo Jiangshan;Lin Wei;Wang Kai;Yi Yong;Lei Haile(School of Material Science and Engineering,Southwest University of Science and Technology,Mianyang621010,China;Research Center of Laser Fusion,CAEP,Mianyang621900,China)

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2018年第12期70-75,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11674291)

摘　　要：为了深入理解纳米Al-Ni合金低温下的电子输运过程,使用自主研发的电磁感应加热-自悬浮定向流法制备出Al,Ni和Al-Ni纳米合金粉末,并采用真空热压设备将纳米粉末压制成纳米晶块体,利用自主搭建的低温热电测量系统研究了Al-Ni纳米合金的电阻率随温度(8～300K)的变化规律。研究结果表明:AlNi纳米合金由于形成有序晶相而仍然与Al,Ni纳米晶一样,电阻率随温度的降低而降低。纳米Ni_3Al-Ni和NiAl-Ni在居里温度点附近出现了电阻率随温度变化的极大值点,因为单质Ni的影响,Ni_3Al-Ni的居里温度比粗晶Ni_3Al提高了20K。由于磁子-电子散射作用和声子-电子散射作用,纳米Ni_3Al-Ni,NiAl-Ni和Ni的电阻率在低温下(8～40K)与温度呈T2和T4关系。Al,Ni and Al-Ni alloy powders were prepared by the flow-levitation method through electromagnetic induction heating,and the nano-powders were compressed into nanostructured samples by vacuum hot pressure sintering furnace.We used the four-point probe method to measure the values of electrical resistivity(ρ)of the nanostructured aluminum,nickel and Al-Ni alloy samples at temperature(T)ranging from8K to300K to explore the relationship between the electrical resistivity and temperature.The results show that the resistivity of nanostructured Al,Ni and Al-Ni alloys decreased with the decrease of temperature due to the formation of ordered crystalline phase.The nanostructured Ni3Al-Ni and NiAl-Ni alloys showed a maximum value of resistivity to temperature slope near the Curie temperature,and the Curie temperature of Ni3Al-Ni was20K higher than that of coarse-grained Ni3Al because of the influence of nickel elemental.The resistivity of nanosturctured Ni3Al-Ni,NiAl-Ni,and Ni show T2and T4law at low temperature(8-40K)due to magneton-electron scattering and phonon-electron scattering.

关 键 词：磁子/声子-电子散射 电阻率 纳米Al-Ni合金 晶界散射 

分 类 号：O513[理学—低温物理]