纳米Fe-Cu体系的结构和电阻温度特性  

Structure and resistance temperature property of nano-sized Fe-Cu system

作　　者：李海波[1] 刘立华[1] 刘梅[1] 郑伟涛[2] 

机构地区：[1]吉林师范大学物理学院 [2]吉林大学材料科学与工程学院,长春130023

出　　处：《吉林大学学报（工学版）》2006年第4期476-479,共4页Journal of Jilin University:Engineering and Technology Edition

基　　金：吉林省杰出青年科学研究计划项目(2202118);吉林大学超硬材料国家重点实验室开放计划项目(2002006)

摘　　要：采用机械合金化方法制备了亚稳Fe50Cu50纳米合金粉末，压片后在氩气中分别进行523K、873K热处理，利用X—ray衍射和Mossbauer效应对样品的结构和相变进行了分析结果表明，机械合金化后的样品为面心立方结构的固溶体，经523K热处理后，亚稳合金已开始分解；经873K热处理后，样品已完全转变为纳米尺寸的α-Fe和Cu的混合体。在15．295K内对热处理后样品的电阻进行了测量，结果表明，样品表现为负的电阻温度系数。Metastable nano-sized Fe50Cu50 alloy powders were prepared by mechanical alloying mechanical alloying, followed by being pressed into pellets. The pellet specimens were heat-treated in argon atmosphere at 523 K and 873 K, respectively. The structure and phase transition were investigated using X-ray diffraction and Mossbauer effect. It was shown that the mechanically alloyed specimens were fcc solid solutions, and the metastable alloys decomposed at 523 K, and ultimately transformed into a mixture of nano-sized α-Fe and Cu at 873 K. The measurement results of resistance of the specimens show the negative resistance temperature coefficient in the temperature range from 15 K to 295 K.

关 键 词：金属材料 亚稳合金 Fe—Cu 结构 相变 电阻温度系数 

分 类 号：TG14[一般工业技术—材料科学与工程]