强磁场对Cu-25%Ag合金析出相及性能的影响

来源期刊：金属学报2010年第9期

论文作者：李贵茂 王恩刚 张林 左小伟 赫冀成

文章页码：1128 - 1132

关键词：强磁场； Cu-25%Ag； Ag析出相； 硬度； 电导率

Key words：high magnetic field； Cu-25%Ag； Ag precipitate； hardness； electrical conductivity

摘    要：在有无磁场条件下进行了Cu-25%Ag(质量分数)合金的凝固实验,研究了强磁场对Cu-25%Ag合金凝固组织中富Cu枝晶内部Ag析出相的影响,测试了合金的硬度和电导率.发现有无磁场条件下,在不同大小的富Cu枝晶内部,Ag析出相的形态和尺寸各不相同,大尺寸富Cu枝晶内部的Ag析出相呈连续的棒状结构,小尺寸富Cu枝晶内部的Ag析出相呈非连续的颗粒状结构.另外,无磁场条件下析出的Ag相数量较多,尺寸较细小;有磁场条件下析出的Ag相数量较少,尺寸较粗大.受到Ag析出相的影响,强磁场条件下合金的硬度降低,电导率升高.对强磁场下Ag析出相的影响机理进行了探讨,并分析了析出相对合金硬度和电导率的影响机制.

Abstract: The solidification experiment of Cu-25%Ag alloy used in high field magnet was carried out under high magnetic field,the precipitation of Ag in Cu-rich dendrites,the hardness and the electrical conductivity were investigated.It was found that the Ag phase precipitated exhibites continuous rod-like morphology in the larger Cu-rich dendrites,and exhibites discontinuous particlelike morphology in the smaller Cu-rich dendrites;the number of the Ag particles is more and the size is thinner in the sample solidified under 0 T than under 12 T high magnetic field.The hardness and electrical conductivity of the alloy have changed due to the size variance of Ag precipitates.