作　　者： ; ; ;

机构地区： 昆明理工大学材料与冶金工程学院新材料科学与工程制备与加工重点实验室

出　　处： 《稀有金属与硬质合金》 2006年第4期1-5,共5页

摘　　要： 利用气雾法制备了Cu-1.56Cr合金粉末并对其于500℃进行了时效,用高分辨电镜观察了其不同时效阶段的结构,并于时效的前期阶段观察到了两种亚稳结构且均为调制结构。利用电子衍射测定了两种结构的晶格点阵,其中调制结构Ⅰ为在基体的晶格点阵上进行的调制,调制结构Ⅱ为DO3型超结构且与基体之间具有N-W位向关系,是后来体心立方(bcc)单质Cr析出的母相。确定了Cu-1.56Cr合金时效过程的析出惯序为面心立方(fcc)的Cu基固溶体(无序结构)→fcc演化的调制结构Ⅰ→调制结构Ⅱ(典型的DO3结构)→bcc的Cr单质析出相。此两亚稳结构为由fcc过饱和固溶体到bcc析出相的结构变迁提供了过渡。 Cu-1. 56Cr alloy has been prepared by gas-atomization, and the structure of the alloy aging at 500 ℃ at different time were observed. The TEM images show there were two meta-stable structures which were modulated structures at early stage of aging. The lattices were determined by the SAED pat- tern,the modulated structure Ⅰ was modulated based on the lattices of copper. The modulated structure Ⅱ was DO3 structure , the crystallographic relation between the modulated structure and matrix was N-W and probably the modulated structure Ⅱ was matrix of chrome. The precipitation sequence of Cu-1.56Cr alloys was：fcc Cu solution alloy modulated structure I→modulated structure Ⅱ→chrome. Two meta→stable structurs were metastable phase at the transformation from fcc structure to bcc.

关 键 词： 金属材料 时效 合金 调制结构

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]