铜铬镧合金中第二相铬颗粒定量金相分析  

QUANTITATIVE METALLOGRAPHIC ANALYSIS OF Cr PHASE IN CuCrLa ALLOY

作　　者：陈坤[1] 张萌[1] 陈晓芳[1] 

机构地区：[1]南昌大学材料科学系,江西南昌330047

出　　处：《南昌大学学报（理科版）》2005年第2期168-172,共5页Journal of Nanchang University(Natural Science)

基　　金：教育部高等学校骨干教师资助计划资助项目(GG430119021010);江西省自然科学基金资助项目(0050022)

摘　　要：比较了电解浸蚀法和化学浸蚀法对Cu0.8wt%Cr0.4wt%La合金金相组织的显示效果及其对定量金相分析的影响。采用蒸馏水(333mL)、磷酸(166mL)、酒精(166mL)、尿素(2g)和异丙醇(33mL)的混合溶液作为电解液,在电流密度为1A/cm2,浸蚀时间为20sec的条件下浸蚀试样。对试样在时效过程中第二相的几何特征参数变化进行了定量金相分析。结果表明:电解浸蚀法可以有效消除试样磨制过程中的划痕,更加突出地显示合金中铬相的金相形貌,提高定量金相分析的效率和准确度。The electro-etching and chemical etching methods have been used to reveal microstructures of Cu-0.8 wt%Cr-0.4wt%La samples for quantitative metallographic analysis to acquire a optimal etching technique. Samples are determinately etched in a solution of distilled water (333 mL), phosphoric acid (166 mL), alcohol (166 mL), carbamide(2 g) and isopropanol(33 mL) for 20sec under current density of 1A/cm^2. And characteristic geometric parameters of precipitated Cr particles during aging have been measured by using quantitative metallographic method.The results show that electro-etching method may not only effectively avoid the scratch appearance during the sample grind, but also more clearly reveal microstructure and improve the efficiency and accuracy of quantitative metallographic analysis.

关 键 词：化学浸蚀法 电解浸蚀法 铜铬镧合金 定量金相 第二相 

分 类 号：TG115.21[金属学及工艺—物理冶金]