论文部分内容阅读
一般认为Cu—Zn—Al合金电子浓度大于1.454时,马氏体为18R和2H两种类型的长周期结构,其基面(001)面上的原子有序排列,X射线分析初步判断18R型马氏体为单斜晶系,点阵参数为a=4.45A,b=5.29A,c=38.3A,β=88.7°。但X射线法难于肯定地排除它是基面原子无序排列,因而b与c都减半的9R结构,因为18R中的超结构反射强度非常弱。此外,还须区别β=90°的N18R与β(?)90°的M18R两种结构。为此,对Cu—Zn—Al合金中马氏体的结构进行了电子显微镜研究。
Generally believed that the Cu-Zn-Al alloy electron density greater than 1.454, martensite 18R and 2H two types of long-period structure of the base surface (001) atoms arranged in order to determine the initial 18R X- The martensite is monoclinic with lattice parameters of a = 4.45A, b = 5.29A, c = 38.3A, β = 88.7 °. However, the X-ray method can not safely rule out that it is a 9R structure in which basal atoms are arranged in disorder, and thus both b and c are halved since the super-structural reflection intensity in 18R is very weak. In addition, you must distinguish between the N18R with β = 90 ° and the M18R with β (?) 90 °. For this reason, the structure of martensite in Cu-Zn-Al alloy was studied by electron microscopy.