(河北工业大学 材料科学与工程学院,天津 300130)
摘 要: 利用X射线衍射仪、 透射电镜、 扫描电镜、 原子力显微镜等研究了Cu-18Al-9Mn-3.4Zn(摩尔分数, %)形状记忆合金的马氏体晶体结构、 亚结构以及马氏体相变宏观形状应变特征。 结果表明: 该合金的马氏体晶体结构为18R结构, 亚结构为层错; 单变体马氏体表面浮凸呈 “ ”型, 浮凸高度为400~500 nm , 浮凸宽度为2 000~2 400 nm; 多变体马氏体表面浮凸呈“N”型和“山尖”型, 浮凸高度为200~400 nm, 浮凸宽度为1 000~1 800 nm; 浮凸角均为8°~12°; 马氏体相变符合G-T模型的双切变特征, 惯习面为(113)面。
关键字: 原子力显微镜; 表面浮凸; 浮凸角; G-T模型; 惯习面
( School of Materials Science and Engineering,
Hebei University of Technology,Tianjin 300130, China)
Abstract: crystal structure, substructure and macroscopic lattice deformation of martensite in Cu-18Al-9Mn-3.4Zn(mole fraction, %) were studied by means of X-ray, TEM, SEM and AFM. The results show that the tested alloy has 18R structure and stacking fault substructure. “ ”-shape surface relief is found in single variants. The height of single relief is 400-500 nm and the width is 2 000-2 400 nm; Meanwhile, “N”-shape and “hill”-shape surface relief are found in various variants. The high of these relief is 200-400 nm and the width is 1 000-1 800 nm. The relief angle is 8°-12° both in single and various variant. Martensite transformation according with the character of double-shear in G-T modal and (113) habit planes was testified.
Key words: AFM; surface relief; relief angle; G-T modal; habit plane