【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400~500nm,浮凸宽度为2000~2400nm;多变体马氏体表面浮凸呈“N”型和“山尖”型,浮凸高度为200~400nm,浮凸宽度为1000~1800nm;浮凸角均为8°~12°;马氏体相变符合GT模型的双切变特征,惯习面为(113)面。更多还原

【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 400500 nm and the width is 2 0002 400 nm; Meanwhile, "N"-shape and "hill"-shape surface relief are found in various variants. The high of these relief is 200400 nm and the width is 1 0001 800 nm. The relief angle is 8°12° both in single and various variant. Martensite transformation according with the character of double-shear in GT modal and (113) habit planes was testified.更多还原