(表面物理与化学国家重点实验室，绵阳 621907)
摘 要: 采用扫描电子显微镜(SEM)和透射电子显微镜(TEM)分析钒合金在退火前后的微观组织结构。研究表明：铸态合金基体的晶格常数为0.293 8~0.294 3 nm，与纯V相比，晶格收缩了约2.8%，晶内主要析出相为盘状，该相为复杂FCC结构的富Ti型Ti-CNO相，晶格常数为0.423 4~0.428 8 nm，厚度约100 nm，其它两维尺寸达1~2 mm，在晶界上则呈网状连续分布；合金中存在大量位错。约1 000 ℃，1 h退火后，合金基体晶格有所膨胀；组织发生了变化，出现了新的方形第二相，尺寸约为500 nm，原先晶内普遍存在的盘状第二相的尺寸减小。
关键字: 钒合金；微观结构；第二相
（National Key Laboratory for Surface Physics and Chemistry, Mianyang 621907, China）
Abstract:The microstructures of vanadium alloys before and after annealing were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results show that the lattice parameter of the as-cast alloy is 0.293 8−0.294 3 nm and the shrinking ratio is 2.8% compared with the pure vanadium. The main precipitation in the bulk grains is the complex Ti rich Ti-CNO phase, which has a plate shape with the width of about 100 nm and the other two dimensions reach up to 1−2 m. The crystal structure is FCC and the lattice parameter is 0.423 4−0.428 8 nm, while this type precipitation at the grain boundaries forms continuous films. There are amount of dislocation in the ingot. After annealed at 1 000 ℃ for 1 h, the microstructure is changed. The crystal lattice of alloy has expanded and there is a new type of precipitation, which has a square shape and the size is about 500 nm. The size of plate shape precipitation is reduced.
Key words: vanadium alloy; microstructure; second phase
