(表面物理與化學國家重點實驗室，綿陽 621907)
摘 要: 采用掃描電子顯微鏡(SEM)和透射電子顯微鏡(TEM)分析釩合金在退火前后的微觀組織結構。研究表明：鑄態(tài)合金基體的晶格常數(shù)為0.293 8~0.294 3 nm，與純V相比，晶格收縮了約2.8%，晶內主要析出相為盤狀，該相為復雜FCC結構的富Ti型Ti-CNO相，晶格常數(shù)為0.423 4~0.428 8 nm，厚度約100 nm，其它兩維尺寸達1~2 mm，在晶界上則呈網(wǎng)狀連續(xù)分布；合金中存在大量位錯。約1 000 ℃，1 h退火后，合金基體晶格有所膨脹；組織發(fā)生了變化，出現(xiàn)了新的方形第二相，尺寸約為500 nm，原先晶內普遍存在的盤狀第二相的尺寸減小。
關鍵字: 釩合金；微觀結構；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
