(1. 西安西工大超晶科技发展有限责任公司，西安 710016；
2. 西北工业大学 凝固技术国家重点实验室，西安 710072)
摘 要: 采用X射线透射成像仪(XRT)、光学显微镜(OM)、扫描电镜(SEM)和能谱分析(EDS)等手段对某高钼含量β型钛合金的偏析行为进行研究。结果表明：合金铸锭及其轧制棒材1/2半径至中心区域在X射线透射检测及低倍检查时发现的灰黑色偏析斑点为α斑点；能谱分析(EDS)显示，该灰黑色偏析斑点为Mo元素贫化区域；在光学显微镜下观察固溶处理后的棒材，其正常区域组织为单相β晶粒，而灰黑色偏析斑点区域聚集着大量未转变的细小α相颗粒，其在低倍观察时呈现灰黑色。
关键字: 钛合金；偏析行为；热处理；显微组织
（1. Xi’an Super Crystal Sci-Tech Development Co., Ltd., Xi’an 710016, China;
2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:The radiographic test, OM, SEM and EDS were adopted to study the segregation behavior of the β titanium alloy which possesses high molybdenum content. The results show that, the black spots in the ingot and rolling bar from 1/2 radius to the central regions are α flecks. The EDS results shows that the α flecks are lack of Mo element. The standard microstructure of the rolling bar after solution heat treatment is single β phase. A lot of unchanged fine α phase particles gather in the grey black segregation zone, so, the spot shows grey black under low magnification inspection.
Key words: titanium alloy; segregation behavior; heat treatment; microstructure
