缓冷和快冷条件下Ti-55合金中稀土相的凝固特征  

Solidified characterization of rare rarth rich phase in slowly and rapidly cooled Ti-55 alloy

作　　者：李阁平[1] 李东[1] 刘羽寅[1] 王青江[1] 关少轩[1] 

机构地区：[1]中国科学院金属研究所,沈阳110015

出　　处：《中国有色金属学报》1999年第4期683-687,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金!资助项目59601010 ;中国博士后科学基金!资助项目LRZ951010

摘　　要：Ｔｉ５５ 高温钛合金在缓冷（１０００ ｋｇ 铸锭冒口） 条件下， 正常凝固区中稀土相呈弥散分布状态，初始补缩区中稀土相聚集成团， 正常补缩区中稀土相颗粒沿平行于凝固界面方向规则排列； 在快冷（ 锤砧薄片） 条件下， 稀土相除弥散分布在合金中外， 出现稀土相颗粒排列成行的现象。两种凝固条件下均出现颗粒规则排列现象的原因是凝固界面的平面长大。The solidifies characterization of rare earth rich phase in slowly and rapidly cooled Ti 55 alloy was observed and analyzed. After the ingot of Ti 55 alloy solidifies slowly, the rare earth rich phase particles are uniformly distributed in the coarse dendritical matrix within normal solidification zone. However, for the shrinkage area, lots of aggregated particles appear in the initial shrinkage zone, in addition, the particles in the normal shrinkage zone formed bands and are aligned parallel to the advancing solidification front. Rapid solidification produces fine rare earth rich phase particles, of which some particles are uniformly distributed in the α Ti matrix, others are lined up to be rows of band. The reason for the formation of the band both in the ingot riser area and in the rapid solidification flakes is that the advancing liquid solid interface remains planar.

关 键 词：稀土相 凝固特征 缓冷 快冷 钛合金 

分 类 号：TG146.23[一般工业技术—材料科学与工程]