Interface reactions between TiAl alloys and diacetatozirconic acid-yttria molds differentiated by ammonium metatungstate addition  

作　　者：Yong-Shuang Cui De-Bo Liu Li-Hua Chai Zi-Yong Chen 

机构地区：[1]College of Materials Science and Engineering,Beijing University of Technology,Beijing,100124,China [2]Beijing Institute of Astronautical Systems Engineering,Beijing,100076,China

出　　处：《Rare Metals》2023年第1期296-301,共6页稀有金属（英文版）

基　　金：financially supported by the Beijing Natural Science Foundation (No.2164054);the National Natural Science Foundation of China (No.51301005)。

摘　　要：Two types of diacetatozirconic acid-yttria molds which were labeled as ZYW mold(diacetatozirconic acidyttria mold with traces of ammoium metatungstate in the slurry) and ZY mold(diacetatozirconic acid-yttria mold without ammonium metatungstate) were prepared by traditional investment casting.The ZYW and ZY molds were sintered in a carbon-reducing atmosphere and in air,respectively,at 1550℃ for 4 h.Interactions between Ti-47Al-2Cr-2Nb(at%) alloys and the molds at 1650℃ for 30 min were studied.The microstructures of the metalmold interfaces and the presence of inclusions and oxygen contamination in the TiAl bulk alloy were analyzed,and the influences of ammonium metatungstate were discussed.The results indicate that WO_(3)releases O into the TiAl melt,introducing tungsten metal into the alloy matrix.The TiAl alloy ingots cast in the ZY molds had the fewest inclusions and the lowest oxygen contamination.

关 键 词：TiAl-based alloys Diacetatozirconic acidyttria molds Ammonium metatungstate INTERACTIONS 

分 类 号：TG146.23[一般工业技术—材料科学与工程]