2016•稀有金属：英文版Requires access
Microstructure evolution of Ti-46Al-6Nb-（Si,B） alloys during heat treatment with W addition
Shouzhen, 。 Cao, Shulong, Xiao, Yuyong, Chen, Jing, Tian Tian, Lijuan, Xu, Xiaopeng, Wang, Jianchao, Han Han, Yi, Jia
Open publisher page 0 citations
Abstract
The cast ingots of Ti-46Al-6Nb-0.25Si-0.2B and Ti-46Al-6Nb-0.5W-0.25Si-0.2B（at%） were made by induction skull melting（ISM） technique.A series of heat treatments（HTs） were conducted to research the microstructure evolution of both alloys.Microstructure and tensile property were examined by scanning electron microscope（SEM）,X-ray diffraction（XRD）,transmission electron microscope（TEM）,and tensile testing machine.The results show that microsegregation（liquid segregation and solid segregation） is exacerbated by the addition of0.5 at%W;the addition of Nb,W in TiAl alloy makes the phase transition difficultly take place;then,the microstructures and tensile properties of both alloys are improved after certain HT processes;finally,the thicknesses of the γ/α2 lamellae after a certain HT process are significantly affected by the number of residual γ phases before the furnace-cooling moment.