Effect of V and Nb additions on microstructure,properties,and deformability of Ti-45Al-9 (V,Nb,Y) alloy  

作　　者：Yang Fei Kong Fantao Chen Yuyong Xiao Shulong 

机构地区：[1]School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China [2]Department of Powder Metallurgy. Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, China

出　　处：《China Foundry》2010年第4期357-361,共5页中国铸造（英文版）

基　　金：supported by the State Key Lab of Advanced Metals and Materials China

摘　　要：Ti-45Al-9(V, Nb, Y) alloys with four different x=V/Nb (atomic ratio x = 1, 1.5, 2 and 3.5) have been prepared, and the microstructures, properties and hot deformation behaviors were investigated. SEM, XRD and TEM results showed that Ti-45Al-9(V, Nb, Y) alloys were mainly composed of γ, α 2 , and β phase, and the volume fraction of β phase increased with the increase of the atomic ratio of V/Nb. The alloys were featured with lamellar microstructure with β and γ phases locating at the colony boundaries, and some β precipitates appearing at γ/γ interfaces. It was found that the colony size decreased with the increase of x. The alloys exhibited moderate mechanical properties at room temperature, with a yield strength of over 600 MPa, and fractures showed mainly translamellar character. The alloy with x=3.5 exhibited the best deformability at elevated temperature and that with x=1 had superior oxidation resistance at 800 ℃.Ti-45Al-9（V, Nb, Y） alloys with four different x=V/Nb （atomic ratio x = 1, 1.5, 2 and 3.5） have been prepared, and the microstructures, properties and hot deformation behaviors were investigated. SEM, XRD and TEM results showed that Ti-45Al-9（V, Nb, Y） alloys were mainly composed of γ, α 2 , and β phase, and the volume fraction of β phase increased with the increase of the atomic ratio of V/Nb. The alloys were featured with lamellar microstructure with β and γ phases locating at the colony boundaries, and some β precipitates appearing at γ/γ interfaces. It was found that the colony size decreased with the increase of x. The alloys exhibited moderate mechanical properties at room temperature, with a yield strength of over 600 MPa, and fractures showed mainly translamellar character. The alloy with x=3.5 exhibited the best deformability at elevated temperature and that with x=1 had superior oxidation resistance at 800 ℃.

关 键 词：TiAl alloy microstructure and properties hot deformation behavior oxidation 

分 类 号：TG146.23[一般工业技术—材料科学与工程]