【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
【机 构】
：
School of Materials Science and Engineering,Department of Powder Metallurgy
论文部分内容阅读
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,α2,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 ℃.
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