The phase equilibria in Co-V-Ta ternary system and the mechanical properties of γ”-reinforced alloys
In order to develop new Co-base superalloys and understand the relationships between microstructures and properties in the Co-V-Ta ternary system, four isothermal sections of the Co-V-Ta ternary system at 1300, 1200, 1100 and 900 ℃ are experimentally established.Importantly, the alloys with γ/γ”microstructure are obtained.The present results show that: (1)the C14 single phase region is formed at 1100 and 900 ℃, while the C36 phase forms a single region at 900 ℃;(2) the analogous occupation behaviors of V and Co atoms, substituting for each other, can be indicated in C14, C15 and C36 Laves-phases;(3) the solubility of Ta in σ-Co2V3 phase slightly increases with increasing temperature;(4) Co-V-Ta base alloys fabricated show the attractive mechanical properties.The experimental data obtained in the present work is not only essential for the thermodynamic assessment of the Co-V-Ta ternary system, but also important for the development of the Co-base alloys.
C.P.Wang J.J.Ruan S.Y.Yang T.Omori T.Yang Y.Kimura X.J.Liu R.Kainuma K.Ishida
College of Materials, Xiamen University, Xiamen, 361005 Department of Materials Science, Graduate School of Engineering Tohoku University, Japan
国内会议
桂林
英文
158-158
2015-11-03（万方平台首次上网日期，不代表论文的发表时间）