Accessible Unlicensed Requires Authentication Published by De Gruyter March 1, 2013

Phase diagram of the Co–Cu–Ti system at 850°C

Honghui Xu, Yong Du, Baiyun Huang, Zhanpeng Jin, Shitong Li and Xiang Zhang


The phase equilibria of the Co–Cu–Ti system at 850°C are investigated using a high-efficiency diffusion couple and six key ternary alloys. The samples are examined by means of optical microscopy, scanning electron microscopy, and electron probe microanalysis. At 850°C, no ternary compound is found. The Ti3Cu phase is a metastable phase. The solubilities of Cu in Ti2Co, TiCo, TiCo2(c) and TiCo3 were determined to be 8.7, 35.8, 2.1, and 5.4 at.%, respectively. And the solubilities of Co in Ti2Cu, TiCu, Ti3Cu4, and TiCu2 were measured to be 6.6, 0.7, 2.4, and 10.2 at.%, respectively. The following 9 three-phase equilibria are observed: (Ti) + Ti2Co + Ti2Cu, Ti2Co + Ti2Cu + TiCo, Ti2Cu + TiCu + TiCo, TiCu + Ti3Cu4 + TiCo, Ti3Cu4 + TiCu2 + TiCo, TiCu2 + TiCo + (Cu), TiCo + TiCo2(c) + (Cu), TiCo2(h) + TiCo3 + (Cu), and TiCo3 + (Co) + (Cu).

1 Correspondence address: Professor Dr. Yong Du, State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, P. R. China, Tel.: +867318836213, Fax: +867318710855. E-mail:


[1] K.P.Gupta: J. Phase Equilib.24(2003)272.10.1361/105497103770330640Search in Google Scholar

[2] H.U.Pfeifer, S.Bhan, K.Schubert: J. Less-Common Met.14(1968)291.10.1016/0022-5088(68)90034-9Search in Google Scholar

[3] A.V.Davydov, U.R.Kattner, D.Josell, J.E.Blendell, R.M.Waterstrat, A.J.Shapiro, W.J.Boettinger: Metall. Mater. Trans.A32(2001)2175.10.1007/s11661-001-0193-8Search in Google Scholar

[4] K.C.H.Kumar, I.Ansara, P.Wollants, L.Delaey: Z. Metallkd.87(1996)666.Search in Google Scholar

[5] P.Canale, C.Servant: Z. Metallkd.93(2002)273.Search in Google Scholar

[6] J.L.Murray, in: P. R.Subramanian, D. J.Chakrabarti, D. E.Laughlin (Eds.), Phase Diagrams of Binary Copper Alloy, ASM International, Materials Park, OH(1990)447.Search in Google Scholar

[7] T.Yamane, S.Nakajima, H.Araki, Y.Minamino, S.Saji, J.Takahashi, Y.Mijamoto: J. Mater. Sci. Lett.13(1994)162.10.1007/BF00278149Search in Google Scholar

[8] V.N.Eremenko, Y.I.Buyanov, S.B.Prima: Poroshk. Metall.20(1966)77.Search in Google Scholar

[9] J.Kubista, J.Vrest'al: J. Phase Equilib.21(2000)125.10.1361/105497100770340165Search in Google Scholar

[10] H.H.Xu, Y.Du, B.Y.Huang, S.H.Liu: J. Alloys & Comp.399(2005)92.Search in Google Scholar

Received: 2005-04-28
Accepted: 2005-08-14
Published Online: 2013-03-01
Published in Print: 2006-02-01

© 2006, Carl Hanser Verlag, München