AN INVESTIGATION OF THE INTERNAL OXIDATION BEHAVIOR OF AgCu ALLOYS

J Chin Soc Corr Pro

1997, Vol. 17

Issue (4): 248-254 DOI:

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AN INVESTIGATION OF THE INTERNAL OXIDATION BEHAVIOR OF AgCu ALLOYS

PENG Xiao LI Tiefan WU Weitao(State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015)

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Abstract The internal oxidation behavior of AgCu alloys with various Cu contents at 750℃ and 850℃ was studied by means of TGA, OM, SEM and HREM. After 12h oxidation of the alloys, it was found that, all Cu was precipitated as CuO particles for Ag-0.8at%Cu but not for Ag-3.3at%Cu and Ag-6.3at%Cu alloys, and CuO particles were precipitated homogeneously in the surface of samples of the above three alloys. The exception was the alloys with Cu contents more than 9.5%, in the surface of which appeared some protrusions containing a great deal of CuO particle clusters. The metallograph of cross sections of internally oxidized samples showed that the nucleation and growth of CuO precipitation varied with the Cu contents. The number of CuO particles precipitated per unit volume decreased with the advance of internal oxidation for Ag-0.8at%Cu, Ag-3.3at%Cu at 750℃ and Ag-0.8at%Cu at 850℃ but not for the other alloys. A certain degree of Stacking Fault Tetrahedron (SFT), which was believed to be a vacancy-type fault formed by the "Kirkendall" vacancies created during internal oxidation process was observed in alloys by HREM at atomic level. It was believed that the SFT produced in internal oxidation front might promote the diffusion of Cu as the nucleation for CuO precipitation. Meanwhile, methods for homogeneous precipitation of CuO particles in internally oxidized AgCu alloys were proposed.

Key words: AgCu alloys Internal oxidation Vacancy-type stacking fault tetrahedron Nucleation

Received: 25 August 1997

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PENG Xiao LI Tiefan WU Weitao(State Key Laboratory for Corrosion and Protection; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang 110015). AN INVESTIGATION OF THE INTERNAL OXIDATION BEHAVIOR OF AgCu ALLOYS. J Chin Soc Corr Pro, 1997, 17(4): 248-254.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I4/248

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