Interdiffusion and Reaction between Pure Magnesium and Aluminum Alloy 6061

Abstract:

Using solid-to-solid couples investigation, this study characterized the reaction products evolved and quantified the diffusion kinetics when pure Mg bonded to AA6061 is subjected to thermal treatment at 300°C for 720 hours, 350°C for 360 hours, and 400°C for 240 hours. Characterization techniques include optical microscopy, scanning electron microscopy with X-ray energy dispersive spectroscopy, and transmission electron microscopy. Parabolic growth constants were determined for γ-Mg₁₇Al₁₂, β-Mg₂Al₃, and the elusive ε-phase. Similarly, the average effective interdiffusion coefficients of major constituents were calculated for Mg (ss), γ-Mg₁₇Al₁₂, β-Mg₂Al₃, and AA6061. The activation energies and pre-exponential factors for both parabolic growth constant and average effective interdiffusion coefficients were computed using the Arrhenius relationship. The activation energy for growth of γ-Mg₁₇Al₁₂ was significantly higher than that for β-Mg₂Al₃ while the activation energy for interdiffusion of γ-Mg₁₇Al₁₂ was only slightly higher than that for β-Mg₂Al₃. Comparisons are made between the results of this study and those of diffusion studies between pure Mg and pure Al [1] to examine the influence of alloying additions in AA6061.

• Periodical: Defect and Diffusion Forum (Volume 364)
• Pages: 174-181
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.364.174
• Online since: June 2015
• Authors: C.C. Kammerer*, M. Fu, Le Zhou, Dennis D. Keiser, Yong Ho Sohn
• Keywords: AA6061, Electron Microscopy, Interdiffusion, Magnesium, Reaction

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