Interdiffusion and reaction between pure magnesium and aluminum alloy 6061

Journal Article · Mon Jun 01 00:00:00 EDT 2015 · Defect and Diffusion Forum (Online)

DOI: https://doi.org/10.4028/www.scientific.net/DDF.364.174 · OSTI ID:1363913

Kammerer, C. C. ^[1]; Fu, Mian ^[1]; Zhou, Le ^[1]; Keiser, Jr., Dennis D. ^[2]; Sohn, Yong Ho ^[1]

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1. Univ. of Central Florida, Orlando, FL (United States)
2. Idaho National Lab. (INL), Idaho Falls, ID (United States)

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. As a result, comparisons are made between the results of this study and those of diffusion studies between pure Mg and pure Al to examine the influence of alloying additions in AA6061.

• Research Organization: Idaho National Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC07-05ID14517
• OSTI ID: 1363913
• Report Number(s): INL/JOU--14-32541
• Journal Information: Defect and Diffusion Forum (Online), Journal Name: Defect and Diffusion Forum (Online) Vol. 364; ISSN 1662-9507
• Publisher: Trans Tech PublicationsCopyright Statement
• Country of Publication: United States
• Language: English