Interdiffusion And Reaction Between Pure Magnesium And Aluminum Alloy 6061

Keywords

AA6061; Electron microscopy; Interdiffusion; Magnesium; Reaction

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, ß-Mg2Al3, and the elusive e-phase. Similarly, the average effective interdiffusion coefficients of major constituents were calculated for Mg(ss), γ- Mg17Al12, ß-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 ß-Mg2Al3 while the activation energy for interdiffusion of ?-Mg17Al12 was only slightly higher than that for ß-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.

Publication Date

1-1-2015

Publication Title

Defect and Diffusion Forum

Volume

364

Number of Pages

174-181

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.4028/www.scientific.net/DDF.364.174

Socpus ID

84978245109 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84978245109

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