Impurity Diffusion Coefficients of Al and Zn in Mg Determined from Solid-to-Solid Diffusion Couples

Technical Report · Thu Aug 01 04:00:00 EDT 2013

DOI:https://doi.org/10.2172/1095717· OSTI ID:1095717

Kammerer, Catherine ^[1]; Kulkarni, Nagraj S. ^[2]; Warmack, Robert J. Bruce ^[3]; Perry, Kelly A. ^[2]; Belova, Irina ^[4]; Murch, Graeme ^[4]; Sohn, Yongho ^[1]

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1. Univ. of Central Florida, Orlando, FL (United States)
2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
3. ORNLOak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
4. University of Newcastle, NSW (Australia)

Increasing use and development of lightweight Mgalloys have led to the desire for more fundamental research in and understanding of Mg-based systems. As property enhancing components, Al and Zn are two of the most important and common alloying elements for Mg-alloys. We have investigated the concentration dependent interdiffusion of Al and Zn in Mg using diffusion couples of pure polycrystalline Mg mated to Mg solid solutions containing either <9 at.% Al or <3 at.% Zn. Concentration profiles were determined by electron micro-probe microanalysis of the diffusion zone. The interdiffusion coefficients were determined by the classical Boltzmann-Matano method within the Mg solid solution. As the concentration of Al or Zn approaches the dilute ends, we employ an analytical approach based on the Hall method to estimate the impurity diffusion coefficients. Results of Al and Zn impurity diffusion in Mg are reported and compared to published impurity diffusion coefficients typically determined by thin film techniques.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE); USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1095717
• Report Number(s): ORNL/TM--2013/328; VT0505000; CEVT024
• Country of Publication: United States
• Language: English

Related Subjects

Aluminum
Boltzman
Diffusion
Diffusion Couple
Hall
Impurity Diffusion
Magnesium
Matano
Microprobe
Nuclear Criticality Safety Program (NCSP)
Zinc