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

Kammerer, Catherine¹  Kulkarni, Nagraj S²  Warmack, Robert J Bruce²  Perry, Kelly A²  Belova, Irina³  Murch, Prof. Graeme⁴ 

[1] University of Central Florida, Orlando;ORNL;University of Newcastle, NSW, Australia;University of Newcastle, NSW, Aus

关键词: diffusion;    diffusion couple;    magnesium;    aluminum;    zinc;    impurity diffusion;    microprobe;    Hall;    Boltzman;    Matano;   

DOI  :  10.2172/1095717
RP-ID  :  ORNL/TM-2013/328
PID  :  OSTI ID: 1095717
Others  :  Other: VT0505000
Others  :  CEVT024

美国|英语

来源: SciTech Connect

【 摘 要 】

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.