Journal
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
Volume 61, Issue -, Pages 92-97Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2018.02.008
Keywords
Diffusion couple; Intermetallics; Nanoindentation; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [11464001, 51531009, 51661003]
- Guangxi Natural Science Foundation [2014GXNSFAA118308]
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In this work, solid-to-solid diffusion couples were assembled and annealed to investigate diffusion behavior and mechanical properties of the Cu-Zr system in temperatures range from 1043 K to 1113 K. Six intermetallic compounds (IMCs) Cu9Zr2, Cu51Zr14, Cu8Zr3, Cu10Zr7, CuZr, and CuZr2 were observed in the diffusion zone. Composition-dependent interdiffusion coefficients of IMCs have been calculated based on the measured composition Cu profiles of the diffusion zones by using Sauer-Freise method. And the average effective interdiffusion coefficients for each phase were also calculated by using Wagner method. The activation energies of diffusion are evaluated according to the average effective interdiffusion coefficient. Finally, the load-displacement curves measured by nano-indentation are obtained to characterize mechanical properties of Cu9Zr2 and Cu51Zr14, which have similar hardness and elastic moduli.
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