Interdiffusion and Reaction Between Al and Zr in the Temperature Range of 425 to 475 °C

摘要: Interdiffusion and reaction between Al Zr was investigated as functions of purity, temperature, time, using versus solid-to-solid diffusion couple annealed in the temperature range from 425 °C to 475 °C. All couples were observed develop two intermetallic layers, i.e., Al3Zr Al2Zr. The phase grew with planar morphology, while Al2Zr developed a non-planar interfacial morphology. Growth rate integrated interdiffusion coefficients determined Wagner’s approach for each phase. Purity had significant effect on development phases. Diffusion low-purity (i.e., 99.2%) exhibited higher growth Al3Zr, at expense growth. Couples low purity also resulted degree non-planarity In general, increased an increase anneal it decreased temperature. Non-planar morphology simulated based 3-D anisotropic diffusivity tensor (quadric), needle-like growth, similar that by experiments simulated.