The coarsening behavior of the γ′ precipitate in nickel-silicon alloys
作者： P.K. Rastogi , A.J. Ardell
DOI: 10.1016/0001-6160(71)90099-X
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摘要: Abstract The coarsening kinetics of the γ′ (Ni3Si) precipitate in a binary Ni-6.5 wt. % Si alloy were investigated by magnetic technique and transmission electron microscopy. was used to determine variation content matrix as function aging time over temperature range 625–775°C. This process accurately followed t − 1 3 kinetic behavior predicted Lifshitz-Slyozov-Wagner (LSW) theory diffusion-controlled coarsening. However, after about 16 hr at 775°C, pronounced departure from observed. Transmission microscopy showed that this associated with partial loss coherency precipitates. particle growth determined 775°C dark-field microscopy, size distributions. Prior becoming semicoherent, average increased , agreement LSW theory. experimentally histograms agreed theoretical 5 aging. Quantitative analysis our data, combined other data literature, yielded reasonable values for interfacial free energy γ′-matrix interface (between 10 13 erg/cm2). diffusion coefficient obtained an order magnitude larger than independently diffusivities dilute Ni-Si aloys. application equations under conditions volume constrained coherent precipitates “effective” coefficients extremely well those experimentally.
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