ASAXS study of the copper enriched precipitation in the 15-5PH alloy

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摘要：

The 15-5 PH alloy (composed of Fe, Cr, Ni and Cu), aged at 450 and 500°C has been mainly studied by anomalous small angle X-ray scattering (ASAXS), as well as by transmission electron microscopy, X-ray microanalysis and Mssbauer spectrometry. The two phase model (practically pure Cu precipitates embedded in a Cu depleted matrix) accounts for our results. From the ASAXS curves recorded at three absorption edges (Cr, Cu and Fe), the partial structure functions PSF ij (with ij = Fe , ( Cr + Ni ) and Cu ) have been determined. The ΔC Fe / ΔC (Cr+Ni) and ΔC Fe /ΔC Cu ratios calculated at each and/or both edges are in satisfactory agreement with those determined from X-ray microanalysis carried out on extraction replicas.

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关键词：

Experimental/ ageing chromium alloys copper alloys iron alloys Mossbauer spectroscopy nickel alloys precipitation transmission electron microscopy X-ray chemical analysis X-ray diffraction/ Cu enriched precipitation anomalous small angle X-ray scattering X-ray microanalysis transmission electron microscopy Mossbauer spectrometry two phase model practically pure Cu precipitates Cu depleted matrix absorption edges partial structure-functions extraction replicas Fe-Cr-Ni-Cu 450 degC 500 degC/ A8130M Precipitation A6475 Solubility, segregation, and mixing A7680 Moumlssbauer effect other gamma-ray spectroscopy in condensed matter A8140G Other heat and thermomechanical treatments / temperature 7.23E+02 K temperature 7.73E+02 K/ FeCrNiCu/ss Cr/ss Cu/ss Fe/ss Ni/ss