Comparison between SANS and APT measurements in a thermally aged Fe-19 at.%Cr alloy

Abstract

A B S T R A C Tα′ precipitation in a Fe-19 at.%Cr alloy aged at 500°C up to 2008 h has been characterized by both APT and SANS. This paper shows that when using an appropriate method for SANS data treatment, both APT and SANS yield consistent results regarding not only volume fraction and size but also α and α′ composition. Good agreement is achieved when α′ particles are considered as magnetic scattering features at the early stage of the kinetics.

Metrology of small particles and solute clusters by atom probe tomography

“…6 the apparent size of the particles as a function of their real size as reported by experimental studies using both SAXS or SANS and APT. The crosses correspond to data from recent literature [41][42][43][44][45][46][47][48][49][50][51] covering a range of alloy systems, including maraging steels, Fe-Cu alloys, ODS-steels, Al-based alloys. We simply plot the values reported in tables or graphs.…”

“…In addition to the data points from Fig. 3, we have extracted data from recent literature as crosses [41][42][43][44][45][46][47][48][49][50][51]. The symbols outside the axis correspond to clusters in Al-Mg-Si alloys where SAS sizes are unavailable but they are expected to be very small.…”

Precipitation kinetics in metallic alloys: Experiments and modeling

“…However, precipitates larger than 10-50 nm become more difficult to characterize by this technique due to the very small scattering angles involved. Some information on the chemistry of the precipitates can be obtained using contrast variation methods, such as comparing nuclear and magnetic SANS [33], combining SAXS and SANS [34][35][36] or changing the X-ray energy close to an absorption edge (anomalous SAXS or ASAXS) [37,38]. Limitations of SAS include the impossibility to discriminate between precipitates of different crystal structure, of simultaneously determining the precipitate morphology and size distribution, and the impossibility to determine simultaneously the precipitate chemistry and volume fraction.…”

A comparative study of Fe-Cr unmixing using differential scanning calorimetry and small-angle scattering

“…Due to its very large impact on the industrial use of stainless steels, this Fe-Cr decomposition has been extensively studied over the past decades. Experimental characterization of the degree of unmixing has been mainly carried out using Atom Probe Tomography (APT) [2,4,[6][7][8][9][10][11][12][13][14][15] and Small-Angle Scattering (using neutrons or X-rays, respectively SANS and SAXS) [16][17][18][19][20][21][22][23][24][25]. These experimental data have extensively served as a basis for establishing the validity of physically-based models, most often using Kinetic Monte Carlo modelling, and for establishing the link between the degree of unmixing and the evolution of mechanical properties [2,4,9,15,24,[26][27][28][29][30].…”