Transmission Electron Microscopy and Nano‐Precipitation

Abstract

We have presented here a rapid survey of some of the stringent results obtained by TEM and associated techniques in the precipitation studies conducted during the CPR ‘Précipitation'. It clearly appears that TEM plays an irreplaceable role in the link between the understanding of the structure and chemistry of small precipitates and the modelling of the precipitation kinetics.

Precipitation of niobium carbonitrides in ferrite: chemical composition measurements and thermodynamic modelling

“…Further TEM observations on thin foils after 30 min at 650 C confirm unambiguously the homogenous and heterogeneous (i.e. on dislocations) precipitation of nitrides and carbonitrides, respectively [21]. A consistent thermodynamic modelling of the proposed scenario will be developed in the following section.…”

Global Techniques for Characterizing Phase Transformations – A Tutorial Review

“…Labels and stand for states H þ 4 h at 140 8C and H þ 2 h at 240 8C, for which TEM analysis has been performed (see Figure 10). 2 See appendix Appendix D. 3 See appendix Appendix A. 4 See appendix Appendix E. As ithas been seen in Section 2, TEP is very sensitive to many microstructural evolutions that may occur during tempering.…”

“…1, the introductory book of Murphy [2] and a more specific paper dedicated to precipitation [3] ). Another rising technique is the tomographic atom probe (TAP), which gives access to the nature and position of REVIEW Fig.…”

Concurrent substitutional and displacive phase transformations in Al-Mg-Si nanoclusters

“…16 Enrichment with solute atoms and growth follow, whereby more and more Al atoms in the nanocluster are replaced with Mg and Si atoms and whereby the nanoclusters grow from spheres into needles. [4][5][6][16][17][18] The first evidence of ordering is the skeleton of Si-Si columns that is formed in the initial ␤Љ phase 6 and occurs approximately at the composition Mg 2 Si 2 Al 7 . Such Si 2 columns are indicated in Fig.…”