[Kovove materialy - Metallic materials]
    Fri - April 12, 2024 - 23:10 No. of hits : 1740513 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 57 (2019), Issue 2

Cr cluster characterization in Cu-Cr-Zr alloy after ECAP processing and aging using SANS and HAADF-STEM
ABIB, K., AZZEDDINE, H., ALILI, B., LITYŃSKA-DOBRZYŃSKA, L., HELBERT, A. L., BAUDIN, T., JEGOU, P., MATHON, M. H., ZIEBA, P., BRADAI, D.
vol. 57 (2019), no. 2, pp. 121 - 129
DOI: 10.4149/km_2019_2_121

Abstract
The precipitation of nano-sized Cr clusters was investigated in a commercial Cu-1Cr-0.1Zr (wt.%) alloy processed by equal-channel angular pressing and subsequent aging at 550 °C for 4 h using Small-Angle Neutron Scattering (SANS) measurements and High-Angle Annular Dark-Field-Scanning Transmission Electron Microscopy (HAADF-STEM). The size and volume fraction of the nano-sized Cr clusters were estimated using both techniques. The parameter values assessed by SANS (d ∼ 3.2 nm, Fv ~ 1.1 %) agreed reasonably with those by HAADF-STEM (d ∼ 2.5 nm, Fv ∼ 2.3 %). In addition to the nano-sized Cr clusters, HAADF-STEM indicated the presence of rare cuboid and spheroid sub-micronic Cr particles measuring approximately 380–620 nm in mean size. Both techniques did not evidence the presence of intermetallic CuxZrz phases within the aging conditions.

Key words
Cr-cluster, precipitation, ECAP, Cu-Cr-Zr alloy, SANS, HAADF-STEM

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
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