Journal Article

PUBDB-2025-02341

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Defect-driven relaxation of nanostructured Cu examined by in situ heating high-energy synchrotron X-ray microbeam diffraction

Lee, I. ; Bhatta, L. ; Xu, D. ; Blankenburg, M.Extern*DESY* ; Lienert, U.DESY* ; Liss, K.-D. (Corresponding author)Extern* ; Kawasaki, M. (Corresponding author)Extern*

2025
Elsevier Lausanne

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Please use a persistent id in citations: doi:10.1016/j.jallcom.2025.180599  doi:10.3204/PUBDB-2025-02341

Abstract: Bulk nanostructured metals introduced by severe plastic deformation contain an excess of lattice defects. A nanostructured copper (Cu) processed by a high-pressure torsion technique was examined during in situ heating to investigate microstructural relaxation and quantify the evolution of microstructural parameters using high- energy synchrotron microbeam X-ray diffraction. While general microstructural relaxations, such as recovery, recrystallization, and subsequent grain growth, were observed, the key microstructural parameters, including grain size, microstrain, dislocation density, and thermal expansion coefficient, and their changes at critical temperatures were uniquely described and quantified through diffraction data. Based on this analysis, the stored energies driving thermally activated microstructural changes were estimated for individual defect types — grain boundaries, dislocations, and vacancies — that are expected to significantly influence the relaxation behavior of nanostructured Cu. This study demonstrates the effectiveness of diffraction characterization techniques for gaining a comprehensive understanding of the thermal stability of bulk nanostructured materials.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Experimentebetreuung PETRA III (FS-PET-D)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20200639 (I-20200639) (I-20200639)

Experiment(s):

1. PETRA Beamline P21.2 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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