Correlations Between Spall Damage Mode Preference and Microstructure in Shocked Polycrystalline Copper: A 3-D X-Ray Tomography Study

Brown, A. D.; Pham, Q.; Peralta, P.; Luo, S. N.; Patterson, B. M.; Byler, D.; Koskelo, A.; Xiao, X.

doi:10.1007/s40870-015-0034-2

Title: Correlations Between Spall Damage Mode Preference and Microstructure in Shocked Polycrystalline Copper: A 3-D X-Ray Tomography Study

Journal Article · Wed Oct 28 00:00:00 EDT 2015 · Journal of Dynamic Behavior of Materials

DOI:https://doi.org/10.1007/s40870-015-0034-2· OSTI ID:1460716

Brown, A. D. ^[1]; Pham, Q. ^[2]; Peralta, P. ^[2]; Luo, S. N. ^[3]; Patterson, B. M. ^[4]; Byler, D. ^[4]; Koskelo, A. ^[4]; Xiao, X. ^[5]

Arizona State Univ., Tempe, AZ (United States). Ira A. Fulton Schools of Engineering; Univ. of New South Wales, Sydney, NSW (Australia)
Arizona State Univ., Tempe, AZ (United States). Ira A. Fulton Schools of Engineering
Peac Inst. of Multiscale Sciences, Chengdu (China)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

Nondestructive characterization techniques are essential for maximizing the amount of high fidelity data obtained from post mortem mechanically tested materials, particularly for the complex experimental techniques used for shock loading. Polycrystalline copper samples of varying thermomechanical histories were shock loaded to induce incipient spall damage conditions via plate impacts at low pressures. Electron backscattering diffraction (EBSD) and 3-D X-ray tomography (XRT) were utilized to obtain microstructural and void volume data, respectively. Voids were fit to ellipsoids using their inertia tensors obtained from the 3-D XRT data, and the results compared to EBSD data. This, in turn, enabled establishing quantitative correlations between void shapes and preferential damage mode, either inter- or trans-granular, for each thermomechanical history. Greater than 60 % of voids present in heat-treated samples were spherical, indicative of transgranular damage preference. Greater than 90 % of voids present in as-received rolled samples were flat sheetlike voids or unsymmetrical oblate ellipsoids, indicative of intergranular and coalesced damage modes. Analyzing grain boundary damage statistics in conjunction with global damage mode distributions indicate that boundaries become less dominant as preferential void nucleation sites within the spall plane as the bulk strength of the material decreases from heat treatments.

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Research Organization:: Arizona State Univ., Tempe, AZ (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002005; FG52-06NA26169; FG52-10NA29653

OSTI ID:: 1460716

Report Number(s):: DOE-ASU-02005-3; PII: 34; TRN: US1901908

Journal Information:: Journal of Dynamic Behavior of Materials, Vol. 1, Issue 4; ISSN 2199-7446

Publisher:: SpringerCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Spall
void shape
statistics
damage mode
intergranular
transgranular
Shock loading
X-ray tomography
Microstructure
Copper

Title: Correlations Between Spall Damage Mode Preference and Microstructure in Shocked Polycrystalline Copper: A 3-D X-Ray Tomography Study

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