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Microstructural Effects on Damage Nucleation in Shock-Loaded Polycrystalline Copper

Journal Article · · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
 [1];  [2];  [2];  [2];  [2];  [3];  [4];  [4];  [4];  [4];  [4];  [4];  [5]
  1. Arizona State Univ., Tempe, AZ (United States). Ira A. Fulton Schools of Engineering; Arizona State University
  2. Arizona State Univ., Tempe, AZ (United States). Ira A. Fulton Schools of Engineering
  3. Sichuan Univ., Chengdu (China). Peac Inst. of Multiscale Sciences
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
Polycrystalline copper samples with varying thermomechanical histories were shock loaded to induce spall via laser-driven plate impacts at low shock stress (<6 GPa). Electron backscattering diffraction was used to obtain statistics on grain boundary (GB) misorientations within the spall plane and at all GBs that contained damage. Specimens with pre-existing plastic deformation showed dominant intergranular damage at boundaries in the 25 to 50 deg misorientation range, while heat-treated samples had mixed trans- and intergranular damage with a lessened disorientation influence at damaged GBs. 3-D X-ray tomography data were used to analyze global volume statistics and qualitatively inspect the shape of voids present in samples of varying thermomechanical histories. It was found that annealed samples had a mixed mode of spherical and sheet-like voids, indicative of trans- and intergranular damage, respectively, and the microstructure with the highest number of Σ3 twin boundaries had the highest concentration of spherical voids. Data from a plastically pre-strained sample showed a dominance of needle- and sheet-like voids, indicating primarily intergranular damage due to the higher strength of the bulk material forcing the damage to nucleate at weaker defects, in this case GBs.
Research Organization:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002005
OSTI ID:
1460718
Alternate ID(s):
OSTI ID: 1237955
Report Number(s):
DOE-ASU--02005-5; PII: 2482
Journal Information:
Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 10 Vol. 46; ISSN 1073-5623
Publisher:
ASM InternationalCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

The void nucleation mechanism within lead phase during spallation of leaded brass journal April 2018
Fracture mechanisms of spinodal alloys journal August 2018
3-D characterization of incipient spallation response in cylindrical copper under sweeping detonation journal March 2017

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