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Title: Dynamic tensile deformation and damage of B 4C-reinforced Al composites: Time-resolved imaging with synchrotron x-rays

Dynamic tensile experiments are conducted on 15% and 30% in weight percentage B 4C/Al composites with a split Hopkinson tension bar, along with high-speed synchrotron x-ray digital image correlation (XDIC) to map strain fields at μ m and μ s scales. As manifested by bulk-scale stress – strain curves, a higher particle content leads to a higher yield strength but lower ductility. Strain field mapping by XDIC demonstrates that tension deformation and tensile fracture, as opposed to shear and shear failure, dominate deformation and failure of the composites. The fractographs of recovered samples show consistent features. The particle-matrix interfaces are nucleation sites for strain localizations, and their propagation and coalescence are diffused by the Al matrix. The reduced spacing between strain localization sites with increasing particle content, facilitates their coalescence and leads to decreased ductility. Furthermore, designing a particle-reinforced, metallic-matrix composite with balanced strength and ductility should consider optimizing the inter-particle distance as a key par
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [5] ;  [6] ;  [6] ;  [7] ;  [8]
  1. Wuhan Univ. of Technology, Hubei (People's Republic of China); Southwest Jiaotong Univ., Sichuan (People's Republic of China); The Peac Institute of Multiscale Sciences, Sichuan (People's Republic of China)
  2. Southwest Jiaotong Univ., Sichuan (People's Republic of China); The Peac Institute of Multiscale Sciences, Sichuan (People's Republic of China); Univ. of Science and Technology of China, Anhui (People's Republic of China)
  3. China Academy of Engineering Physics, Sichuan (People's Republic of China)
  4. The Peac Institute of Multiscale Sciences, Sichuan (People's Republic of China); Univ. of Science and Technology of China, Anhui (People's Republic of China)
  5. The Peac Institute of Multiscale Sciences, Sichuan (People's Republic of China)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
  7. Wuhan Univ. of Technology, Hubei (People's Republic of China)
  8. Southwest Jiaotong Univ., Sichuan (People's Republic of China); The Peac Institute of Multiscale Sciences, Sichuan (People's Republic of China)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 664; Journal Issue: C; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; fractography; fracture; metal-matrix composites (MMCs); radiography
OSTI Identifier:
1338241
Alternate Identifier(s):
OSTI ID: 1359584