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The effect of microstructure on the relationship between grain boundary sliding and slip transmission in high purity aluminum

Journal Article · · International Journal of Plasticity
 [1];  [2];  [3]
  1. Univ. of Michigan, Ann Arbor, MI (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); michigan state university
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Univ. of California, Santa Barbara, CA (United States)
The relationship between grain boundary sliding (GBS) and slip transmission is investigated experimentally at grain boundaries in 99.99% aluminum with a through-thickness, coarse grained microstructure deformed in tension at 190 °C. Using scanning electron microscope enabled digital image correlation (SEM-DIC) and electron backscatter diffraction (EBSD), high resolution strain fields and microstructural information were measured to examine the influence of microstructural neighborhoods on interactions between GBS and slip transmission and strain localization. Several distinct cases are presented that highlight important microstructural factors that govern deformation near grain boundaries. The findings include (1) direct transmission and GBS were anti-compatible and facilitated by opposing boundary types (low misorientation and high energy grain boundaries respectively); (2) increased GBS activity was correlated with decreased indirect transmission behavior; (3) GBS accommodation at triple junctions was enabled by intragranular plasticity; and (4) the local intragranular plastic strain discontinuity between grains determined the magnitude of GBS gradients. Finally, this work provides insight into the nature of these mechanisms and can be used to identify strain transfer criteria that can lead to improved GBS-sensitive crystal plasticity models.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC52-07NA27344; SC0001525; SC0013971; SC0014281
OSTI ID:
1770876
Alternate ID(s):
OSTI ID: 1820012
OSTI ID: 1664440
Report Number(s):
LLNL-JRNL--793893
Journal Information:
International Journal of Plasticity, Journal Name: International Journal of Plasticity Vol. 135; ISSN 0749-6419
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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