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Phase-stress partition during uniaxial tensile loading of a TiC-particulate-reinforced Al composite

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Abstract

Using neutron diffraction, we measured during in situ loading the lattice elastic mean phase (LEMP) strains in the matrix and reinforcement of a 15 vol pct TiC-particulate-reinforced 2219 Al composite. From the strain components longitudinal to and transverse to loading, the in situ normal phase stresses (average normal stresses in the constituent phases) were obtained through Hooke’s law. The internal stress partition between the matrix and reinforcement, i.e., load sharing, can then be inferred. Internal stress development was also modeled using the finite-element method (FEM), showing good agreement with the experimental results. Both indicate that the relationship between the LEMP strains/phase stresses and the applied load noticeably deviates from linearity during composite microyielding, long before the nominal 0.2 pct proof stress is reached. The nonlinearity arises (despite the linear elastic relationship between phase stresses and LEMP strains) because the applied traction is not synonymous with the phase stresses, and the ratio of phase stresses may vary during loading. Notably, the morphology of the LEMP strain development with applied load differs in the directions parallel to or perpendicular to the load. The differences are explained by considering the evolution of local matrix plasticity. Thermal residual stresses and inelastic stress relaxation, driven by interfacial diffusion, are also discussed.

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Author notes

  1. N. Shi (Technical Staff Member, Department Scientist)

    Present address: Los Alamos National Laboratory, USA

Authors and Affiliations

  1. IBM, 95193, San Jose, CA

    N. Shi (Technical Staff Member, Department Scientist)

  2. the Los Alamos National Laboratory, 87545, Los Alamos, NM

    M. A. M. Bourke (Technical Staff Member) & J. A. Roberts (Technical Staff Member)

  3. the Scientific Research Laboratory, Ford Motor Company, 48121, Dearborn, MI

    J. E. Allison (Staff Scientist)

Authors
  1. N. Shi
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  2. M. A. M. Bourke
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  3. J. A. Roberts
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  4. J. E. Allison
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Shi, N., Bourke, M.A.M., Roberts, J.A. et al. Phase-stress partition during uniaxial tensile loading of a TiC-particulate-reinforced Al composite. Metall Mater Trans A 28, 2741–2753 (1997). https://doi.org/10.1007/s11661-997-0031-8

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  • DOI: https://doi.org/10.1007/s11661-997-0031-8

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