Crystallographic orientation and spatially resolved damage in a dispersion-hardened Al alloy

Qingge Xie*, Junhe Lian, Jurij J. Sidor, Fengwei Sun, Xingchen Yan, Chaoyue Chen, Tingkun Liu, Weijian Chen, Ping Yang, Ke An, Yandong Wang

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

3 Citations (Scopus)

Abstract

The in-situ neutron diffraction technique, in combination with both the full-field crystal elasto-viscoplastic finite element model and microstructural characterization, was used to study the deformation-induced damage anisotropy in a commercial Al alloy, subjected to uniaxial tensile and cyclic loading. The simulations capture well the crystallographic-orientation-dependent lattice strain behavior. The hard grains, e.g. those orientated with the <111> and <422> orientations parallel with the uniaxial loading direction (LD), feature large Taylor factors and seem more prone to form damage-related band structures. Their effective elastic moduli decrease with the accumulation of damage, which are different from the soft grains orientated with the <200> orientation along the LD. Correlation between the distribution of voids and that of the residual lattice strain developed after failure may exist. The maximum tensile type residual lattice strain observed after failure may be resulted from the band structure formed in the hardest <111> grains. It was revealed that the band structure triggered by the hard particles could be one of sources of damage. In addition, while the specimen was obviously damaged, a fast stress relief was evidenced after unloading from the tension, especially at the beginning of unloading. Our present investigations provide a novel method for exploring the damage mechanisms of polycrystalline materials during plastic deformation.

Original languageEnglish
Pages (from-to)138-150
Number of pages13
JournalActa Materialia
Volume193
Early online date14 Apr 2020
DOIs
Publication statusPublished - Jul 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Band structure
  • Damage
  • Necking
  • Neutron diffraction
  • Residual lattice strain

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    Xie, Q., Lian, J., Sidor, J. J., Sun, F., Yan, X., Chen, C., Liu, T., Chen, W., Yang, P., An, K., & Wang, Y. (2020). Crystallographic orientation and spatially resolved damage in a dispersion-hardened Al alloy. Acta Materialia, 193, 138-150. https://doi.org/10.1016/j.actamat.2020.03.049