Designing heterogeneous nano-microstructures to improve mechanical properties

Mehdi Hamid, Hao Lyu, Annie Ruimi, Hussein M. Zbib

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Grain size is one of the most important parameters affecting material strength and ductility. When a homogenized grain size model is employed (such as in the Hall-Petch model), it disregards the effects the heterogeneous nature of the microstructure (grain size spatial distribution, grain shape) may have on strength and plastic flow. In this work, we employ a multi-scale approach to study the effect of heterogeneous microstructure containing nano and micron size grains. This is based on dislocations analysis that includes discrete dislocation dynamic (DDD), continuum dislocation dynamic (CDD) and a visco-plastic self-consistent (VPSC) model. A combined strain-gradient and stress-gradient theory is implemented into the framework by means of a heterogeneous grid. Different distributions of nano-layers are imbedded into an otherwise homogenous microstructure resulting into a gradient nanomicrostructure. Several simulations of microstructures with various grain size spatial distributions and different number of nano-layers are investigated, and the results are compared to their counterpart homogenized structures.

Original languageEnglish
Title of host publicationMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
PublisherAssociation for Iron and Steel Technology, AISTECH
Pages245-252
Number of pages8
Volume1
ISBN (Electronic)9781510833142
Publication statusPublished - 2016
EventMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016 - Salt Lake City, United States
Duration: 23 Oct 201627 Oct 2016

Other

OtherMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
CountryUnited States
CitySalt Lake City
Period23/10/1627/10/16

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Keywords

  • Crystal plasticity
  • Nano- microstructure
  • Serial dislocation mechanisms

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Mechanics of Materials
  • Energy Engineering and Power Technology

Cite this

Hamid, M., Lyu, H., Ruimi, A., & Zbib, H. M. (2016). Designing heterogeneous nano-microstructures to improve mechanical properties. In Materials Science and Technology Conference and Exhibition 2016, MS and T 2016 (Vol. 1, pp. 245-252). Association for Iron and Steel Technology, AISTECH.