Crystal plasticity study of monocrystalline stochastic honeycombs under in-plane compression

Duancheng Ma, Philip Eisenlohr, Eike Epler, Cynthia A. Volkert, Pratheek Shanthraj, Martin Diehl, Franz Roters, Dierk Raabe

Research output: Contribution to journalArticle

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Abstract

We present a study on the plastic deformation of single crystalline stochastic honeycombs under in-plane compression using a crystal plasticity constitutive description for face-centered cubic (fcc) materials, focusing on the very early stage of plastic deformation, and identifying the interplay between the crystallographic orientation and the cellular structure during plastic deformation. We observe that despite the stochastic structure, surprisingly, the slip system activations in the honeycombs are almost identical to their corresponding bulk single crystals at the early stage of the plastic deformation. On the other hand, however, the yield stresses of the honeycombs are nearly independent of their crystallographic orientations. Similar mechanical response is found in compression testing of nanoporous gold micro-pillars aligned with various crystallographic orientations. The macroscopic stress tensors of the honeycombs show the same anisotropy as their respective bulk single crystals. Locally, however, there is an appreciable fluctuation in the local stresses, which are even larger than for polycrystals. This explains why the Taylor/Schmid factor associated with the crystallographic orientation is less useful to estimate the yield stresses of the honeycombs than the bulk single crystals and polycrystals, and why the plastic deformation occurs at smaller strains in the honeycombs than their corresponding bulk single crystals. Besides these findings, the observations of the crystallographic reorientation suggest that conventional orientation analysis tools, such as inverse pole figure and related tools, would in general fail to study the plastic deformation mechanism of monocrystalline cellular materials.

LanguageEnglish (US)
Pages796-808
Number of pages13
JournalActa Materialia
Volume103
DOIs
StatePublished - Jan 15 2016

Profile

Plasticity
Plastic deformation
Crystals
Single crystals
Polycrystals
Yield stress
Compression testing
Gold
Tensors
Poles
Compaction
Anisotropy
Chemical activation
Crystalline materials

Keywords

  • Cellular material
  • Crystal plasticity
  • Crystallographic orientation
  • Honeycomb
  • Nanoporous gold

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

Cite this

Ma, D., Eisenlohr, P., Epler, E., Volkert, C. A., Shanthraj, P., Diehl, M., ... Raabe, D. (2016). Crystal plasticity study of monocrystalline stochastic honeycombs under in-plane compression. Acta Materialia, 103, 796-808. DOI: 10.1016/j.actamat.2015.11.016

Crystal plasticity study of monocrystalline stochastic honeycombs under in-plane compression. / Ma, Duancheng; Eisenlohr, Philip; Epler, Eike; Volkert, Cynthia A.; Shanthraj, Pratheek; Diehl, Martin; Roters, Franz; Raabe, Dierk.

In: Acta Materialia, Vol. 103, 15.01.2016, p. 796-808.

Research output: Contribution to journalArticle

Ma, D, Eisenlohr, P, Epler, E, Volkert, CA, Shanthraj, P, Diehl, M, Roters, F & Raabe, D 2016, 'Crystal plasticity study of monocrystalline stochastic honeycombs under in-plane compression' Acta Materialia, vol 103, pp. 796-808. DOI: 10.1016/j.actamat.2015.11.016
Ma D, Eisenlohr P, Epler E, Volkert CA, Shanthraj P, Diehl M et al. Crystal plasticity study of monocrystalline stochastic honeycombs under in-plane compression. Acta Materialia. 2016 Jan 15;103:796-808. Available from, DOI: 10.1016/j.actamat.2015.11.016
Ma, Duancheng ; Eisenlohr, Philip ; Epler, Eike ; Volkert, Cynthia A. ; Shanthraj, Pratheek ; Diehl, Martin ; Roters, Franz ; Raabe, Dierk. / Crystal plasticity study of monocrystalline stochastic honeycombs under in-plane compression. In: Acta Materialia. 2016 ; Vol. 103. pp. 796-808
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