From micro- to macroplasticity

Stefan Brandstetter, Helena Van Swygenhoven, Steven Van Petegem, Bernd Schmitt, Robert Maaß, Peter M. Derlet

Research output: Contribution to journalArticlepeer-review


In situ X-ray peak profile analysis performed during mechanical testing of metals to show that different strain hardening mechanisms in the micro and macro plastic regimes are evident were investigated. The amount of strain assigned to macroplasticity can significantly exceed the usual 0.2% definition of the macroscopic yield stress when grain size reached the nanometer range, using the X-ray diffraction spectra (XRD). The loading and unloading cycles were performed with utmost care at appropriately the same percentage of the maximum flow stress of both materials. It was observed that by comparing the stress-strain curves and the behavior of the peak width of ED-Ni, the strain hardening can be related to two clearly distinguishable behaviors of the peak width. The VFWHM behavior also indicated two distinct hardening regimes, the first characterized by a constant FWHM upon unloading, and the second by an increase relative to the as-prepared state.

Original languageEnglish (US)
Pages (from-to)1545-1548
Number of pages4
JournalAdvanced Materials
Issue number12
StatePublished - Jun 19 2006
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


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