The complexity of non-Schmid behavior in the CuZnAl shape memory alloy

S. Alkan, A. Ojha, H. Sehitoglu

Research output: Contribution to journalArticlepeer-review

Abstract

The paper addresses one of the most important yet overlooked phenomenon in shape memory research- the plastic slip response. We show that the slip response is highly crystal orientation dependent and we demonstrate the precise reasons behind such complex response. The fractional dislocations on <111> {112} or <111> {011} systems can be activated depending on the sample orientation and solutions are derived for the variations in disregistries and dislocation core spreadings. This leads to the calculation of critical resolved shear stress in close agreement with experimental trends. The results show considerable dependence of the flow behavior on the non-Schmid stress components and the proposed yield criterion captures the role of stress tensor components.

Original languageEnglish (US)
Pages (from-to)238-257
Number of pages20
JournalJournal of the Mechanics and Physics of Solids
Volume114
DOIs
StatePublished - May 2018

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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