Prediction and observation of crack tip microstructure in shape memory CuAlNi single crystals

G. M. Vasko, P. H. Leo, T. W. Shield

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The formation of martensite at a notch tip in a CuAlNi shape memory alloy loaded in tension is studied. The geometry of the initial martensite plate to form at the notch is predicted theoretically, using the stress field at a crack tip in an anisotropic linearly elastic body together with a listing of all possible austenite-martensite interfaces from the Crystallographic Theory of Martensite (CTM). The stress field and CTM analyses are combined through a selection criterion based on computing the work available from the stress field to transform to each austenite-martensite interface. The resulting predictions are compared to experimentally observed microstructures in notched specimens of single crystal CuAlNi loaded in tension for eight notch orientations. Results show that the available work criterion accurately predicts the orientation, number and order of the austenite-martensite interfaces that initially form near a crack.

Original languageEnglish (US)
Pages (from-to)1843-1867
Number of pages25
JournalJournal of the Mechanics and Physics of Solids
Volume50
Issue number9
DOIs
StatePublished - Sep 2002

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crack tips
martensite
Shape memory effect
Martensite
Crack tips
Single crystals
microstructure
Microstructure
single crystals
predictions
notches
austenite
Austenite
stress distribution
elastic bodies
shape memory alloys
cracks
Cracks
Geometry
geometry

Keywords

  • A: Fracture mechanics
  • Fracture
  • Microstructures
  • Single crystal

Cite this

Prediction and observation of crack tip microstructure in shape memory CuAlNi single crystals. / Vasko, G. M.; Leo, P. H.; Shield, T. W.

In: Journal of the Mechanics and Physics of Solids, Vol. 50, No. 9, 09.2002, p. 1843-1867.

Research output: Contribution to journalArticle

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