Modeling the effects of stress state and crystal orientation on the stress-induced transformation of NiTi single crystals

Journal Article · Mon Oct 31 23:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02648858· OSTI ID:6896732

Buchheit, T E; Wert, J A ^[1]

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1. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering

A model that combines the phenomenological theory of martensite with a generalized Schmid's law has been used to predict the principal stress combinations required to induce the martensitic transformation in unconstrained NiTi shape memory alloy (SMA) single crystals. The transformation surfaces prescribed by the model are anisotropic and asymmetric, reflecting the unidirectional character of shear on individual martensite habit planes. Model predictions of the transformation strain as a function of stress axis orientation for uniaxial applied stress further demonstrate the anisotropy of the stress-induced transformation in NiTi single crystals. Model results for the uniaxial stress case compare favorably with previously published experimental observations for aged NiTi single crystals.

• OSTI ID: 6896732
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 25:11; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALLOGRAPHY
DATA
INFORMATION
INTERMETALLIC COMPOUNDS
MATHEMATICAL MODELS
NICKEL ALLOYS
NUMERICAL DATA
PHASE TRANSFORMATIONS
SHAPE MEMORY EFFECT
THEORETICAL DATA
TITANIUM ALLOYS