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Measurement of the lattice plane strain and phase fraction evolution during heating and cooling in shape memory NiTi

Authors :
Santo Padula
Raj Vaidyanathan
R.D. Noebe
Vinu Krishnan
Bjørn Clausen
Donald W. Brown
S. Qiu
Source :
Applied Physics Letters. 95:141906
Publication Year :
2009
Publisher :
AIP Publishing, 2009.

Abstract

We report on in situ neutron diffraction measurements during heating and cooling through the phase transformation in shape memory NiTi. The lattice plane specific strain evolution remains linear with temperature and is not influenced by intergranular stresses, enabling the determination of the thermal expansion tensor of B19′ NiTi. The neutron measurements are consistent with macroscopic dilatometric measurements and a 30 000 grain polycrystalline self-consistent model. The accommodative nature of B19′ NiTi results in macroscopic shape changes being offset (with temperature) from the start and finish of the transformation. The texture does not evolve in the absence of biasing stresses.

Details

ISSN :
10773118 and 00036951
Volume :
95
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........8dcde43835b93c47eee07000e6b16979
Full Text :
https://doi.org/10.1063/1.3245308