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Experimental investigation on transformation, reorientation and plasticity of Ni47Ti44Nb9SMA under biaxial thermal–mechanical loading
- Source :
- Smart Materials and Structures. 24:075025
- Publication Year :
- 2015
- Publisher :
- IOP Publishing, 2015.
-
Abstract
- The constitutive behavior of shape memory alloy (SMA) Ni47Ti44Nb9 specimens subjected to different thermal–mechanical loading histories was investigated experimentally. This involved the application of strain by different proportional or non-proportional paths in the biaxial −γ plane at −60 °C (Ms + 30 °C), the interaction between stress-induced martensitic transformation, reorientation and plastic deformation, temperature-induced reverse martensitic transformation and strain recovery. The results show that the equivalent stress–strain curves, as well as the pure shear and pure tensile curves, depend strongly on the thermal–mechanical loading history. For specimens deformed previously to the same equivalent strains by different paths, the equivalent recovery strains after unloading are similar, as are the spans between the reverse transformation start and final temperatures. The activated martensite variants depend strongly on loading history. The recovery of the axial strain component and that of the shear strain component due to reverse transformation occur synchronously and develop along the shortest path in the −γ plane. The results may provide some new and useful information on the effects of transformation, plasticity and loading paths for further studies and applications of such materials.
- Subjects :
- Materials science
Strain (chemistry)
business.industry
Shape-memory alloy
Structural engineering
Pure shear
Plasticity
Condensed Matter Physics
Atomic and Molecular Physics, and Optics
Mechanics of Materials
Martensite
Diffusionless transformation
Signal Processing
Ultimate tensile strength
Shear stress
General Materials Science
Electrical and Electronic Engineering
Composite material
business
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 1361665X and 09641726
- Volume :
- 24
- Database :
- OpenAIRE
- Journal :
- Smart Materials and Structures
- Accession number :
- edsair.doi...........3b1819f957de5e2a2986a68c119e49a5