Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 725, Issue -, Pages 51-56Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.03.125
Keywords
Shape memory; Martensitic transformation; Stress-assisted aging; NiTiHfPd; High strength SMAs
Categories
Funding
- NASA Fundamental Aeronautics Program
- NASA EPSCOR program [NNX11AQ31A]
- NSF [CMMI-1538665]
- RFBR [10-03-0154-a]
- Aeronautical Sciences Project
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The effects of aging under compressive stress of 300 MPa on the shape memory properties and microstructure of [(1)over-bar 17] -oriented Ni45.3Ti29.7Hf20Pd5 single crystals were studied. It was revealed that stress-assisted aging resulted in 4 variants of the H-precipitates in contrast to 6 variants observed after stress-free aging. It was revealed that precipitate properties and martensite morphologies strongly depend on aging conditions. As a consequence of the aligned precipitates and generated internal stress, two-way shape memory effect (with up to 0.55-0.8% strain) and higher recoverable strains were observed in Ni45.3Ti29.7Hf20Pd5 single crystals after stress-assisted aging.
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