On the stress-assisted aging in NiTiHfPd single crystal shape memory alloys


ACAR E. , Tobe H., Karaca H., Chumlyakov Y.

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, cilt.725, ss.51-56, 2018 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 725
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.msea.2018.03.125
  • Dergi Adı: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
  • Sayfa Sayıları: ss.51-56

Özet

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.