Early stages of precipitation in Ni-rich near-equiatomic Ni-Ti shape memory alloys
Pseudoelastic NiTi-based shape memory alloys (SMA) of near-equiatomic composition are technologically very important for bio-medical applications. One of the methods of improving pseudoelasticity of this alloy is by low-temp. aging which is known to give rise to a very fine precipitates that evolve into Ni4Ti3 or Ni14Ti11 on prolonged exposure. However, very little is known about the early stages of this precipitation process. Small-angle neutron scattering (SANS) is especially suited to study these early stages in this system as Ni and Ti have scattering lengths of opposite signs and thus, offer extraordinarily large scattering contrast. The current study will explore the early stages of precipitations in Ni51Ti49 using SANS (at 300 C, both ex-situ & in-situ), in combination with 3D atom probe tomographic (3DAP) microscopy. Combination of these complementary techniques would provide valuable insight into early stages of precipitation and help design better pseudoelastic NiTi-based SMA for bio-medical applications.
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BISWAS Aniruddha; DEWHURST Charles; KRISHNAN Madangopal; SARKAR Sudip Kumar; SEN DEBASIS and WIEDENMANN Albrecht. (2013). Early stages of precipitation in Ni-rich near-equiatomic Ni-Ti shape memory alloys. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.1-01-132
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