Phase Field Simulation of Ni4Ti3 Precipitation in Porous NiTi Shape Memory Alloys under Applied Stresses

Chang Bo Ke; Xiao Ma; Xin Ping Zhang

doi:10.4028/www.scientific.net/MSF.654-656.1504

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Numerical Characterization of Anisotropic Heat Sink Composites
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HomeMaterials Science ForumMaterials Science Forum Vols. 654-656Phase Field Simulation of Ni4Ti3 Precipitation in...

Phase Field Simulation of Ni₄Ti₃ Precipitation in Porous NiTi Shape Memory Alloys under Applied Stresses

Abstract:

This study presents the simulation of evolution of Ni4Ti3 variants during stress-assisted aging of NiTi alloys containing nano-scale pores with different sizes, by using phase field approach. The simulation shows that the higher level of applied stress can cause more Ni4Ti3 particles precipitated around pores than that of lower level stress, regardless of pore size; the large pores can “capture” more precipitates while less particles precipitated around the small pores. Moreover, the precipitation of Ni4Ti3 particles exhibits different regional preferences near pores, which means the unixial compressive stress can result in inhomogeneous Ni4Ti3 particle distribution.

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Periodical:

Materials Science Forum (Volumes 654-656)

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1504-1507

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https://doi.org/10.4028/www.scientific.net/MSF.654-656.1504

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Online since:

June 2010

Authors:

Chang Bo Ke, Xiao Ma, Xin Ping Zhang

Keywords:

Coherent Precipitate, Kinetic, Phase Field Modellig, Porous NiTi Shape Memory Alloy

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