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Evaluating the Room Temperature ECAP Processing of a NiTi Alloy via Simulation and Experiments
Author(s) -
Shahmir Hamed,
NiliAhmadabadi Mahmoud,
MansouriArani Mojtaba,
Khajezade Ali,
Langdon Terence G.
Publication year - 2015
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201400248
Subject(s) - materials science , nickel titanium , indentation hardness , pressing , alloy , metallurgy , finite element method , deformation (meteorology) , core (optical fiber) , composite material , shape memory alloy , microstructure , structural engineering , engineering
The NiTi alloys are generally considered hard‐to‐deform materials when processing by equal‐channel angular pressing (ECAP) at room temperature. Nevertheless, it is shown by experiment that a NiTi alloy may be successfully processed by ECAP for up to two passes using a core–sheath configuration. Three‐dimensional finite element simulations were used to more fully evaluate the flow behavior after the first and second pass of ECAP. The values of the microhardness were recorded across transverse directions within the cores and the results show that the imposed strain both decreases by comparison with the processing of conventional sheath‐free NiTi billet and increases by increasing the dimensions of the core. The lower areas of the cores undergo less deformation than the upper areas after successful ECAP processing but the imposed strain, and thus the microhardness values, become homogeneously distributed on the longitudinal planes after two passes of ECAP.