Affordable Access

Publisher Website

Mechanical anisotropy of shape-memory NiTi with two-dimensional networks of micro-channels

Authors
Journal
Acta Materialia
1359-6454
Publisher
Elsevier
Publication Date
Volume
59
Issue
11
Identifiers
DOI: 10.1016/j.actamat.2011.04.007
Keywords
  • Porous Material
  • Nickel Titanium
  • Nitinol
  • Shape Memory
  • Space-Holder
Disciplines
  • Chemistry

Abstract

Abstract Ni–51.4 at.% Ti (Nitinol) containing 24 and 34 vol.% orthogonally interweaving micro-channels with 350–400 μm diameters was fabricated by a powder-metallurgy method. NiTi powder preforms containing steel wire meshes arranged in parallel layers were hot-pressed into NiTi/steel composites, from which the meshes were removed electrochemically, thereby producing micro-channels with tailorable morphology, fraction, and orientation. The compressive stiffness (15–35 GPa) and strength (420–780 MPa) can be controlled by the volume fraction and orientation of the micro-channels. Stiffness values are compared against analytical foam and composite models. A combination of elasticity, superelasticity, and the shape-memory effect allows for high strain recovery (93–95% of an applied compressive strain of 5%).

There are no comments yet on this publication. Be the first to share your thoughts.