TY - JOUR
T1 - Shape-memory NiTi-Nb foams
AU - Bansiddhi, Ampika
AU - Dunand, David C.
N1 - Funding Information:
This research was supported by the United States National Science Foundation (Grant DMR-0505772). A. Bansiddhi also gratefully acknowledges the support, through the Royal Thai Government Scholarship, of the Ministry of Science (Thailand).
PY - 2009/6
Y1 - 2009/6
N2 - A new powder metallurgy technique for creating porous NiTi is demonstrated, combining liquid phase sintering of prealloyed NiTi powders by Nb additions and pore creation by NaCl space-holders. The resulting foams exhibit well-densified NiTi-Nb walls surrounding interconnected pores created by the space-holder, with controlled fraction, size, and shape. Only small amounts of Nb (3 at.%) are needed to produce a eutectic liquid that considerably improves the otherwise poor densification of NiTi powders. NiTi-Nb foams with 34-44% porosity exhibit high compressive failure stress (>1,500 MPa), ductile behavior (>50% compressive strain), low stiffness (10-20 GPa), and large shape-memory recovery strains. These thermomechanical properties, together with the known biocompatibility of the alloy, make these open-cell foams attractive for bone implant applications.
AB - A new powder metallurgy technique for creating porous NiTi is demonstrated, combining liquid phase sintering of prealloyed NiTi powders by Nb additions and pore creation by NaCl space-holders. The resulting foams exhibit well-densified NiTi-Nb walls surrounding interconnected pores created by the space-holder, with controlled fraction, size, and shape. Only small amounts of Nb (3 at.%) are needed to produce a eutectic liquid that considerably improves the otherwise poor densification of NiTi powders. NiTi-Nb foams with 34-44% porosity exhibit high compressive failure stress (>1,500 MPa), ductile behavior (>50% compressive strain), low stiffness (10-20 GPa), and large shape-memory recovery strains. These thermomechanical properties, together with the known biocompatibility of the alloy, make these open-cell foams attractive for bone implant applications.
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U2 - 10.1557/jmr.2009.0256
DO - 10.1557/jmr.2009.0256
M3 - Article
AN - SCOPUS:68149141353
VL - 24
SP - 2107
EP - 2117
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 6
ER -