Journal Article

PreJuSER-15657

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Mechanical Properties of Highly Porous NiTi Alloys

Bram, M.FZJ* ; Köhl, M.FZJ* ; Buchkremer, H. P.FZJ* ; Stöver, D.FZJ*

2011
Springer New York, NY

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Please use a persistent id in citations: doi:10.1007/s11665-011-9854-y

Abstract: Highly porous NiTi alloys with pseudoelastic properties are attractive candidates for biomedical implants, energy absorbers, or damping elements. Recently, a new method was developed for net-shape manufacturing of such alloys combining metal injection molding with the application of suitable space-holder materials. A comprehensive study of mechanical properties was conducted on samples with a porosity of 51% and a pore size in the range of 300-500 mu m. At low deformations < 6%, fully pronounced pseudoelasticity was found. Even at higher strains, a shape recovery of maximum 6% took place, on which the onset of irreversible plastic deformation was superposed. Results of static compression tests were also used to calculate the energy-absorbing capacity. Fatigue of porous NiTi was investigated by cyclic loading up to 230,000 stress reversals. The failure mechanisms responsible for a reduction of shape recovery after an increased number of load cycles are discussed.

Keyword(s): J ; fatigue (auto) ; mechanical properties (auto) ; metal injection molding (auto) ; porous NiTi (auto) ; powder metallurgy (auto) ; space-holder technique (auto)

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellverfahren (IEK-1)

Research Program(s):

1. Rationelle Energieumwandlung (P12)

Appears in the scientific report 2011

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