This title appears in the Scientific Report : 2013 

Powder metallurgical production of NiTi parts with fully expressed shape memory properties
Bram, Martin (Corresponding author)
Bitzer, Martin / Stöver, Detlev / Buchkremer, Hans Peter
Werkstoffsynthese und Herstellungsverfahren; IEK-1
Intermetallics, Kloster Banz (Germany), 2013-09-30 - 2013-10-04
Conference Presentation
ohne Topic
Within the last years, shape memory alloys based on NiTi gained increasing interest especially for biomedical applications and actuators. Powder metallurgy is an attractive production method which enables manufacturing of near-net-shaped NiTi components with complex geometries, while keeping material losses during processing at a minimum. As starting materials, pre-alloyed NiTi powders are favoured over elemental Ni and Ti powder mixtures if aiming on single-phased microstructures after sintering. In this work, P/M manufacturing of complex-shaped NiTi components with fully expressed shape memory properties is described in detail. Metal injection moulding (MIM) was preferentially used for net-shaping. Prototypes of biomedical foot staple and orthodontic brackets were produced to demonstrate potential of this technology for NiTi alloys. Optionally, functional macro porosity up to 50 vol. % was achieved by introduction of temporary space holder particles, which is quite promising e.g. for bone implants or damping applications. As reference, NiTi components free of pores were produced by hot isostatic pressing (HIP). The paper provides a detailed description of relationship between P/M processing conditions and resulting mechanical and shape memory properties.