Journal of Materials Engineering and Performance

, Volume 20, Issue 4, pp 522-528

First online:

Mechanical Properties of Highly Porous NiTi Alloys

  • Martin BramAffiliated withForschungszentrum Jülich, Institute IEF-1 Email author 
  • , Manuel KöhlAffiliated withForschungszentrum Jülich, Institute IEF-1
  • , Hans Peter BuchkremerAffiliated withForschungszentrum Jülich, Institute IEF-1
  • , Detlev StöverAffiliated withForschungszentrum Jülich, Institute IEF-1

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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 μm. 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.


fatigue mechanical properties metal injection molding porous NiTi powder metallurgy space-holder technique