Mechanical Properties of Highly Porous NiTi Alloys

被引：30

作者：

Bram, Martin ^{[1
]}

Koehl, Manuel ^{[1
]}

Buchkremer, Hans Peter ^{[1
]}

Stoever, Detlev ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst IEF 1, D-52425 Julich, Germany

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2011年 / 20卷 / 4-5期

关键词：

fatigue; mechanical properties; metal injection molding; porous NiTi; powder metallurgy; space-holder technique; SHAPE-MEMORY ALLOYS; BEHAVIOR; IMPLANTS; FABRICATION; REPLICATION; POROSITY;

D O I：

10.1007/s11665-011-9854-y

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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.

引用

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页码：522 / 528

页数：7

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