It is shown that open-cell metallic foams having very low density, and that display martensite transformations required for shape memory and superelastic behavior, can be fabricated using a powder-metallurgy technique. Results are presented on experiments in which a polymeric precursor foam was coated with an equiatomic NiTi powder slurry and subsequently sintered to yield foams with relative densities as low as 0.039. Although contaminated with interstitial impurities, they displayed unambiguous calorimetric signature of the B2→B19′ transformation. The results are of considerable significance to potential applications requiring ultralightweight structures with the unusual dissipative and strain-recovery properties of NiTi shape-memory materials.
[1]
Yang-Tse Cheng,et al.
Recovery of microindents in a nickel-titanium shape-memory alloy: A self-healing effect
,
2002
.
[2]
L. Rong,et al.
An investigation of the synthesis of Ti-50 At. pct Ni alloys through combustion synthesis and conventional powder sintering
,
2000
.
[3]
S. Shabalovskaya,et al.
Mechanical properties and shape memory of porous nitinol
,
1994
.
[4]
M. Ashby,et al.
Metal Foams: A Design Guide
,
2000
.
[5]
C. M. Wayman,et al.
Shape-Memory Materials
,
2018
.
[6]
T. W. Duerig,et al.
Engineering Aspects of Shape Memory Alloys
,
1990
.