Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 31, Pages 28043-28051Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b08145
Keywords
Ti3Sn/NiTi; syntactic foam; strength; damping capacity; melt infiltration
Funding
- National Natural Science Foundation of China [51571090]
- Training Program of Major Basic Research Project of Provincial Natural Science Foundation of Guangdong [2017B030308001]
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NiTi shape-memory alloy foams have attracted much attention due to their unique superelasticity, excellent mechanical properties, and damping capacities, but their high-temperature damping capacity and compressive strength remain to be a challenge. Herein, we demonstrate the preparation of Ti3Sn-NiTi syntactic foams using Ti58Ni34Sn8 alloy and alumina microspheres by novel pressure melt infiltration and air-cooling strategies. The syntactic foams with 45% porosity contain spherical and well-distributed pores of average size 500-600 mu m. A fine lamellar Ti3Sn/NiTi eutectic with an interspacing distance of 600-900 nm and a Ti2Ni interfacial layer of 10 mu m thickness were formed between the alumina microspheres and the matrix. The syntactic foams achieved a high specific compressive strength (110.2-110.8 MPa cm(3)/g) at a wide temperature range because of the large interfacial area and good lattice strain matching in the lamellar Ti3Sn/NiTi. They also exhibited 2% recoverable strain and high specific energy absorption capacity (31.5 kJ/kg). Moreover, the showed ultrahigh damping capacity (0.066) at a temperature range of -150 to 200 degrees C. Most interestingly, the Ti3Sn-NiTi syntactic foams showed the highest comprehensive coefficient, (sigma/rho).tan delta, of 5.07 to date. Because of these impressive features, Ti3Sn-NiTi syntactic foams become a promising material for energy absorption and damping applications.
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