KSEF RDE: The Damping and Cyclic Behavior of NiTiHfPd High Strength Shape Memory Alloys

Grants and Contracts Details


Shape memory alloys (SMAs) have the unique ability to recover large deformations upon heating or by removal of load. They have been used as actuators, sealing elements, couplers, stents, valves and surgical appliances in the biomedical, aerospace, oil-gas, automotive, robotics, and telecommunication industries. SMA based actuators have additional advantages over commercial pneumatic/hydraulic or motor driven systems such as higher energy density, compactness, lightweight, and silent operation. SMAs could also be employed as dampers in many industries such as aerospace (in aircraft engines to dampen the acoustic energy) and construction (in impact damping devices to counter seismic movements) due to their energy absorbing capabilities. Damping capacity is defined as the amount of energy that can be dissipated out of a system that may result in relief. Hence, good damping materials should have large mechanical hysteresis at high stress levels. NiTiHfPd alloys have very high strength (>2 GPa) and damping capacities in excess of 35 J/cm3 in polycrystalline form with huge stress hysteresis of 900 MPa. Although initial results are very promising, further work is necessary to determine its behavior under cyclic loading. In this proposal, the damping and cyclic stability responses of NiTiHfPd alloys will be investigated by a unique high force differential mechanical analyzer by compression and 3-point bending experiments. The effects of precipitation hardening on the damping and cyclic behavior will also be investigated to gain the ability to tailor its behavior for specific applications.
Effective start/end date7/1/156/30/17


  • KY Science and Technology Co Inc: $30,000.00


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