Shape-memory alloys are an engineer's dream ? materials that shape-shift spontaneously to accommodate changing operating conditions. Scientists from the National Aeronautics and Space Administration are studying the microstructure and micromechanics of SMAs using the VULCAN neutron diffractometer at the Spallation Neutron Source at Oak Ridge National Laboratory. Their goal is to create SMAs that will undergo a desired transformation/deformation precisely and reliably over thousands of cycles, said NASA's Othmane Benafan. SMAs could, for example, replace the existing airplane flap design, controlled by a heavy, complex hydraulic system, with SMA flaps that change position autonomously in response to temperature and air pressure, added Santo Padula. NASA plans to use the information gained at SNS to design reliable, high-temperature SMAs that can be manufactured commercially for many uses. The intensity of the SNS neutron beam and VULCAN's capability to test materials simultaneously under tension, compression and torsion offer unique capabilities for materials research. - Deborah Counce, 865.574.0644, May 02, 2012
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