P. Kumar, D. C. lagoudas, Texas A & M University, College Station, TX; R. Noebe, NASA Glenn Research Center, Cleveland, OH
In this work, the influence of viscoplasticity on the transformation behavior of a HTSMA in this case, Ti50Pd40Ni10 is studied using thermomechanical testing and by transmission electron microscopy. For this purpose an ingot of the alloy is fab- ricated by vacuum arc melting, processed by hot rolling and cylindrical specimens for compression testing are cut from the rolled bar. Standard creep tests to deter- mine the creep behavior of the alloy and thermally induced phase transformation tests to observed the simultaneous viscoplastic and transformation behavior are con- ducted using a custom high temperature test setup. Thin sections are prepared from the as-received and test specimens for examining the microstructure by transmission electron microscopy. Based on the thermomechanical tests and the microstructural observations, the impact of transformation induced plasticity and viscoplasticity on
the actuation behavior of the HTSMA is discussed.
Summary: In this work, the influence of viscoplasticity on the transformation behavior of a HTSMA in this case, Ti50Pd40Ni10 is studied using thermomechanical testing and by transmission electron microscopy. For this purpose an ingot of the alloy is fabricated by vacuum arc melting, processed by hot rolling and cylindrical specimens for compression testing are cut from the rolled bar. Standard creep tests to deter- mine the creep behavior of the alloy and thermally induced phase transformation tests to observed the simultaneous viscoplastic and transformation behavior are conducted using a custom high temperature test setup. Thin sections are prepared from the as-received and test specimens for examining the microstructure by transmission electron microscopy. Based on the thermomechanical tests and the microstructural observations, the impact of transformation induced plasticity and viscoplasticity on
the actuation behavior of the HTSMA is discussed.
