Abstract
Ti50Ni49.7Mo0.3, Ti50Ni49.6Mo0.4 and Ti50Ni49.5Mo0.5 alloy fibers were prepared by a melt overflow process. Two-step B2-R-B19′ transformation was observed in the rapidly solidified Ti-Ni-Mo fibers. Upon increasing the Mo-content from 0.3 to 0.5at.%, the austenite transformation finish temperature (Af) of R→B2 decreased from 43 to −42°C. Porous shape memory alloy pellets with 75% porosity were fabricated by a vacuum sintering technology, using the alloy fibers. Mechanical properties and shape memory effect of the highly porous Ti50Ni49.6Mo0.4 alloy, of which Af is lower than room temperature, were investigated using a compressive test. The plateau of a stress-strain curve was observed at about 2MPa and resulted in 5% elongation associated with stress-induced martensitic transformation. It was also found that a recovered strain was 1.8% on heating after the compressive deformation. Because of the high porosity of this specimen, an elastic modulus of 0.91GPa could be obtained.
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