Just add/create a new Material: http://help.autodesk.com/view/INVNTOR/2014/ENU/?co
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Please accept this as a solution if it answers your question.
Have a great weekend.
I don't want to spoil your fun, but modeling Nitinol is tremendously difficult. Typically this is done at the element level (e.g., in ABAQUS) because the material is non-linear and coupled in both strain and temperature, plus it's hysteretic and history-dependant; unless you're going to implement a material model somehow, I don't know what you hope to achieve. By order of magnitude you could assume the martensie phase behaves like copper and the austenite phase like aluminum; but again...you'd be using linear mechanics for a highly non-linear material and your results will be inacurate.
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