Tailoring the Behavior of NiTiHf Alloys Fabricated by Conventional and Selective Laser Melting MethodsTuesday (15.05.2018) 12:45 - 13:30
NiTiHf alloys are very promising for high temperature shape memory applications. In this talk, an overview of the recent developments, challenges, opportunities and results on the conventional and additively manufactured NiTiHf alloys will be presented. The shape memory properties of NiTiHf alloys that are fabricated by conventional (induction melting) and selective laser melting method will be demonstrated and compared. The effects of composition, heat treatment, process parameters, stress state and texture/orientation on their transformation temperatures, microstructure and mechanical response will be discussed. These alloys can show superelasticity at temperatures above 100°C, shape memory effect under high stress levels (>1 GPa) and large damping capacity (>40 J.cm-3). It will be shown that shape memory properties of these alloys can easily be tailored by composition alteration, process parameters and heat treatments.