FeMnSi based shape memory alloys for civil engineering applicationsThursday (17.05.2018) 15:25 - 15:50 Part of:
In recent years, FeMnSi based shape memory alloys (SMA) have attracted significant interest due to their potential use for civil engineering applications such as seismic damping, prestressing of concrete or joining applications. For the latter two applications high recovery stresses are desirable which form when a pre strained material is heated above the austenite start transformation temperature under constraint conditions. The present contribution investigates the role of precipitates, texture and grain size on the recovery stress in Fe–17Mn–5Si–10Cr–4Ni–1(V,C) (ma.-%). Modifying the density and size of VC-precipitates showed to be the most successful route to increase the recovery stress. By using precipitates and a comparably low heating temperature of 160°C, a recovery stress over 550MPa was achieved. High recovery stresses require the increase of the strength and the shape memory properties at the same time.