The Effect of Co and Ge Addition on Shape Memory Effect of Shape Memory Alloy Fe-Mn-Si

Abstract

Fe-30Mn-5.5Si shape memory ally with added element of Co or Ge were fabricated. The transformation temperatures and shape recovery force of these specimens were measured. In Fe-(30-x)Mn-xCo-5.5Si(x=2∿15), reverse martnesitic transformation start and finish temperature, As and Af, increased with increase of Co content. Recovery force increased up to 2% of Co content and it was almost constant above 2% of Co content. In Fe-30Mn-(5.5-x)Si-xGe(x=0.5∿5), As decreased by Ge addition and shape recovery force decreased with increase of Ge content.