高/中エントロピー合金のFCC-HCP変態による高機能化

ー形状記憶効果と耐疲労性ー

抄録

FCC-HCP martensitic transformation is a known cause of transformation-induced plasticity in high manganese steels and shape memory effects in Fe-Mn-Si shape memory alloys. This paper describes the shape memory effect due to FCC-HCP martensitic transformation in Cr₂₀Mn₂₀Fe₂₀Co_40-xNi_x high-entropy alloys.Deformation behavior and low-cycle properties were investigated for Co51-xCr₂₃Mo₆Ni_x medium-entropy alloys. Alloys that underwent FCC-HCP martensitic transformation simultaneously with deformation twinning exhibited improved low-cycle fatigue life.