The shape memory effect in antiferromagnetic alloys, pp. 287-315
Authors: H. Zhang
Abstract: There are shape memory effect (SME) in Mn-based antiferromagnetic alloys same as MnCu, MnNi and MnFe etc. There exist both antiferromagnetic transition (AT) and martensitic transformation (MT) in the alloys. The MT with thermoelastic effect is following AT. When Ms of MT temperature is close to TN of AT each other, the coupling of transformation between MT and AT is formed, which resulted in hysteresis-free characteristics of two-way SME associated with temperature. There also are magnetic field induced strain (MFIS) and magnetic shape memory effect (MSME) in the antiferromagnetic alloys. Twin boundaries of fct martensitie and walls of antiferromagnetic domain are consistent in the alloys. With the help of movement of (011) twin boundaries in fct martensite, the reorientation of martensite is produced and a larger MFIS is obtained under an applied field and showed SME property.