Stress-strain behaviors of <110>-oriented Tb_(0.3)Dy_(0.7)Fe_(1.95) after magnetic annealing

摘要

Compressive stress-strain behaviors in a <110>-oriented crystal Tb_(0.3)Dy_(0.7)Fe_(1.95) after magnetic annealing have been investigated under a series of quasi-static magnetic fields, attempting to add more insight into the corresponding domain-switching process. The magnetically annealed crystal outputs larger final strains than the untreated one, although it exhibits similar stress-strain behaviors. An obvious improvement also occurs in the initial Young's modulus E_0 after magnetic annealing. The corresponding domain switching processes under compressive stress have been discussed. Non-180° domain processes are favored because of the specific initial domain states, which can be reflected by the shortening of the flat stage in magnetostriction-magnetic induction (λ-B) curve and the increase of the critical field where maximum forced magnetostriction constant d_(33) locates.