交流磁场对埃林瓦合金内耗及负ΔG效应的影响

Effect of AC Magnetic Field on Internal Friction and Negative AG Effect of Elinver Alloys

研究交流磁场对弥散硬化埃林瓦合金内耗 Q^(-1)和负 △G 效应的影响。结果表明:在交流磁场作用下,这种合金存在负 △G效应,而且与磁弹性效应密切相关。合金的内耗 Q^(-1)明显地取决于振动振幅 A,表明这种内耗主要来源于磁-力滞后损耗。在Q^(-1)-A 曲线上出现极小值是 γ′相质点对畴壁产生钉扎作用的结果。与直流磁场相比,交流磁场作用下的 H_((△G/G)min)小于直流磁场作用下的 H_((△G/G)min),但交流磁场作用下的|(△G/G)min|大于直流磁场作用下的|(△G/G)min|。

The effect of AC magnetic field on the internal friction and negative ΔG ef-fect in dispersion--hardening Elinver alloys were studied. The results showthat there exists a negative ΔG effect closely related to magnetic--elastic ef-fect in the alloy in AC magnetic-field. It is obvious that the internal frictionin alloy, Q^(-1),depends on the vibration amplitude A,i.e., the magnetic inter-nal friction mainly stems from magnetomechanical hysteresis internal friction.-The minimum value taking place on Q^(-1)-A curve is resulting from γ-phase particles which are nailed up on the domain wall. The H(ΔG/G)_(min) in ACmagnetic field is loss than that in DC magnetic field, but, on the contrary,I (ΔG/G)_(min)|in AC magnetic field is greater than that in DC magnetic field.