对(Tb,Dy)Fe2超磁致伸缩合金，用微分相衬显微镜原位研究了应力和磁场引起的畴变，卸载压痕裂纹在湿空气中的滞后扩展以及在湿空气中恒磁场引起的滞后畴变及滞后开裂。结果表明，残余应力能使压痕裂纹在湿空气中发生滞后扩展；当磁场大于门槛值Hth后就能使压痕裂纹发生瞬时扩展；在湿空气中恒磁场（H In situ observation of delayed propagation of unloaded indentation crack in humid air, as well as delayed domain change and delayed cracking induced by constant magnetic field in humid air for (Tb,Dy)Fe2 magnetostrictive alloy have been investigated using differential inference contrast microscope. The results showed that a residual stress during indenting could cause delayed propagation of unloaded indentation crack in humid air. A magnetic field exceeded a threshold field Hth caused instant propagation of indentation crack. A constant magnetic field below Hth could cause delayed change of domain configuration in humid air and delayed propagation of indentation crack in humid air.
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