Abstract
The microstructural change in pure nickel was continuously observed with a high voltage electron microscope during electron-irradiation with applying external load at 723 K. Frank loops with diameter larger than 10 nm were observed to unfault during the irradiation under external stress. The unfaulting of the radiation-produced Frank loops, which nucleated without external load, was induced by the loading of resolved shear stress of 3.7 MPa or larger along unfaulting direction. The growth rate of the unfaulted loops was fairly larger than that of Frank loops. Unfaulted loops were observed to glide during irradiation under the external stress when they grew to exceed a certain critical size by climb.
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