Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7963201 | Journal of Nuclear Materials | 2018 | 18 Pages |
Abstract
The nonmagnetic austenite steels are the jacket materials for low-temperature superconductors of fusion reactors. The present work provides evidences that austenites transform to magnetic martensite when deformation with a high-strain is imposed at 77â¯K and 4.2â¯K. The 4.2â¯K test is characterized by serrated yielding that is related to the specific motion of dislocations and phase transformations. The in-situ transmission electron microscope (TEM) observations in nanoscale reveal that austenites achieve deformation by twinning under low-strain conditions at deep cryogenic temperatures. The generations of twins, martensitic transformations, and serrated yielding are in order of increasing difficulty.
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Authors
Wentuo Han, Yuchen Liu, Farong Wan, Pingping Liu, Xiaoou Yi, Qian Zhan, Daniel Morrall, Somei Ohnuki,