Abstract
Impression creep was established as a reliable substitute for conventional creep testing using bulk specimens. Impression creep tests on succinonitrile crystals established the stress and temperature dependences which agreed with literature values. Conventional compression creep confirmed the results. From the computer program of impression creep using finite element method, the calculated impressing velocities agreed with experimental values. Such agreement established the impression creep condition in the power law creep regime and suggested a punch size dependence which was confirmed by experiment. In the observation of plastic zone in LiF after impression creep, dislocation etch pit techniques were used to reveal plastic zone size under the punch. It provided the experimental evidence and also confirmed the correlation between impression creep and conventional creep tests. Studies on hydrogen embrittlement and a review paper on solute defect interactions were completed. In the new mechanism of hydrogen embrittlement, a theoretical prediction of ductility can be achieved. (DLC)
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