Hydrogen effect on creep of the ultrafinegrained zirconium alloy OF Zr-Nb system
| Parent link: | Metal-Hydrogen Systems (MH2016).— 2016.— [P. 58] |
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| Summary: | Title screen Formation of ultrafine-grained structure in pure zirconium and zirconium-based alloys by methods ofsevere plastic deformation allows for improving the strength characteristics of the materials by a factor of two orthree. However, the hydrogen absorption rate by polycrystalline metals is known to increase with reduction ingrain size. Under operating conditions, hydrogen dissolved in zirconium alloys initiate failure of structuresproduced from these materials, even though the hydrogen concentration is below a maximum permissible level.This is due to high diffusive mobility of hydrogen in metals which provides its redistribution over the metalvolume on exposure to elastic stress fields. As a result hydrogen clusters are formed in the regions subjected tothe highest stresses thus increasing the probability of hydride precipitation and pore and crack formation there.Hydrogen embrittlement of metals associated with hydrogen redistribution in stress fields develops at low strainrates characteristic of creep. Hydrogen embrittlement caused by induced decomposition of supersaturated solidhydrogen solution in metals is also observed at low strain rates to form hydrides. |
| Language: | English |
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2016
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| Online Access: | https://mh2016.ch/wp-content/uploads/programm/all_abstracts_mh2016.pdf#page=58 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=651766 |