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Lawrence, S.K.; Somerday, B.P.; Karnesky, R.A. |
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Elastic Property Dependence on Mobile and Trapped Hydrogen in Ni-201 |
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Journal Article |
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2017 |
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69 |
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1 |
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45-50 |
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Enhanced dislocation processes can accompany decohesion mechanisms during hydrogen degradation of ductile structural metals. However, hydrogen-deformation interactions and the role of defects in degradation processes remain poorly understood. In the current study, nanoindentation within specifically oriented grains in as-received, hydrogen-charged, aged, and hydrogen re-charged conditions revealed a “hysteresis” of indentation modulus, while the indentation hardness varied minimally. Thermal pre-charging with approximately 2000 appm hydrogen decreases the indentation modulus by 20%, aging leads to a slight recovery, but re-charging drives the modulus back down to values similar to those measured in the hydrogen-charged condition. This “hysteresis” indicates that dissolved interstitial hydrogen is not solely responsible for mechanical property alterations; hydrogen trapped at defects also contributes to elastic property variation. |
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1047-4838, 1543-1851 |
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NU @ karnesky @ lawrence_elastic_2017 |
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11516 |
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