Please use this identifier to cite or link to this item: https://gnanaganga.inflibnet.ac.in:8443/jspui/handle/123456789/14854
Title: Elastic Property Dependence on Mobile and Trapped Hydrogen in Ni-201
Authors: S.K. Lawrence
B.P. Somerday
Keywords: hydrogen-material interactions
Mobile and Trapped Hydrogen in Ni-201.
Issue Date: 2017
Publisher: JOM
Abstract: Enhanced dislocation processes can accompany decohesion mechanisms dur-ing hydrogen degradation of ductile structural metals . However, hydrogen-deformation interactions and the role of defects in degradation processes re-main poorly understood. In the current study, nanoindentation within specifically oriented grains in as-received, hydrogen-charged, aged , and hydrogen are-charged conditions revealed a "hysteresis " of indentation modu-lus, while the indentation hardness varied minimally. Thermal pre-chargingwith 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 isnot solely responsible for mechanical property alterations; hydrogen trapped defects also contributes to elastic property variation.
URI: http://gnanaganga.inflibnet.ac.in:8080/jspui/handle/123456789/14854
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