Near Surface Modification Affected By
Hydrogen/metal Interaction
Author(s)
Y. Katz, M. Tymiak & W. W. Gerberich
Abstract
Hydrogen/metal interaction represents a complex topic that attracted a high
volume of experimental/theoretical efforts. Thus, for better understanding, ample
activities have been conducted that spread over various levels and scales. The
current study emphasizes some additional facets manifested mainly by confined
and localized information. In this context, nano tests assisted by contact
mechanics methodology provided small volume information to be even stretched
to other surface related behaviour. This includes implications regarding the
quantification of sequential events as related to hydrogen embrittlment (HE) or
fracture processes transition. In addition, questions emerged regarding wear
aspects or tribological contacts insights. Basically, the study considered free
hydrogen (either external or internal) to be an aggressive environmental agent in
elastic–plastic crystalline solids. Experimentally based information has been
gathered in the bulk, supplemented also on the nano scale. In fact, this
comprehensive study with emphasis on the scale effects provided striking
insights. For example, in terms of contact tribological effects, normally
mechanical driving force is solely considered. However, here, the unique
contribution by environmental interaction includes phase stability effects and
localized plasticity. Mainly two materials have been focused: first, as a
background, AISI 316L metastable austenitic stainless steel, and secondly Ti/Cu,
thin film specimens affected by hydrogen. The outcoming effects have been
sorted out by mechanical response tracking and morphological visualization.
Quantitatively, it was assessed by nano indentation and continuous scratch tests.
Besides mechanical testing the information was supplemented by scanning Probe
Microscopy (SPM) observations. It became evident that hydrogen affected
dramatically the investigated systems with exploration of dislocation nucleation
and dynamics. As such, remarkable differences occurred on both plastic
localization and micro crack onset. In the thin layers the effective work of
adhesion was reduced, indicating significant degradation that could be expressed
quantitatively. Finally it was concluded that since fracture is a localized
phenomena nano scale information might suggest \“critical experiments” so vital
for fundamental concepts confirmation.
Keywords: hydrogen embrittlment, metastable austenitic stainless steel, nano
data, dislocation emission, wear.
Keywords
hydrogen embrittlment, metastable austenitic stainless steel, nano
data, dislocation emission, wear.
Related Book
Other papers in this volume
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