Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10620477 | Acta Materialia | 2012 | 10 Pages |
Abstract
Using the example of a Zr-Ti-Al-Cu-Ni bulk metallic glass with an ex situ approach, two aspects were studied: (i) the effects of pre-formed corrosion pits on the room temperature deformation behaviour, and (ii) the effect of mechanically generated defects on the local corrosion susceptibility. For the latter, Vickers micro-indents generated with different loads were also employed as model defects. It is revealed that pre-formed corrosion pits act as favourable surface sites to which shear bands are linked and most likely nucleate, which leads to a slight reduction in the maximum compression stress. Further, mechanically generated defects have to be considered as critical weak points at a glassy sample surface which can act as preferential sites for local corrosion initiation and propagation. Local chemical and structural changes due to the formation of shear bands as a response to mechanical load are discussed as possible reasons for this. For potential high-load applications of bulk metallic glasses this interaction must be considered as an important lifetime limiting aspect.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
A. Gebert, P.F. Gostin, M. Uhlemann, J. Eckert, L. Schultz,