Abstract
The incubation period during erosion of 1100 Al has been studied by monitoring the changes occurring in the immediate subsurface layers using a mechanical properties microprobe. The results show that the very near surface regions reach maximum hardness well before steady state, concurrent with the development of a characteristic surface ripple structure. This is interpreted as support for models of material removal in steady state based on some form of critical strain criteria rather than a fracture flow stress. It is also observed that material under valleys in the ripple structure is hardened to shallower depths. The significance of this result is not yet clear but appears to be linked to the development of the ripple structure.
Original language | English |
---|---|
Pages (from-to) | 1475-1480 |
Number of pages | 6 |
Journal | Scripta Metallurgica |
Volume | 23 |
Issue number | 9 |
DOIs | |
State | Published - Sep 1989 |
Funding
The authors would like to thank A. V. Levy at Lawrence Berkeley Laboratories for performing the erosion tests. This research was sponsored by the U.S. Department of Energy AR&TD Fossil Energy Materials Program under contract DE-AC05-840R21400 with Martin Marietta Energy Systems, Inc. One of the authors (MR) was supported by an appointment to the U.S. Department of Energy Laboratory Cooperative Postgraduate Research Training Program administered by Oak Ridge Associated Universities.