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Stress Effects in Laser‐Pulsed Chromium Films Tracked by Nanosecond Transmission Electron Microscopy
Author(s) -
Dömer H.,
Bostanjoglo O.
Publication year - 2002
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/1527-2648(20020806)4:8<623::aid-adem623>3.0.co;2-m
Subject(s) - materials science , chromium , laser , transmission electron microscopy , nanosecond , brittleness , laser ablation , phase transition , stress (linguistics) , metallurgy , optics , composite material , optoelectronics , nanotechnology , condensed matter physics , linguistics , philosophy , physics
The application of laser treatment is rapidly expanding, and understanding the decisive processes is a must. Laser‐patterned chromium films show a damage very much different from that in other metals. High‐speed electron microscopy and selected area diffraction disclosed a new ablation mechanism based on travelling stress waves, and launched by a fast first order solid state transition during heat‐up and cool‐down. A brittle‐to‐ductile phase transition, thermal expansion and thermocapillarity, the currently assumed mechanisms for laser‐induced damage in chromium films, actually are not decisive.