Authors: Mingdong Cai
Publish Date: 2012/02/09
Volume: 64, Issue: 1, Pages: 44-50
Abstract
In situ photoelectron emission in highpurity aluminum deformed under uniaxial tension while exposed to pulsed excimer laser radiation 248 nm is reported in this paper The effect of various surface treatments including polishing air oxidization carbon coating and gold coating on photoelectron emission was investigated The photoelectron emission signals are sensitive to straininduced surface structure changes such as slip lines and slip bands In the case of aluminum with oxide of 45 nm thickness the photoelectron emission increases gradually in a nonlinear fashion at the early stage of deformation strain ≤005 Then the photoemission grows linearly until the accumulated strain reaches about 017 In the final stage the photoelectron intensity increases parabolically until failure The transition of photoelectron emission from linear to parabolic growth correlates with the onset of strain localization The straininduced microstructural change was also analyzed by scanning electron microscopy SEM The photoelectron emission signals from aluminum during tension were interpreted in the light of surface treatment surface electron work function and surface microstructural change
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