Journal
REVIEWS ON ADVANCED MATERIALS SCIENCE
Volume 57, Issue 1, Pages 110-115Publisher
INST PROBLEMS MECHANICAL ENGINEERING-RUSSIAN ACAD SCIENCES
DOI: 10.1515/rams-2018-0053
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Funding
- Ministry of Education and Science of the Russian Federation [3.3194.2017/4.6]
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The electron work function (EWF) of ultrafine grained (UFG) aluminum structured by high pressure torsion (HPT) has been investigated. For the first time, the dependence of the EWF on the specific length of grain boundaries (or the grain size) for UFG Al has been obtained. The change of average grain size was achieved by short term annealing of HPT-processed aluminum at different temperatures from the range 90-400 degrees C. It has been shown that the state of grain boundaries (GBs) affects the magnitude of the EWF. It has been found that the transformation of GBs due to annealing at 90 degrees C from a nonequilibrium to more equilibrium state while maintaining the specific length of GBs and their average misorientation is accompanied by a decrease in average GB specific energy by 0.3 J m(-2). This transition provides a sharp increase in the EWF of the UFG Al by 0.25 eV.
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