EFFECT OF GRAIN BOUNDARIES ON THE ELECTRON WORK FUNCTION OF ULTRAFINE GRAINED ALUMINUM
EFFECT OF GRAIN BOUNDARIES ON THE ELECTRON WORK FUNCTION OF ULTRAFINE GRAINED ALUMINUM
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DOI：
10.1515/rams-2018-0053
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发表时间：
2018-01-01
影响因子：
3.6
通讯作者：
Resnina, N. N.
中科院分区：
文献类型：
--
作者：
Orlova, T. S.;Ankudinov, A., V;Resnina, N. N.
研究了高压扭转超细晶铝的电子功函数（EWF）。第一次得到了EWF对UFG Al晶界长度（或晶粒尺寸）的依赖关系。在90 ~ 400℃的不同温度下对hpt加工铝进行短期退火，得到了平均晶粒尺寸的变化。结果表明，晶界状态（GBs）影响EWF的大小。研究发现，在90℃退火下，在保持晶石比长和晶石平均错取向的情况下，晶石从非平衡态向平衡态转变，晶石平均比能降低0.3 J m（-2）。这种转变使UFG Al的EWF急剧增加0.25 eV。
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.