Characterization of Localized Surface States of Al 7075-T6 during Deposition of Cerium-Based Conversion Coatings

2010 ◽  
Vol 157 (8) ◽  
pp. C282 ◽  
Author(s):  
Becky L. Treu ◽  
Simon Joshi ◽  
William R. Pinc ◽  
Matthew J. O’Keefe ◽  
William G. Fahrenholtz
Keyword(s):  
Surface States ◽  
Conversion Coatings ◽  
Al 7075

Characterization of Cerium-Based Conversion Coatings on Al 7075-T6 Deposited from Chloride and Nitrate Salt Solutions

2011 ◽  
Vol 158 (3) ◽  
pp. C88 ◽  
Author(s):  
Simon Joshi ◽  
Becky L. Treu ◽  
Matthew J. O’Keefe ◽  
William G. Fahrenholtz
Keyword(s):  
Nitrate Salt ◽  
Conversion Coatings ◽  
Salt Solutions ◽  
Al 7075

Characterization of surface states on patrimonial works of art

2001 ◽  
Vol 98 (9) ◽  
pp. 777-782 ◽  
Author(s):  
M. Elias ◽  
M. Menu
Keyword(s):  
Surface States ◽  
Works Of Art

Characterization of Different Surface States and Its Effects on the Oxidation Behaviours of Alloy 690TT

2012 ◽  
Vol 28 (4) ◽  
pp. 353-361 ◽  
Author(s):  
Zhiming Zhang ◽  
Jianqiu Wang ◽  
En-Hou Han ◽  
Wei Ke
Keyword(s):  
Surface States

Influence of surface passivation on electric properties of individual GaAs nanowires studied by current–voltage AFM measurements

2016 ◽  
Vol 56 (2) ◽  
Author(s):  
Pavel Geydt ◽  
Prokhor A. Alekseev ◽  
Mikhail S. Dunaevskiy ◽  
Tuomas Haggrén ◽  
Joona-Pekko Kakko ◽  
...  
Keyword(s):  
Vertical Structure ◽  
Surface Passivation ◽  
Surface States ◽  
Electric Properties ◽  
Conductive Atomic Force Microscopy ◽  
Force Microscopy ◽  
Atomic Force ◽  
Gaas Nanowires ◽  
Current Voltage

Current–voltage (I–V) characteristics of vertical p-GaAs nanowires (NWs) covered by different surface passivation materials were experimentally measured by conductive atomic force microscopy (C-AFM). The obtained I–V curves for individual NWs with a diameter of 100 nm covered with AlGaAs, GaN, GaP or InP shell layers were compared to analyse the influence of surface passivation on the density of surface states and choose the most beneficial passivating material for technological applications. We have found the absence of a Schottky barrier between the golden catalytic cap on the top of a NW and the nanowire situated below and covered with an ultrathin GaP passivating layer. It was suggested that passivating material can arrange the heterostructure configuration with the GaAs NW near the Au cap. The latter mechanism was proposed to explain a strong energy barrier found in nanowires covered with InP passivation. AlGaAs passivation affected the forward threshold voltage of nanowires for NWs, which was measured simultaneously with the resistivity of each individual vertical structure from an array by means of AFM in the regime of measuring the I–V curves and onefold calculations. We made an attempt to develop the methodology of measurement and characterization of electric properties of passivated NWs.

scholarly journals A Comparative Investigation on Conventional and Stationary Shoulder Friction Stir Welding of Al-7075 Butt-Lap Structure

Metals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1264 ◽  
Author(s):  
Yu Chen ◽  
Huaying Li ◽  
Xiaoyu Wang ◽  
Hua Ding ◽  
Fenghe Zhang
Keyword(s):  
Friction Stir Welding ◽  
Material Flow ◽  
Comparative Investigation ◽  
Flow Mode ◽  
Nugget Zone ◽  
Friction Stir ◽  
Stationary Shoulder ◽  
Average Grain Size ◽  
Al 7075

Both conventional friction stir welding (C-FSW) and stationary shoulder friction stir welding (S-FSW) were employed to join the Al-7075 butt-lap structure, then the microstructural evolution and mechanical characterization of all FSW joints were systematically studied. The C-FSW joint exhibited a rough surface with flashes and arc corrugations, while the surface of the S-FSW joint became smooth. Moreover, for the S-FSW joint, the shoulder-affected zone got eliminated and the material flow mode during FSW was changed owning to the application of stationary shoulder. Furthermore, in comparison to C-FSW, the lower welding heat input of S-FSW decreased the average grain size in the nugget zone and inhibited the coarsening of strengthening precipitates in the heat-affected zone, elevating the overall hardness for the S-FSW joint. In addition, the tensile strength of the S-FSW joint became higher compared to the C-FSW joint, and all the FSW joints failed inside the nugget zone attributing to the existence of hook defect. The sharp-angled hook defect deteriorated the plasticity of the C-FSW joint further, which was only 70% that of the S-FSW joint.

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